بررسي روغن دانه و پروتئين دانه دو رقم كلزا و ارتباط آن با عملكرد روغن دانه و عملكرد پروتئين دانه

Study oil seed and seed protein of two rapeseed(l?ras,sica napus L.) and relations of them with oil yield and protein yield

In order to determine the effects of water deficit and different nitrogen levels on oil seed, seed protein and relations of them with oil yield and protein yield in rapeseed, two field experiments were conducted using a factorial split-plot in randomized complete block design in 2005 and 2006 growing seasons at Seed and Plant Improvement Institute, karaj. In this study, two cultivars (Zarfam and Modena), three water regimes (irrigation after 40, 60 and 80 percent depletion of soil water) and four nitrogen levels (0, 75, 150 and 225 Kg/ha) were studied that irrigation and nitrogen treatments were in main plots and cultivars were in sub plots. Results showed that increasing the nitrogen rate from 0 to 225 kg/ha and increasment in soil water, caused increasing seed yield, oil yield and protein yield. In water stress condition the seed oil decreased (7.17%) but the seed protein increased (8.31%). Increasing nitrogen used caused to decreasing seed oil (10.08%) and increasing seed protein (25.19%). Oil yield had strong and significant correlation with seed yield and oil percent. Also, protein yield had positive and significant correlation with seed yield. In contrast the two varieties, Zarfam had a higher nitrogen uptake and mobilization under normal irrigation and severe water stress conditions, and also in higher and lower nitrogen conditions.