نوع مقاله : مقاله پژوهشی
1 دانشجوی کارشناسی ارشد، گروه زراعت، پردیس علوم و تحقیقات خوزستان، دانشگاه آزاد اسلامی، اهواز، ایران
2 دانشیار، گروه زراعت، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران
عنوان مقاله [English]
In most regions with mediterraneanclimate such as Iran, wheat farming is faced to drought and heat stresses at grain filling period and consequently a sharp decrease in grain yield. The evaluation of heat stress on wheat cultivars yield in Jarahi Mahshar region, was conducted through a split plot design with randomized complete block basis with three planting dates as the main factors (First: 2014.11.6, Second: 2014.12.6 and Third: 2015.1.5) and three cultivars of wheat (Chamran, Falat, Virinak) as sub-plots with three replications in cropping season 2014-15. Results showed that planting date and the cultivars had a significant impact on grain yield, yield components, spike height, biological yield, harvest index, the scale of redistribution, share of redistribution, efficiency of redistribution, length of spike, amount and efficiency of current photosynthetic. Interaction effect between planting date and the cultivars significantly impact on the numbers of spike per square meters, the number of grains per spike, grain weight (1000 numbers), grain yield, scale of redistribution, efficiency of redistribution, amount of current photosynthesis, biological yield, harvest index, spike length, share of redistribution and current photosynthesis efficiency. Chamran had the highest yield with average of 5548 kg.ha-1 in first planting date and Falat had the lowest yield with an average of 2100 kg.ha-1 in third planting date.