Abstract
A study of the utilization of nitrogen from (N15H4)2SO4 by the rice plant in relation to time of application was made in pot culture. Results show that fractional application of nitrogen with two-third at planting followed by one-third top-dressed at the boot stage results in the highest recovery of fertilizer nitrogen as compared to full application at planting or split application with top-dressing at the tillering stage. The former treatment also gives significantly higher grain yield, which is due to the increase in the number of filled grains per panicle. Nitrogen absorbed from top-dressing is found to be translocated to the growing parts.
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