Rice needs a tropical or sub-tropical hot and humid climate. Minimum temperatures needed for germination, flowering and grain formation are 10°C, 23°C and 20°C. Optimum temperatures are 21–36°C for growth, 25–29°C for flowering and 20–25°C for grain formation. It is a short-day plant.
Pending expert review
Source
Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Rice – Climate requirement (start of chapter)
Region
Tamil Nadu
Last updated
2026-11-04
Acid soils
For acid soils, apply lime based on soil analysis to obtain normal rice yields. Lime is applied at 2.5 t/ha before the last ploughing, to each crop up to the 5th crop.
Pending expert review
Source
Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Transplanted rice – Land preparation (problem soils d), p. 19
