Micronutrients
The advice below comes from each crop's guide — every item shows its source, region and date. It is pending expert review; ask your local officer whether it suits your area.
Crops with advice (45)
Tap a crop to open its advice.
Maize1 recommendations
Full guide for this crop →Zinc and iron In zinc-deficient soils, apply zinc sulphate at 37.5 kg/ha for hybrid maize and 25 kg/ha for varieties. For zinc and iron deficiency seen in plants, spray 0.5% ZnSO4, or 1% FeSO4 + 0.1% citric acid, three times on the 30th, 40th and 50th day after sowing. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Maize (irrigated) – Application of micronutrient, p. 107
- Region
Tamil Nadu - Last updated
- 2026-11-04
Jowar1 recommendations
Full guide for this crop →Zinc and iron deficiency signs Zinc: symptoms first appear in newly formed leaves at 20–30 days; older leaves show yellow streaks or striping between the veins. Iron: yellowing between the veins (interveinal chlorosis) in newly formed leaves; if it continues, the whole leaf turns pale and the crop can look bleached, dry up and die. For iron deficiency in a direct-sown crop, spray 1% FeSO4 + 0.1% citric acid three times when symptoms appear. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Sorghum – Deficiency symptoms, p. 71
- Region
Tamil Nadu - Last updated
- 2026-11-04
Groundnut1 recommendations
Full guide for this crop →Zinc and iron deficiency Zinc deficiency: apply 25 kg ZnSO4 per hectare as basal (reduce to 12.5 kg if 12.5 t FYM per hectare is applied). Iron deficiency: spray 1% FeSO4 + 0.1% citric acid three times, on the 30th, 40th and 50th day after sowing. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Groundnut (rainfed) – Nutritional disorder, p. 186
- Region
Tamil Nadu - Last updated
- 2026-11-04
Chilli2 recommendations
Full guide for this crop →Manures and fertilizers Varieties: FYM 25 t/ha and NPK 30:60:30 kg/ha as basal; top-dress 30 kg N/ha in equal splits on the 30th, 60th and 90th day after planting. Hybrids: FYM 30 t/ha and NPK 30:80:80 kg/ha as basal; top-dress 90 kg N/ha in equal splits on the 30th, 60th and 90th day. Applying potassium as potassium sulphate (K2SO4) improves chilli quality. Apply borax at 12.5 kg/ha in boron-deficient soils. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Chilli – Manuring, pp. 74–75
- Region
Tamil Nadu - Last updated
- 2026-11-04
Key operations by stage (from the source) 30th, 60th and 90th day after planting: nitrogen top dressing in equal splits. From the 40th day: spray 0.5% zinc sulphate three times at 10-day intervals. 60th and 90th day: spray NAA at 10 ppm (10 mg per litre of water) to increase fruit set. Follow the instructions on the product label. Consult your local Agriculture Officer before use. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Chilli – Manuring, growth regulators & micronutrient spray, pp. 74–75
- Region
Tamil Nadu - Last updated
- 2026-11-04
Tomato2 recommendations
Full guide for this crop →Manures and fertilizers Varieties: FYM 25 t/ha and NPK 75:100:50 kg/ha, with borax 10 kg and zinc sulphate 50 kg/ha as basal; top-dress 75 kg N/ha on the 30th day after planting or at earthing up. Hybrids: FYM 25 t/ha and NPK 50:250:100 kg/ha, with borax 10 kg, zinc sulphate 50 kg and copper sulphate 3.75 kg/ha as basal; top-dress N and K, 150 kg/ha each, in 3 equal splits at 30, 45 and 60 days after planting. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Tomato – Manuring, pp. 58–59
- Region
Tamil Nadu - Last updated
- 2026-11-04
Key operations by stage (from the source) 3rd day after planting: life irrigation. 30th day: top dressing of nitrogen (varieties) or the first split (hybrids); stake hybrid plants with 1–1.5 m stakes and remove side branches up to 20 cm from the ground. 30 days: one hand weeding after pre-emergence herbicide. From 40 days: spray 0.5% zinc sulphate three times at 10-day intervals. Flowering: spray 0.3% boric acid, and again 10 days later. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Tomato – Field preparation, manuring, training & micronutrient spray, pp. 58–60
