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Abstract
Four field experiments were carried out at Ismailia
Agricultural Research Station on sandy soil under sprinkler
irrigagatian system. The cultivated crops were wheat (Triticum
aestivum vulgars cv Sakha 69) during 1’:199-2000 and corn (Zea
mays, variety T. W. C321) during 2000. The main objectives of
the study are to investigate the effect of different Kc values and
rates of applied nitrogen fertilizers for both crops. Field
experiments also aimed to determine the effect of SMD, 50%
withholding irrigation water before and after heading, before and
after tasseling on some water relations, yield and yield variables.
The obtained results indicate that percent water uptake by
the 4 quarters of wheat and corn root depths were45.56, 27.97,
14.04 and 11.43 as well as 38.07, 28.76, 17.41 and 15.76,
respectively. Generally, all treatments significantly affected their
yields and NUE’ s. Decreasing the depth of irrigation water and I
increasing SMD as well as, rates of N fertilization and partial
withholding irrigation water at the vegetative growth stage I
increased N% of grain and straw yield.