ارزيابي اثر تاريخ كاشت و قطع برگ بر عملكرد و اجزاي عملكرد دانه ذرت هيبريد سينگل كراس 700 در شرايط محيطي ايذه

Evaluation of planting date and leaf cutting effects on yield and yield components of corn (hybrid single cross 700) in Izeh conditions

In order to investigate the effect of planting date and leaf cutting(defoliation) on yield and yield components of corn (hybrid single cross 700), an experiment was conducted in 2009, as split plot in randomized complete block design with three levels of planting date (June 26, June 11,July 27 ) as main-plot factors and defoliation in three levels (no defoliation,defoliation in tassel emergence stage,defoliation in anthesis-silking interval) as sub-plot factors. Results showed that there were no significant effect of planting date and defoliation on number of kernel rows per ear, kernel number per ear, kernel weight per ear and grain yield .Planting date revealed no significant effect on number of rows per ear, in contrary, defoliation showed significant effect on that ,at 1% probability, also 1000-kernel weight was not affected by planting date and defoliation.There were significant interaction effect of planting date x defoliation on kernel rows per ear.The highest grain yield was obtained in planting date of June 26 with 10.56 ton/ha .The treatment of no defoliation showed the highest grain yield. Interaction effects of treatments indicated that the lowest yield was related to defoliation in tassel emergence stage on July 27.Our results showed that late planting and defoliation can cause yield decline in corn.Finally grain yield depends on the time of defoliation ,as well as , the weather conditions of the region.