The recommended dose for rainfed sorghum is 40 kg N and 20 kg P2O5 per hectare. It can be halved if FYM is applied at 5 t/ha.
Pending expert review
Source
Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Rainfed sorghum – Fertilizer, p. 75
Region
Tamil Nadu
Last updated
2026-11-04
Weed-free period
Keep the sorghum field free of weeds from the second week after germination until the fifth week.
Pending expert review
Source
Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Rainfed sorghum – Weed management, p. 75
Region
Tamil Nadu
Last updated
2026-11-04
Pre-emergence herbicide (rainfed)
If sufficient moisture is available, spray atrazine at 0.25 kg/ha as pre-emergence within 3 days after a soaking rain for sole sorghum. For sorghum intercropped with pulses, use pendimethalin at 0.75 kg/ha instead.
Follow the instructions on the product label. Consult your local Agriculture Officer before use.
Pending expert review
Source
Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Rainfed sorghum – Weed management, p. 75
Region
Tamil Nadu
Last updated
2026-11-04
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