- Region
Tamil Nadu - Last updated
- 2026-11-04
Marigold1 recommendations
Full guide for this crop →Micronutrient sprays (precision production) Spray FeSO4 0.5% + ZnSO4 0.5% on the 30th and 45th day after transplanting. Humic acid at 0.2% is also sprayed on the 30th and 45th day. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Marigold (precision) – Micronutrients & biostimulants, p. 258
- Region
Tamil Nadu - Last updated
- 2026-11-04
Wheat1 recommendations
Full guide for this crop →Fertilizer If a soil test is not available, apply 80:40:40 kg NPK per hectare. Apply half the N and all the P and K basally, placed in the sowing line; top-dress the remaining half of N at crown root initiation (15–20 days after sowing). For soils deficient in zinc and sulphur, apply 37.5 kg ZnSO4 and 40 kg S per hectare basally. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Wheat – Application of fertilizers; top dressing, pp. 122–123
- Region
Tamil Nadu - Last updated
- 2026-11-04
Pearl millet1 recommendations
Full guide for this crop →Fertilizer If a soil test is not available, apply 70:35:35 kg N, P2O5, K2O per hectare for varieties and 80:40:40 kg for hybrids. Apply all P and K basally; split N as 25% at sowing, 50% at 15 days and 25% at 30 days, and irrigate after top dressing. For rainfed conditions, Azospirillum and phosphobacteria (or Azophos) with 75% of the recommended N and P is recommended. Apply 30 kg S basally in sulphur-deficient soils. If micronutrient mixture is not available, apply 25 kg zinc sulphate per hectare. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Cumbu – Application of fertilizers; top dressing, pp. 84–86
- Region
Tamil Nadu - Last updated
- 2026-11-04
Finger millet1 recommendations
Full guide for this crop →Fertilizer If a soil test is not available, apply 60 kg N, 30 kg P2O5 and 30 kg K2O per hectare. Apply half the N and all the P basally; apply the remaining N in two equal splits at 25–30 and 40–45 days after sowing. Before transplanting, apply 2000 g each of Azospirillum and phosphobacteria (or 4000 g Azophos) mixed with 25 kg soil and 25 kg FYM. For zinc deficiency in plants, spray 0.5% ZnSO4 on the 30th, 40th and 50th day. In rainfed ragi, Azospirillum mixed with FYM saves about 50% of the nitrogen cost. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Ragi – Application of fertilizers & micronutrients, pp. 94–95
- Region
Tamil Nadu - Last updated
- 2026-11-04
Green gram2 recommendations
Full guide for this crop →Fertilizer (when soil test is not done) Apply fertilizers basally before sowing. Rainfed: 12.5 kg N + 25 kg P2O5 + 12.5 kg K2O + 20 kg S per hectare. Irrigated: 25 kg N + 50 kg P2O5 + 25 kg K2O + 40 kg S per hectare. Sulphur is applied as gypsum if single super phosphate is not used. Under irrigation, also apply 25 kg ZnSO4 per hectare. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Greengram – Fertilizer application, pp. 146–147
- Region
Tamil Nadu - Last updated
- 2026-11-04
Root rot Apply zinc sulphate at 25 kg/ha and neem cake at 150 kg/ha basally. Apply Pseudomonas fluorescens or Trichoderma asperellum at 2.5 kg/ha with 50 kg of well-decomposed FYM or sand to the soil at 30 days after sowing. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Greengram – Disease management (Root rot), p. 150
- Region
Tamil Nadu - Last updated
- 2026-11-04
Black gram2 recommendations
Full guide for this crop →Fertilizer (when soil test is not done) Apply fertilizers basally before sowing. Rainfed: 12.5 kg N + 25 kg P2O5 + 12.5 kg K2O + 20 kg S per hectare. Irrigated: 25 kg N + 50 kg P2O5 + 25 kg K2O + 40 kg S per hectare (sulphur as gypsum if single super phosphate is not used). Under irrigation, also apply 25 kg ZnSO4 per hectare. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Blackgram – Fertilizer application, pp. 137–138
- Region
Tamil Nadu - Last updated
