The effect of planting date and seed rate on yield and components yield on oilseed rape cultivars in Sistan

摘要

In order to determine the best of sowing date and seed rate,on oilseed rape cultivars an experiment with using split plot-factorial design with three replication was conducted in zahak Agirculture Research station of zabol, during two seasons (2003- 2004 and 2004-2005 ).This site located in Southern East Iran country.The main factor was sowing date in Four levels started from 6th of October continued in a 15 days intervals include (15October,21October,5November and 20November) and was subplots combination from cultivars at two levels(Hyloa401 and RGS003) and seed rate at three levels (6,8 and 10 kg/ha). Results achieved from combination analysis showed that planting date had significant differences at the 1% level on number of silique in plant, number seed in silique, 1000 grain weight, height,oil percent,oil yield and seed yield. With dealy in sowing date seed yield and other traits had decreased. The highest seed yield with mean(3943 and 3830 kg/ha)in sowing date 21 October and 15 October and least seed yield with mean 1830 kg/ha in sowing date 20 November was obtaind. The effect cultivars exception number seed in silique, height and oil percent on the other traits had not significant differences. Cultivar, RGS003 With mean 3249 kg/ha in comparsion with Hyola 401 with mean 3062 hg/ha was the best. The effect seed rate only on 1000 grain weight, height and number plant in square (m2) had significant differences. Despit of no significant difference the highest seed yield with mean 3282 kg/ha at seed rate high (10kg/ha) was obtained. Intraction effects study of factors exception, number of silique in plant, 1000 grain weight and height on others traits had not significant difference.With considering of rsults, highest productivity and least environment losses, sowing date (21October), seed rate 10 kg/ha and cultivars Hyloa401 and RGS003 were recommended for Sistan proveince in Iran.