Growth and yield of hybrid and inbred rices as influenced by n splitting under saline soil conditions [electronic resource].

Includes references.

Field experiments were conducted at EI-Sirw Agricultural Research Station, Dammietta Governorate during 2004 and 2005 seasons to find out the proper time and split of N application on source, sink and yield potential of hybrid rice. The treatments of nitrogen splitting consisted of, 2/3basal(B) + 1/3panicle initiation (PI),1/3B+ 1/3at tillering stage (T)+ 1/3PI, 1/3T + 1/3 midtillering (MT)+ 1/3PI, 1/3T + 1/3PI+ 1/3 flowering (F), 1/4B+ 1/4MT + 1/4PI+ 1/4F, 1/4T + 1/4MT + 1/4PI+ 1/4F, 1/4B+ 1/4T + 1/4Mt+ 1/4PI -5.0 kg urea sprayed at F (2% of urea), and weekly application of 18kg N ha-1 started just before transplanting (DAT) (10 times). The tested rice varieties included three hybrids, SK2025H, SK2058H &SK2047H and one inbred Le. Sakha 104. The most promsing results could be summarized as follows, the hybrid rice varieties had higher variation in all parameters under study over Sakha 104. The best one was SK2025H in grain yield with out any significant differences with those produced by other hybrids in the second season while with only Sk2047H in the first season. Sk2025H was better in filled grains and sink capacity as well as harvest index while SK2047 had higher values of panicle numbers and panicle weight. The three tested hybrids did not significantly vary in majority of their source parameters. Furthermore, all nitrogen basal application were not so favorable under saline soil condition for all varieties under study. Three or four nitrogen splitting Le.1/3T +1/3PI+1/3F for Sakha 104 and Sk2025H and/or1/4T+1/4MT+1/4PI-1/4F for the rest of tested hybrids markedly improved all source and sink parameters leading to full expression of high yield potentiality for hybrid rice getting high grain yield in saline soil. The correlation between source, sink parameters and the grain yield show that most of them significantly correlated with grain yield.

Summary in Arabic.

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