Performance of sunflower in response to nitrogen management at different stages
2007
Munir, M.A. (Sugarcane Research Inst., AARI, Faisalabad (Pakistan)) | Malik, M.A. (University of Agriculture, Faisalabad (Pakistan). Dept. of Agronomy) | Yaseen, M. (University of Agriculture, Faisalabad (Pakistan). Dept. of Mathematics and Statistics)
Studies were conducted for two years (2004 and 2005) to access the comparative productivity of sunflower to nitrogen application in various splits. Nitrogen was applied at 100 Kg ha-1 as full at sowing, full at 1st irrigation, full at flowering, 1/2 at sowing + 1/2 at 1st irrigation, 1/2 at sowing + 1/2 at flowering, 1/2 at 1st irrigation + 1/2 at flowering, 1/3 at sowing + 1/3 at 1st irrigation + 1/3 at flowering, 1/3 at sowing + 1/3 at 1st irrigation + 1/3 at seed formation and 1/3 at sowing + 1/3 at flowering + 1/3 at seed formation. The highest achene yields of 2446 kg ha-1 and 2370 kg ha-1 were obtained in 2004 and 2005, respectively from plots, where nitrogen was applied in three equal splits at sowing, at first irrigation and at flowering. The mean crop growth rate (21.52 and 20.95 g m-2 day-1) and mean net assimilation rate (8.97 and 8.78 g m-2 day-1) also gave significantly highest values in the same treatment during both years. All t he quality traits were significantly affected with the application of nitrogen in splits and had a positive correlation with the achene yield except achene oil content (%) and oleic acid (%) in oil.
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