EFFECT OF NITROGEN LEVELS AND NUMBER OF WEEDING ON TUE YIELD YIELD ATTRIBUTES AND QUALITY OF RAPESEED

Abstract

A field experiment was conducted in the Rahi season (November-February) of 2005-2006 to study the response of rapeseed line SAU-C-1- 7 in respect of yield, yield attributes and oil yield to difibrent nitrogen levels and number of weeding. The treatment comprised of 4 levels of nitrogen and 3 levels of weeding. Different N levels were 0 kg N ha (N 0 ). 90 kg N hi' (N 1 ). 120 kg N hi' ( '2)

(N3 ). The weeding treatments were no weeding (W and 150 kg N ha" 0 ). one weeding at 20 DAS (Wi) and two weedings at 20 and 45 DAS (W2). The experiment was laid out in a Ihetorial Randomized Complete Block Design (RCBD) with three replications. Nitrogen levels and number of weeding significantly influenced the growth, yield and yield attributes of rapeseed. Plants tn* plant height, branches plant''. siliquac planf', length of siliqua. seeds siliqui'. 1000-seed weight. seed yield. stover yield, biological yield, harvest index, oil content and oil yield were significantly influenced by nitrogen levels and weeding as individual litctor. Oil content was only influenced by nitrogen application. The results revealed that nitrogen at the rate of 120 kg ha" showed the best performance regarding to yield components and yields. 'l'he maximum seed yield ha4 (2343.4 kg ha 4 ) with 120 kg N ha" was 194.28 0 %. 71.11% and 6.87% higher than the yield obtained from 0 kg, 90 kg and ISO kg N ha''. respectively. In case of weeding factor, it was observed that two hand weeding resulted in maximum production of yield and yield attributes as well as seed and oil yields. Two hand weeding increased the seed yield by 17.66% over control. The interaction effect of nitrogen levels and number of weeding revealed that 120 kg N along with two hand weeding showed the best performance in producing the yield attributes and yields. Number of branches plant". number of siliqua plant'', number of seeds plant'', 1000seed weight had a significant correlation with seed yield p}j' I with the r values of 0.91. 0.97. 0.88 and 0.96. respectively. All of the yield attributes were highly significant. The relationship between the yield attributes and yield was highly sign i lican t.