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Journal of Applied Sciences
  Year: 2010 | Volume: 10 | Issue: 14 | Page No.: 1461-1465
DOI: 10.3923/jas.2010.1461.1465
 
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Effects of Nitrogen and Plant Density on Rapeseed (Brassica napus L.) Yield and Yield Components in Southern Iran

S.A. Kazemeini, M. Edalat, A. Shekoofa and R. Hamidi

Abstract:
This study was carried out to evaluate the influence of nitrogen levels (0, 50, 100 and 150 kg N ha-1) and plant densities (70, 80 and 90 plants m-2) on some growth parameters and yield components of the rapeseed. The experimental design was split plot with three replications during 2006-2007 and 2007-2008. Results revealed that with increasing plant density from 70 to 80 and 90 plants m-2, 1000 seed weight (partial R2 = 0.91), number of branches (partial R2 = 0.83) and seed weight (partial R2 = 0.94) were the most important variables contributing seed yield, respectively. As, with increasing nitrogen, variables contributing seed yield, were changed. Stepwise regression analysis showed that with increasing nitrogen from 0 to 50 and from 100 to 150 kg ha-1, seed weight per main pod, pod number per branch and seed number per sub pod explained 91, 89 and 87% variations of seed yield, respectively. It means that, with increasing of nitrogen from 0 to 50 kg N ha-1, the role of seed weight per main pod decreased (partial R2 = 0.91 vs. 0.75). Pearson correlation results revealed that seed yield has positive correlation with seed weight per main pod (r = 0.89*), number of pod per branch (r = 0.93**), number of seed per main pod (r = 0.86*). According to the results, application of 150 kg N ha-1 and 90 plants m-2 for the maximum return unit area were recommended. Finally, it can be concluded that under high density and nitrogen, seed weight per sub pod was the most important variable contributing seed yield.
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How to cite this article:

S.A. Kazemeini, M. Edalat, A. Shekoofa and R. Hamidi, 2010. Effects of Nitrogen and Plant Density on Rapeseed (Brassica napus L.) Yield and Yield Components in Southern Iran. Journal of Applied Sciences, 10: 1461-1465.

DOI: 10.3923/jas.2010.1461.1465

URL: https://scialert.net/abstract/?doi=jas.2010.1461.1465

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