- 2026-11-04
Foliar sprays Spray 1% urea on the 30th and 45th day after sowing for yield improvement. If plants show deficiency symptoms, spray 0.5% ZnSO4, or 1% FeSO4 + 0.1% citric acid, on the 30th and 45th day. During a dry spell in the rabi season, a spray of 2% KCl + 100 ppm boric acid is recommended. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Blackgram – Foliar spray & dry-spell management, p. 138
- Region
Tamil Nadu - Last updated
- 2026-11-04
Horse gram1 recommendations
Full guide for this crop →Manure, fertilizer and weeding Apply 12.5 t/ha of FYM or compost, and 12.5 kg N, 25 kg P and 12.5 kg K per hectare as basal if the soil is deficient. If the soil is deficient in zinc and iron, apply 25 kg ZnSO4 and 25 kg FeSO4 with FYM. Give one weeding and hoeing 25–30 days after sowing. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Horsegram – Fertilizer recommendation; weed management, p. 159
- Region
Tamil Nadu - Last updated
- 2026-11-04
Cowpea1 recommendations
Full guide for this crop →Fertilizer Apply fertilizers basally before sowing. Rainfed: 12.5 kg N + 25 kg P2O5 + 12.5 kg K2O + 10 kg S per hectare. Irrigated: 25 kg N + 50 kg P2O5 + 25 kg K2O + 20 kg S per hectare. Under irrigation, apply 25 kg ZnSO4 per hectare with 50 kg FYM or sand. If the soil is deficient, 10 kg borax and 0.25 kg ammonium molybdate can be applied. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Cowpea – Fertilizer application, p. 154
- Region
Tamil Nadu - Last updated
- 2026-11-04
Field bean1 recommendations
Full guide for this crop →Fertilizer Apply 20 kg N, 80 kg P2O5, 40 kg K2O and 40 kg S (as 220 kg gypsum) per hectare as basal. Under irrigation, if the soil is deficient, apply 25 kg ZnSO4, 10 kg borax and 25 kg FeSO4 with FYM. A spray of DAP or urea at 20 g per litre at flowering and again 15 days later increases flower number and pod set. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Field lab-lab – Fertilizer & foliar application, p. 172
- Region
Tamil Nadu - Last updated
- 2026-11-04
Sesame1 recommendations
Full guide for this crop →Manganese and zinc deficiency Manganese deficiency: yellowing between the veins, later light brown dead patches — mix 10 kg MnSO4 per hectare with 45 kg of soil and broadcast on the beds after sowing. Zinc deficiency: middle leaves yellow between the veins with dead tissue along the leaf tips — apply 25 kg zinc sulphate with 45 kg of soil after sowing. Do not work the micronutrient into the soil. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Sesame – Nutritional disorders, p. 200
- Region
Tamil Nadu - Last updated
- 2026-11-04
Sunflower3 recommendations
Full guide for this crop →Seed treatment For rainfed sowing, soak seeds in 2% ZnSO4 for 12 hours and shade-dry. Treat seed with Trichoderma at 4 g/kg just before sowing (do not also use fungicides). Treat the seed for one hectare with 600 g each of Azospirillum and phosphobacteria (or 600 g Azophos) using rice gruel, shade-dry for 30 minutes and sow immediately. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Sunflower – Seed treatment, p. 218
- Region
Tamil Nadu - Last updated
- 2026-11-04
Biofertilizers, sulphur and micronutrients Before sowing, apply 2000 g each of Azospirillum and phosphobacteria (or 4000 g Azophos) mixed with 25 kg FYM and 25 kg soil. Apply sulphur at 20 kg/ha through ammonium sulphate or single super phosphate, or gypsum at 200 kg/ha as basal. For zinc deficiency, apply 25 kg ZnSO4/ha as basal or spray 0.5% ZnSO4 on the 30th, 40th and 50th day. For boron-deficient soils, apply 10 kg borax per hectare. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Sunflower – Biofertilizer, micronutrients & sulphur, pp. 217–219
- Region
Tamil Nadu - Last updated
- 2026-11-04
