effect of water deficit¬ stress at terminal growth stages on yield and seed oil quality of rapeseed (brassica napus l.) cultivars

in order to study the effect of water deficit stress at different growth stages on yield and seed oil quality of rapeseed cultivars, a field experiment was conducted as split-plot in a randomized complete block design arrangement with three replications in 2009-2010 growing seasons in abarkouh in iran. four levels of irrigation were located in the main plot including, (i1) normal irrigation based on 40 percent accessible water, (i2) irrigation based on 80 percent accessible water from stem elongation stage to maturity, (i3) irrigation based on 80 percent accessible water from flowering stage to maturity, (i4) irrigation based on 80 percent accessible water from seed filling stage to maturity and five rapeseed cultivars including, hayola 401,zarfam, modena, sarigol and option 500 were considered as sub plot. the analysis of variance showed that there were significant differences between cultivars and different levels of irrigation for seed yield, oil content, protein content, meal glucosinolate content and fatty acids (p