BRASSICA NAPUSL بررسي اثرات ژيوتيپ و ميزان نيتروژن بر رشد دانه كلزا

The Effects of Genotype and Nitrogen Levels on the Grain Growth of Rapeseed (Brassierʹ Napus L.)

In order to study the effect of genotype and nitrogen levels on the grain growth of rapeseed, an experiment was conducted in a split plot design with four replications in 2000-2001 at Shahid Chamran University, Ahvaz. Two cultivars, PF7045/91 and Hyola308 were assigned in the main plots as main factors and four nitrogen levels, 100,150,200 and 250 kg N/ha in sub plots. In this,study, the analysis of grain growth by measuring grain filling period and grain filling rate was determined. A significant difference was observed between two cultivars for grain growth pattern. it was no revealed that effect of nitrogen levels on grain filling period is significantly higher that the effect of nitrogen levels on grain filling rate. There were no significant relations between grain filling and effective grain filling period with single plant grain yeild. Also, a significant positive relation was detected between grain filling period and seed oil percentage. The highest grain yields of PF7045/91 and Hyloa 308 cultivars on the basis of single plant records were obtained at the nitrogen levels of 250 kg N /ha and 150 kg N/ha, respectively. Also, the highest grain filling period and seed oil percentage were obtained at the level of 150 kg N/ha for both caltivars. However, the effect of nitrogen on grain filling rate and grain filling period was more than the effect of nitrogen on grain yield in Hyola308 as compared with PF7045/91 cultivar. It appears that Hyola 308 had higher N efficiency for reproductive plant parts.