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Start LCC readings from 14 DAT (Days after Transplantation) or 21 DAS (Days after sowing)
The last reading is taken when the crop just starts to flower.
Randomly select at least 10 disease-free rice plants or hills in a field with uniform plant population from different areas of the plot.
Select the topmost fully expanded leaf from each hill or plant
Place the middle part of the leaf on a chart and compare the leaf color with LCC shades
Do not detach or destroy the leaf
Measure the leaf color under the shade of your body, because direct sunlight affects leaf color readings
If possible, the same person should take LCC readings at the same time of the day every time
If more than five leaves read below a set critical value, apply
23 kg N ha-1 (one 50-kg bag of urea/ha) for wet season or
The suggested critical values are:
4 for transplanted rice (TPR)
3 for high-density wet-seeded rice (WSR)
Repeat the process at 7 to 10 day intervals or at critical growth stages (early tillering, active tillering, panicle initiation, and first flowering) and apply N as needed.
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