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