Better seed set at flowering At ray floret opening, spray boric acid 0.2% (2 g per litre) on the flower head to improve seed set and filling. In the mid-flowering phase (58–60 days for long-duration and 45–48 days for short-duration varieties), improve pollination between 9 and 11 a.m. by gently rubbing the flower heads with a hand covered in soft cloth, or rubbing two flowers face to face. Keeping 5 bee hives per hectare also improves seed setting. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Sunflower – Boric acid; improving seed set, p. 219
- Region
Tamil Nadu - Last updated
- 2026-11-04
Soybean2 recommendations
Full guide for this crop →Seed treatment Treat seed with talc formulation of Trichoderma viride at 4 g/kg or Pseudomonas fluorescens at 10 g/kg, then with Rhizobium. At least 24 hours before sowing, treat the seed for one hectare with 3 packets (600 g) of Rhizobium and 3 packets (600 g) of phosphobacteria using rice kanji, and shade-dry for 15 minutes. Coating seed with ZnSO4 at 300 mg/kg (using 10% maida solution as adhesive) increases field stand. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Soyabean – Seed treatment with biofertilizer; zinc coating, pp. 174–175
- Region
Tamil Nadu - Last updated
- 2026-11-04
Fertilizer Irrigated: apply 20 kg N, 80 kg P2O5, 40 kg K2O and 40 kg S (as 220 kg gypsum) per hectare as basal; if the soil is deficient, also 25 kg ZnSO4 and 25 kg MnSO4 per hectare. Rainfed (if soil test is not available and moisture is adequate): 20:40:20:20 kg NPKS per hectare, all basal. A spray of DAP or urea at 20 g per litre at flowering and again 15 days later is listed. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Soyabean – Fertilizer application (irrigated, p. 175; rainfed, p. 176)
- Region
Tamil Nadu - Last updated
- 2026-11-04
Brinjal1 recommendations
Full guide for this crop →Manure, fertilizer and irrigation Varieties: FYM 25 t/ha and NPK 50:50:30 kg/ha basal; 50 kg N/ha on the 30th day or at earthing up. Hybrids: FYM 25 t/ha and NPK 100:150:100 kg/ha basal; 100 kg N/ha on the 30th day. Do hand weeding, top dressing and earthing up on the 30th day. After the seedlings establish, irrigate at weekly intervals. If zinc deficiency is seen, spray 0.5% zinc sulphate three times at 10-day intervals. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Brinjal – Manuring; irrigation; after cultivation, pp. 64–66
- Region
Tamil Nadu - Last updated
- 2026-11-04
Onion1 recommendations
Full guide for this crop →Irrigation and fertilizer Irrigate at planting, on the third day, and then at weekly intervals. Basal: FYM 25 t/ha, Azospirillum 2 kg and phosphobacteria 2 kg/ha, N 50 kg, P 150 kg and K 75 kg/ha, and zinc sulphate 50 kg/ha at the last ploughing. Top-dress 50 kg N/ha 30 days after planting. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Big onion – Irrigation; application of fertilizers, p. 151
- Region
Tamil Nadu - Last updated
- 2026-11-04
Cabbage1 recommendations
Full guide for this crop →Seed and nursery Seed rate: 650 g/ha (250 g/ha for hybrids raised in protrays). Treat seed in hot water at 50 °C for 30 minutes; 25 g Azospirillum treats 250 g of seed. Nursery: 100 m² per hectare, with 300 kg FYM, 10 kg of 9:9:9 mixture, 50 g sodium molybdate and 100 g borax. Sow in rows 10 cm apart on raised beds. Seedlings are ready in 40–45 days (about 25 days in protrays). Avoid land with club root disease. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Cabbage – Seed rate; nursery; seed treatment, p. 119
- Region
Tamil Nadu - Last updated
- 2026-11-04
Cauliflower3 recommendations
Full guide for this crop →Seed and nursery Seed rate: 375 g/ha (250 g/ha for hybrids in protrays). Treat seed in hot water at 50 °C for 30 minutes; 25 g Azospirillum treats 250 g of seed. Nursery: 100 m² per hectare with 300 kg FYM, 10 kg of 9:9:9 mixture, 50 g sodium molybdate and 100 g borax; sow in rows 10 cm apart on raised beds. Transplant 25-day-old (early varieties) or 45-day-old (late varieties) seedlings. Avoid land with club root disease. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Cauliflower – Nursery; seed rate; seed treatment, pp. 124–125
- Region
Tamil Nadu - Last updated
- 2026-11-04
