مقايسه رشد و عملكرد دانه ارقام كلزا در شرايط ديم گرگان

Comparison of growth and grain yield of Rapeseed cultivars under rainfed conditions of Gorgon

In order to study growth and grain yield of five rapeseed cultivars(Cerese, Cobra, Global, Rijent and Tower)an experiment was conducted in 1997-1998, under rainfed conditions of Gorgon with average annual rainfall of 500-600 mm. The experimental design was RCBD with four replications. The results showed significant differences in grain yield of cultivars. Ceres showed the highest yield, due to higher leaf area index (LAI), crop growth rate (CGR), and total dry matter (TDM).growth duration didnʹt significantly differ among four cultivars of Cerese, Global, Rijent and Tower. The susceptible stage of silique development in these cultivars occurred at late winter and early spring. However, in Cobra, this stage occurred at late spring, which resulted in decreasing grain yield, due to water limitation. Therefore, LAI, CGR, TDM, number of siliques and grains per plant are introduced as effective indices on grain yield of rapeseed cultivars.