How much fertilizer N should be applied at active tillering and panicle initiation?
• Rice requires N during the tillering stage to ensure a sufficient number of panicles, and rice requires N at panicle initiation to ensure a sufficient number of filled spikelets per panicle. The critical time for N application at panicle initiation is about 60 days before harvest of tropical rice. The critical time for N application at active tillering is about midway between 14 DAT or 21 DAS and panicle initiation. • The need of the rice crop for fertilizer N can be determined by leaf N status, which is related to leaf color. Dark green leaves have ample N, whereas yellowish green leaves are deficient in N. The leaf color chart (LCC) is a simple and inexpensive tool to rapidly assess leaf N status based on leaf color. • The LCC can be used to guide the application of fertilizer N to maintain an optimal leaf N content for achieving high rice yield with effective N management. As a rule of thumb, the more yellowish green the leaf color, the greater the need of the crop for fertilizer
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