تاثير تنش رطوبتي و نيتروژن بر عملكرد و اجزاء عملكرد دو رقم ذرت

Effect of moisture and nitrogen stress on yield and yield components of two maize (Zea mays L.) varieties

In order to study the effect of moisture stress and nitrogen deficit on yield and yield components of maize, an experiment was conducted in two locations, College of Agriculture of Tarbiat Modarres University and Kermanshah Razy University. In this experiment, four levels of moisture stress, moisture stress at vegetative stage, reproductive stage, both vegetative and reproductive stages and without moisture stress or control treatments, were randomized to main plot units and combination of two levels of nitrogen fertilizer (200 kg/ha and 100 kg/ha, nitrogen) and two maize varieties (S.C.647 and T.C.647) were randomized to subplot units. In this study, the maximum yield and yield components were obtained from control treatment and was not significantly difference with moisture stress treatment. at vegetative stage. Biomass, yield and yield components were reduced in treatments with moisture stress at reproductive and both vegetative and reproductive stages, but there was not significantly difference between these two former treatments for yield and yield components. Nitrogen deficit had negative effect on yield and yield components in control and stress treatments, but significant difference was not observed in other traits. T.C. 647 variety had better relative drought tolerance than S. C. 647 variety. Yield and yield components of varieties were often better in Kerman shah than Tehran.