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Pakistan Journal of Biological Sciences
  Year: 2008 | Volume: 11 | Issue: 2 | Page No.: 232-237
DOI: 10.3923/pjbs.2008.232.237
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Impacts of Fertilization Systems on Nitrogen Loss and Yield of Oilseed Rape (Brassica napus L.)

H. Sabahi, A. Ghalavand and S.A.M. Modarres Sanavy


Farmyard manure is considered as a source of plant nutrient supply, but high N loss and low N use efficiency are often serious challenges facing this source of nutrient. It is supposed that a combination of manure with inorganic fertilizers can reduce this problem. A two year experiment was conducted in 2004-2005 at Mazandran province of Iran in order to study the effects of manure, inorganic nitrogen and combination of manure-inorganic nitrogen on N loss and yield of winter oilseed rape (Brassica napus L.) under rainfed conditions. Treatments included 0, 50, 100 and 150 kg N ha-1 urea (F0, F50, F100, F150), 100 kg N ha-1 urea + 50 kg N ha-1 manure (F100M50), 50 kg N ha-1 urea + 100 kg N ha-1 manure (F50M100), 150 kg N ha-1 manure (M150). The highest grain yield (3 ton ha-1) was obtained with the 150 kg N ha-1 as urea treatment in both years. Grain yield in M150 treatment was significantly lower (p<0.05) than F150. However F100M50 and F50M100 resulted in similar yields compared with F150 treatment. Results also showed that F100M50 and F50M100 treatments decreased N loss (4 and 3 kg N ha-1 year-1, respectively) compared to application of manure alone (33.5 kg N ha-1 year-1) and F150 (36 kg N ha-1 year-1). Overall, it could be conducted that F100M50 is the best treatment because it produced similar grain yield compared to F150 while resulted in lower N loss as well.

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How to cite this article:

H. Sabahi, A. Ghalavand and S.A.M. Modarres Sanavy, 2008. Impacts of Fertilization Systems on Nitrogen Loss and Yield of Oilseed Rape (Brassica napus L.). Pakistan Journal of Biological Sciences, 11: 232-237.

DOI: 10.3923/pjbs.2008.232.237






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