Irrigation and fertilizer Irrigate once a week. Plains: basal FYM 15 t/ha and N 50, P 100, K 50 kg/ha; 50 kg N after 45 days; apply 2 kg of vegetable micronutrient mixture separately from the fertilizers. Hills: FYM 30 t/ha and NPK 90:90:90 kg/ha basal, then 45:45:45 kg/ha after 45 days. Micronutrients listed: zinc sulphate 50 kg/ha, borax 10 kg/ha, copper sulphate 3.75 kg/ha and sodium molybdate 0.25 kg/ha to the soil. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Cauliflower – Irrigation; application of fertilizers; micronutrients, p. 125
- Region
Tamil Nadu - Last updated
- 2026-11-04
Curd problems and their causes Browning (brown rot) is caused by boron deficiency: spray 1 kg borax in 500 litres of water 30 days after planting. Whiptail (only the leaf midrib develops) is caused by molybdenum deficiency, worse in acidic soil: spray 100 g sodium molybdate in 500 litres of water 30 days after planting. Buttoning (small curds) comes from nitrogen deficiency or planting early varieties late; avoid transplanting old seedlings. Blindness (no terminal bud) is linked to low temperature. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Cauliflower – Physiological disorders, p. 127
- Region
Tamil Nadu - Last updated
- 2026-11-04
Carrot1 recommendations
Full guide for this crop →Irrigation and fertilizer Irrigate once in five days. Basal: FYM 30 t/ha, NPK 90:90:90 kg/ha, zinc sulphate 25 kg/ha and borax 10 kg/ha; then NPK 45:45:45 kg/ha after 45 days. A 0.5% zinc sulphate foliar spray is also listed. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Carrot – Irrigation; application of fertilizers; micronutrients, p. 128
- Region
Tamil Nadu - Last updated
- 2026-11-04
Radish1 recommendations
Full guide for this crop →Irrigation and fertilizer Plains: irrigate once a week. Basal: FYM 25 t/ha with N 25, P 100 and K 50 kg/ha; top-dress 25 kg N/ha after 30 days. Borax 10 kg/ha to the soil and 0.5% zinc sulphate sprays are also listed. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Radish – Irrigation; application of fertilizers, p. 130
- Region
Tamil Nadu - Last updated
- 2026-11-04
Beetroot1 recommendations
Full guide for this crop →Fertilizer Basal: FYM 20 t/ha, NPK 60:160:100 kg/ha, zinc sulphate 25 kg, borax 10 kg and sulphur 40 kg/ha; then 60 kg N/ha after 30 days. 0.5% zinc sulphate sprays on days 30, 45 and 60 are also listed. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Beetroot – Application of fertilizers, p. 132
- Region
Tamil Nadu - Last updated
- 2026-11-04
French bean1 recommendations
Full guide for this crop →Fertilizer and weeding FYM 25 t/ha at the last ploughing; N 90 and P 125 kg/ha on one side of the ridges; zinc sulphate 25 kg and borax 10 kg/ha basal. Weed at 20–25 and 40–45 days and earth up after each weeding. Pole type: FYM 25 t/ha, NPK 90 kg each basal and 45 kg each 20 days after sowing; stake at 20 days. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), French bean – Application of fertilizers; after cultivation, p. 111
- Region
Tamil Nadu - Last updated
- 2026-11-05
Dolichos bean1 recommendations
Full guide for this crop →Fertilizer and pandal Pandal type: 10 kg FYM and 100 g of 6:12:12 NPK mixture per pit as basal, 10 g N per pit after 30 days, and Azospirillum and phosphobacteria 2 kg/ha each at sowing; zinc sulphate 25 kg and borax 10 kg/ha basal. Hoe and weed three times and train the vines onto a 2 m pandal. (The bush-type fertilizer table in the source is not clearly printed.) Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Lab lab or Dolichos bean – Application of fertilizers; after cultivation, p. 110
- Region
Tamil Nadu - Last updated
- 2026-11-05
Potato1 recommendations
Full guide for this crop →Irrigation and fertilizer First irrigation 10 days after planting, then once a week. Basal: FYM 15 t/ha with Azospirillum and phosphobacteria 2 kg/ha each. NPK 120:240:120 kg/ha in two splits — half at planting, the rest 30 days later. Also basal: magnesium sulphate 60 kg/ha, sulphur 75 kg/ha and zinc sulphate 25 kg/ha. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Potato – Irrigation; application of fertilizers, p. 134
