Cotton is a tropical warm-season crop. It needs a daily mean temperature of 16°C for seed germination, 21–27°C for vegetative growth and 27–32°C for the fruiting phase. Abundant sunshine during boll maturation and harvest is essential for good quality produce. Heavy rain or heavy irrigation during the fruiting period causes shedding of flowers and young bolls.
Pending expert review
Source
Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Cotton – Climate requirement, p. 253
