جستجوی مقالات مرتبط با کلیدواژه « تنش کمبود آب » در نشریات گروه « اقتصاد کشاورزی »

This experiment was conducted in the research station of Islamic Azad University- Arak Branch، Iran in 2009-2010. The experimental design was split plot factorial based on randomized complete blocks design with four replications. The treatments including of water deficit stress in three levels: complete irrigation، cut-irrigation at milk stage and Cut-irrigation at dough stage in were assigned to main spilt and salicylic acid (without and with using equal to 1 Mm as seed priming) and cultivars including of Alvand and Shahriar as factorial were randomized to sub plot. Results showed that cut-irrigation at milk and dough stage reduced grain yield by %24 and %15 respectively. Application of salicylic acid in complete irrigation، cut-irrigation at milk and dough stage increased grain yield by 7. 2، 7 and 8. 7%. Effects threefold of treatments showed that، highest grain yield equal 3698kg ha-1 obtained from interaction of complete irrigation، with salicylic acid and Alvand cultivar، but in condition of cut-irrigation highest grain yield equal 3378 kg ha-1 obtained from interaction of cut- irrigation at dough stage، with salicylic acid and shahriar cultivar. The results of experiment showed that salicylic acid application may be decreased effects of water deficit.

In order to study effects of water deficit stress on agrophysiological traitsof Maize cultivars, an experiment was conducted in the farm research station of Arak Islamic Azad University, Iran in 2009. The experimental design was split plot based on RCBD with three replications. The treats were considered as irrigation in three levels: 100% (control), 75% and %50 (water deficit stress) crop water requirement plant and maize hybrids consisted of KSC500, KSC524, KSC700, KSC704 and DSC370. Results showed that water deficit stress reduced relatively water content,cell membrane stability and grain yield. About hybrids, the highest grain yield obtained from early and medium maturity hybrids. Also the highest cell membrane stability and relatively water content belonged to medium maturity hybrids. Interactions effects of treatments showed that, in condition of moisture optimum(100% crop water requirement) and water deficit stress (75% and 50% crop water requirement plant), grain yield in KSC524 and 500 was high compared to other hybrids. The highest grain yield equal 8624.22 Kg/ha by treatment KSC524 with 100% crop water requirement plant and lowest grain yield equal 4072.32 obtained from treatment KSC700 with 50% crop water requirement.