- Region
Tamil Nadu - Last updated
- 2026-11-04
Tapioca1 recommendations
Full guide for this crop →Irrigation and fertilizer Irrigate at planting and on the 3rd day, then every 7–10 days up to the 3rd month and every 20–30 days up to the 8th month. Irrigated crop: FYM 25 t/ha at planting; NPK 45:90:120 kg/ha basal, then N 45 and K 120 kg/ha at 90 days with earthing up; zinc sulphate 25 kg, sulphur 20 kg (as gypsum) and borax 10 kg/ha basal. Rainfed crop: FYM 12.5 t/ha with N 50, P 65 and K 125 kg/ha basal. Growing CO 2 vegetable cowpea before tapioca and ploughing in its haulms halves the FYM and phosphorus needed. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Tapioca – Irrigation; manuring, pp. 139–140
- Region
Tamil Nadu - Last updated
- 2026-11-04
Turmeric1 recommendations
Full guide for this crop →Manure and fertilizer Recommended dose: 150:60:108 kg NPK per hectare. At planting: FYM 25 t/ha, neem or groundnut cake 200 kg/ha, 25:60:18 kg NPK, 30 kg FeSO4, 15 kg ZnSO4, and 10 kg each of Azospirillum and phosphobacteria per hectare. Top-dress 25 kg N + 18 kg K per hectare on the 30th, 60th, 90th, 120th and 150th day. Spray 0.5% ZnSO4 and 1% FeSO4 + 0.1% citric acid on the 60th, 90th and 120th day. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Turmeric – Manuring, p. 172
- Region
Tamil Nadu - Last updated
- 2026-11-04
Garlic1 recommendations
Full guide for this crop →Fertilizer and weeding At the last ploughing: FYM 50 t/ha, Azospirillum 2 kg and phosphobacteria 2 kg/ha, NPK 75:40:40 kg/ha and 40 kg sulphur. Apply nitrogen as ammonium sulphate, not urea. To reduce rubbery cloves, reduce irrigation frequency, and spray boron 0.2% and zinc sulphate 0.25% on days 30, 60 and 90. Weed on the 30th and 60th day. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Garlic – Fertilizer; controlling rubberisation; weeding, p. 154
- Region
Tamil Nadu - Last updated
- 2026-11-04
Guava1 recommendations
Full guide for this crop →Irrigation and manuring Irrigate copiously right after planting, again on the third day, and then once in 10 days or as needed. Per tree: FYM 50 kg and 1 kg each of N, P and K in two splits, in March and October. To increase yield, spray urea 1% + zinc sulphate 0.5% twice a year (March and October). For boron deficiency (small leaves, fruit cracking and hardening), spray 0.3% borax (3 g/l) at flowering and fruit set. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Guava – Irrigation; manures and fertilizers, p. 28
- Region
Tamil Nadu - Last updated
- 2026-11-04
Papaya1 recommendations
Full guide for this crop →Irrigation and manuring Irrigate copiously after planting, then once a week. Apply 10 kg FYM per plant as basal. From the third month, after removing unwanted sex forms, apply 50 g each of N, P and K per plant every two months. At planting, apply mycorrhizae 50 g, phosphate-solubilising bacteria 25 g, Azospirillum 50 g and Trichoderma harzianum 50 g per plant, and 20 g each of Azospirillum and phosphobacteria again at six months. Spray 0.5% zinc sulphate + 0.1% boric acid at the 4th and 8th month. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Papaya – Irrigation; application of fertilizers; micronutrients, pp. 33–34
- Region
Tamil Nadu - Last updated
- 2026-11-04
Sweet orange1 recommendations
Full guide for this crop →Manures and fertilizers per plant First year: FYM 10 kg, N 200 g, P 100 g, K 100 g; increase every year by FYM 5 kg, N 100 g, P 20 g, K 40 g; from the 6th year: FYM 30 kg, N 600 g, P 200 g, K 300 g. Apply N in two doses (March and October) and FYM, P and K in October, in the basin 70 cm from the trunk. Once in 3 months, at new flush, spray zinc sulphate 0.5%, manganese 0.05%, iron 0.25%, magnesium 0.5%, boron 0.1% and molybdenum 0.003%; also apply 50 g each of zinc sulphate, manganese and iron per tree per year. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Sweet Orange – Manures and fertilizers per plant, p. 17
