Effect of split application of nitrogen fertilizer on morpho-physiological attributes and grain yield of broadcast seeded Egyptian hybrid rice (1) [electronic resource].

Includes references.

An experiment was carried out at the Experimental Farm of Rice Research and Training Center (RRTC), Sakha, Kafr El-Sheikh, Egypt, during 2011 and 2012 seasons. The experiment was laid out in a split plot design with four replications. The main plots were devoted to the nitrogen level 220kg N/ha in form of urea (46.5% N). The sub--plots were allocated to the six times of nitrogen application to assess the effect of six nitrogen application treatments, viz., T 1: (2/(3) as B ( basal ) +1/3 at PI (panicle initiation)), T_2: (1/3 as B + 1/3 at MT (mid-tillering) +1/3 at Pl.)), T_3:(1/2 as B + 1/4 at MT + 1/4 at PI.)), T_ 4:(1/4 as B + 1/4 at MT + 1/4 at PI+ 1/4 at BT (booting)), T_5:(1/4 as B + 1/4 at MT + 1/4 at BT +1/4 at CH (complete heading)), and T_6:(1/4 as B + 1/4 at MT + 1/4 at PI + 1/4 at F ( flowering)) on morpho-physiological attributes and grain yield of Egyptian hybrid rice (1) under broadcast seeded-rice. The results revealed that nitrogen levels caused significant increases in all morphophysiological attributes and grain yield of Egyptian hybrid rice (1), except for number of primary branches/panicle, number of panicle/m2 , panicle weight and 1000-grain weight in both seasons. Leaf area index and dry matter production at flowering were significantly increased in first and second seasons, respectively, Increasing N-level up to 220kg N/ha significantly increased number of unfilled grains/panicle and straw yield t/ha. In addition, application of 165kg N/ha produced the highest values of number of filled grains/panicle, grain yield tfha and harvest index in both seasons.

Summary in Arabic.

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