How is fertilizer adjusted with the LCC at active tillering and panicle initiation?
• As a rule of thumb: • Apply little or no fertilizer N when the leaf color is green (LCC value 4). • Apply a relatively high rate of fertilizer N when the leaf color is yellowish green (LCC value 3). • Apply an intermediate rate of fertilizer N when the leaf color is intermediate between 3 and 4. • The rate of fertilizer N depends upon the ability of the soil to supply N to the crop as determined from the yield in a plot without fertilizer N (N-limited yield). If information is not available for yield without fertilizer N, it can be approximated from the expected ability of the soil to supply N to the crop. • Use the following procedure to select a fertilizer N rate for any given field and season: • Select one of the three options for approximate yield without fertilizer N. If yield without fertilizer N (N-limited yield) is known, select the nearest of the three N-limited yields in the table below. If yield without fertilizer N is not known: • Assume medium soil N fertility for clayey