- Region
Tamil Nadu - Last updated
- 2026-11-04
Acid lime1 recommendations
Full guide for this crop →Pruning, zinc spray and mulching Remove branches on the main stem up to 45 cm from the ground. Regularly cut off dried twigs together with about one inch of green wood below, and burn them. Spray zinc sulphate 0.5% (500 g per 100 litres) three times a year — March, July and October — after new flushes appear. Mulch the basins with dry leaves or paddy husk about 10 cm thick. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Acid Lime – After cultivation, p. 14
- Region
Tamil Nadu - Last updated
- 2026-11-04
Pineapple1 recommendations
Full guide for this crop →Manure and fertilizer FYM 40–50 t/ha. Per plant: N 16 g, P 4 g and K 12 g in two equal splits at the 6th and 12th month. Foliar sprays of 0.5–1.0% zinc sulphate and ferrous sulphate every 15 days correct early deficiencies. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Pineapple – Manures and fertilizers, p. 30
- Region
Tamil Nadu - Last updated
- 2026-11-05
Amla1 recommendations
Full guide for this crop →Rust and fruit rot Ring rust: spray mancozeb 0.2% at 7–28-day intervals during July–September. Fruit rot (bird's eye spot): spray copper oxychloride 2.5 g/l at flowering; after harvest, treat fruits with borax or common salt (NaCl) at 20 g/l. Follow the instructions on the product label. Consult your local Agriculture Officer before use. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Amla – Diseases, p. 42
- Region
Tamil Nadu - Last updated
- 2026-11-04
Jasmine2 recommendations
Full guide for this crop →Irrigation and nutrition Irrigate immediately after planting, then weekly depending on weather. Apply NPK 60:120:120 g per plant per year in 2 equal splits, in November (after pruning) and June–July, along with 10 kg FYM per plant. If micronutrient deficiency appears, spray 0.25% ZnSO4 + 0.5% MgSO4 + 0.5% FeSO4 every fortnight until the yellowing disappears. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Malligai – Nutrition; micronutrients; irrigation, p. 250
- Region
Tamil Nadu - Last updated
- 2026-11-05
Pests and diseases: ask before you spray Yellowing of leaves has three main causes: iron deficiency, nematodes and root rot. The source lists chemical treatments for bud worm, blossom midge, red spider mite, nematodes, root rot and Alternaria leaf spot. It also lists Pseudomonas fluorescens: 25 g/m² to the soil and a 5 g/l foliar spray monthly after planting. Choose any chemical only with your local Horticulture or Agriculture Officer. Follow the instructions on the product label. Consult your local Agriculture Officer before use. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Malligai – Plant protection, pp. 250–251
- Region
Tamil Nadu - Last updated
- 2026-11-05
Rose1 recommendations
Full guide for this crop →Irrigation and nutrition Irrigate once in 2 days until plants establish, then once a week. After pruning in October and again in July, apply 10 kg FYM and NPK 6:12:12 g per plant. A foliar spray of 0.2% micronutrient mixture (20 g MnSO4 + 15 g MgSO4 + 10 g FeSO4 + 5 g B; 2 g of the mixture per litre of water) gives brightly coloured flowers. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Rose – Irrigation; nutrition; micronutrients, p. 248
- Region
Tamil Nadu - Last updated
- 2026-11-05
Chrysanthemum1 recommendations
Full guide for this crop →Irrigation and nutrition Irrigate twice a week in the first month, then weekly depending on weather. Recommended dose: FYM 25 t/ha and NPK 125:120:25 kg/ha — half the N and all the P and K at planting, the other half of N 30 days after planting. Foliar spray: ZnSO4 0.25% + MgSO4 0.5%. Azospirillum and phosphobacteria 2 kg/ha each, mixed with 100 kg FYM, at planting. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Chrysanthemum – Nutrition; micronutrients; biofertilizers; irrigation, p. 256
