Abstract
In tow successive season's 2011and 2012 two field experiments were ducted at the Rice Research and Training Center Farm, Sakha, Kafr El-Sheikh, Egypt. The investigation was carried out to study the effect of two nitrogen levels, i.e., 165 and 220kg N/ha and six times of nitrogen application, i.e., T1 ( 2/3 as basal + 1/3 at panicle initiation ), T2 ( 1/3 as B +1/3 at mid-tillering + 1/3 at P.I ), T3 ( 1/2 as B + 1/4 at M.T + 1/4 at P.I ), T4 ( 1/4 as B + 1/4 at M.T + 1/4 at P.I + 1/4 at booting ), T5 ( 1/4 as B + 1/4 at M.T + 1/4 at BT + 1/4 at complete heading ), T6 ( 1/4 as B + 1/4 at M.T + 1/4 at P.I + 1/4 at flowering ) of Egyptian hybrid 1 rice variety. The present study was laid out into split plot design with four replications. The most important findings of this study could be summarized as follows: Increasing N-levels caused significant increases in growth, yield and its components for most studied traits. Time of nitrogen application significantly effect on growth and yield and its components for all studied traits. The best combination was adding 165kg N/ha in four splits (1/4 as B, 1/4 at M.T, 1/4 at P.I, and 1/4 at flowering) to produce optimum grain yield. From the obtained results, it can be recommended that for achievement of high yield production from Egyptian hybrid 1 rice variety when it grown under broadcast seeded rice and application of N-fertilizer at the rate of 165 kg/ha, we must splitting nitrogen fertilizer in four equal doses i.e. as basal application, at mid-tillering stage, at panicle initiation stage and last at the flowering stage under these conditions of this study.
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