تأثير عملكرد عناصر غذايي بر خوصيات زراعي ذرت (رقم سينگل كراس 704) تحت تنش كمبود آب در مراحل مختلف رشد

Effect of nutrition elements application on agronomical characters of hybrid maize (KSC.704) under water deficit stress at different growth stages

In order to study effect of nutrition elements application on agronomical characters of maize hybrid (KSC.704) under water deficit stress at different growth stages a field experiment was carried out in the Agricalture Research Station of Islamic Azad University, Arak Branch, Iran in 2006-2007. Experimental design was split plot factorial based on randomized complete blocks design with four replications. Four irrigation levels including: optimum condition (L1), water deficit stress in stage V8 (L2), water deficit stress in stage of blister (L3) and water deficit stress in stage of grain filling (L4) were assigned to main plot, and combination of selenium (with and without using) and microelements (with and without using) were randomized to sub-plots. Results showed significant differences on plant height, ear height from ground, ear weight, cob weight, ear length, biological yield, grain yield and biological water use efficiency under water deficit stress between treatments. The lowest effect of water deficit stress on grain yield and biological yield was in vegetative stage. Also the highest water use biological efficiency obtained from this stage. However using of selenium increased all agronomic traits but effect of selenium on measured traits was non significant. Interactions of water deficit stress and selenium on grain yield, biological yield and water use biological efficiency at 1% probability levels was significant. Using of selenium at different growth stages under water deficit stress increased this trait as compared without selenium. The highest grain yield (8159.330 kg haʹ1) and biological yield (16728.76 kg haʹ1) obtain from water deficit stress at vegetative stage, with selenium and without micro element that with control (non water deficit) stress, without selenium and micro element wan non significant.