- Region
Tamil Nadu - Last updated
- 2026-11-04
Tuberose1 recommendations
Full guide for this crop →Irrigation and nutrition Irrigate before planting, then do not irrigate again until the bulbs sprout. After that, irrigate weekly in summer (earlier if the soil dries) and every 10 days in winter. Manure: FYM 25 t/ha and NPK 200:200:200 kg/ha — all P and K at final land preparation, and N in 3 equal splits (at final preparation, and 60 and 90 days after planting). Foliar spray: ZnSO4 0.5% + FeSO4 0.2% + boric acid 0.1%. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Tuberose – Manuring; micronutrients; irrigation, pp. 259–260
- Region
Tamil Nadu - Last updated
- 2026-11-04
Coconut1 recommendations
Full guide for this crop →Why young nuts (buttons) fall The source lists causes: excess acidity or alkalinity, poor drainage, severe drought, genetic causes, lack of nutrients, lack of pollination, hormone deficiency, pests and diseases. Remedies given include: lime if soil pH is below 5.5 and gypsum if above 8.0; drainage channels along contours; proper manuring; borax 200 g per palm per year in two splits for boron deficiency (crown choke); and 15 beehives per hectare to improve pollination, which also gives honey income. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Coconut – Button shedding, pp. 220–221
- Region
Tamil Nadu - Last updated
- 2026-11-05
Oil palm1 recommendations
Full guide for this crop →Irrigation and fertilizer Palms of 3 years and older need at least 150–200 litres of water a day, up to 300 litres in hot summers in older plantations; with drip, four drippers of 8 litres/hour for 5 hours give about 160 litres a day. Widen weed-free basins each year (1 m, 2 m, then 3 m radius) without piling soil at the collar. Five-year-old palms: 50 kg compost, FYM or green leaves. N:P:K:MgSO4 per palm per year — 400:200:400:125 g in year 1, 800:400:800:250 g in year 2, and 1200:600:1200:500 g from year 3, in two splits (July–August and December–January). Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Oil Palm – Irrigation management; basin management; manuring, pp. 225–226
- Region
Tamil Nadu - Last updated
- 2026-11-05
Rubber1 recommendations
Full guide for this crop →Fertilizer Before tapping, apply a 10:10:4:1.5 NPK-Mg mixture on a schedule from the 3rd month (225 g per plant) rising to 450–550 g per plant, in April–May and September–October; from the 5th year until tapping, 400 kg/ha a year in two doses. For trees under tapping: 10:10:10 mixture at 900 g per tree (300 kg/ha) a year in two splits; add 10 kg magnesium sulphate per 100 kg of mixture if magnesium is deficient. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Rubber – Manuring, p. 208
- Region
Tamil Nadu - Last updated
- 2026-11-05
Cocoa1 recommendations
Full guide for this crop →Irrigation and fertilizer Cocoa is sensitive to drought; in southern summers irrigate weekly. With arecanut: weekly in November–December, every 6 days in January–March and every 4–5 days in April–May. Trees 3 years and older: N 100 g, P 40 g and K 140 g per tree per year in two splits (April–May and August–September); half the dose for younger trees. Foliar FeSO4 0.5% + ZnSO4 0.5% twice a year. Pending expert review - Source
- Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Cocoa – Irrigation; manuring, pp. 204–205
- Region
Tamil Nadu - Last updated
- 2026-11-05
Sugarcane1 recommendations
Full guide for this crop →Nitrogen and potash top dressing Apply nitrogen and potash in three equal splits at 30, 60 and 90 days: 275 kg N + 112.5 kg K2O per hectare in assured-water (coastal and flow irrigated) areas; 225 kg N + 112.5 kg K2O in lift-irrigated, water-scarce areas; 175 kg N + 112.5 kg K2O in jaggery areas. For zinc-deficient soils, apply 37.5 kg zinc sulphate per hectare basally. Pending expert review - Source
- Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Sugarcane – Top dressing with fertilizers, p. 293
- Region
Tamil Nadu - Last updated
- 2026-11-04