حساسیت ارقام گندم رایج مناطق معتدل استان خراسان به تاریخهای کاشت رود هنگام و کرپه

The present investigation was conducted during 2003-2004 at NeishaboorAgricultural Reserch station to evaluate response wheat cultivars of moderate zone in khorasan province to early and late planting dates .The experiment was laid out in a randomized complete block design adopting factorial split plot arrangment.Main plots devoted to seeding date and sub plots to wheat cultivars each treatment was replicated 3 times .Results revealed that planting date affected grain yield significantly. significant differences were observed among different cultivars concerning grain yield . Highest grain yield 6619 kg/ha was recorded when planting date was october . Yield losses in late planting date was due to lower number of spike production per area unit .Falat and Pishtaz cultivars recorded highest yield while while were sown in october(early planting ) .Back cross Roshan showed the lowest reaction to planting date so it may be recommended as a stable cultivar. at various sowing dates . Chamran and Mahdavi were the most reactive (sensetive )cultivars to change in planting .Maximum yield losses were observed in the first(15 mehr) and last planting dates (15azar) .High corrolation (r=0.48)were observed between grain yield and number of spike /m2 that showed the effective role number spike in this research among other yield componentes.

Keywords:

کاشت زودهنگام , کاشت کرپه , نی شابور , گندم روشن , فلات , بک کراس روشن , کراس اروند , چمران , مرودشت , پیشتاز , مهدوی