عنوان مقاله [English]
Study the growth process of rapeseed will provide the possibility to manage its cultivation with regard to optimal adaptation to the growing environment. This study was performed using a split plot experiment based on a randomized complete block design with three replications. Four planting dates (Novemeber 6, November 21, December 6 and December 21) were allocated to the main plots and four varieties (Hyola401, PP.401, R.G.S.300 and Option500) to the subplots. The results showed that late planting at the critical growth stage in the end season will encounter to high temperature, and this resulted in better planting date of 6th November for yield and physiological indices as compared to other planting dates. Hybrid Hyola401 presented the heighest yield (3603 kg.ha-1), maximum LAI (3.51), total dry matter (1249 g m-1), growth rate (21 g.m-2. day-1), net assimilation rate (7 g.m-2 day-1) and relative growth rate (0.064 g.g-1.day-1) at the flowering stage in comparison to other cultivars. In general, the results showed that Hyola401 had higher growth indexes than other varieties if it is varieties on mid November in the Khuzestan province of Iran.