بررسی اثر تأخیر در برداشت بر میزان ریزش دانه ارقام کلزا

In order to study resistance to shattering, 5 rapeseed genotypes including Option500, Sarigol, RGS003, Hyola401 and Hyola60 were evaluated in a split plot experiment with 4 replications for two years at Agriculture Research Station of Biekola. The main plots were included 4 harvesting dates including A1: harvesting at seed color changing of ninety percentage of pods in main stem and A2, A3 and A4 10, 20 and 30 days after the first harvesting of each varieties, respectively. Sub plots were included 5 studied genotypes. The differences of seed yield of each genotypes in different harvesting dates with compare to its seed yield in first harvesting date (Yo-Yti) were considered as indices of shattering and it be used for statistical analysis. In this study Hyola401 and Sarigol with had 3993.52 and 3266.99 kg/ha respectively. Significant mean square of genotype x harvesting dates revealed different ranks of shattering of genotypes in different harvesting dates. Amount of seed yield shattering was increased in third and fourth harvesting. Hyola60 and Hyola401 had less percentage seed yield shattering and Sarigol had more percentage of seed yield shattering