عنوان مقاله [English]
In order to study of irrigation intervals and nitrogen splitting effects on yield and yield components of two spring cultivars of Canola (Brassica napus L), an experiment was conducted in Spring 2003, at research station of college of agriculture, Ferdowsi University of Mashhad. Experimental design was a split - plot factorial based on completely randomize block design with three replications. The main plot factors including irrigation intervals (7,14 and 21 days) and Canola cultivars (ORO and MIDAS) and nitrogen splitting (100:0 (N1), (25:72 (N2) , (50:50 (N3) and (0: I 00 (N4)) were allocated to sub plat whit a factorial arrangement. Results showed that number of pods per plant, weight of I 000 seeds .biological yield, seed yield and oil percentage were reduced
with increasing irrigation intervals. Oil percentage were affected by nitrogen splitting. The highest oil percentage was produced in treatment of N3 and N4• The weight of I 000 seeds and oil percentage were affctcd by variety. ORO produced the higher weight of seeds (4.2 gr) than MIDAS (2 gr), but MIDAS produced more oil percentage than ORO. Oil percentage was increased by reduction of irrigation intervals. The highest seed yield reduction was observed \ ith increasing the irrigation intervals. From the splitting treatment, N2 and N3 showed a better performance.