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Responses of Seed Yield and Economic Benefit of Winter Oilseed Rape(Brassica napus L.) to Different NPK Ratio and Dose

Yingzi WANG;Chang TIAN;Xuan ZHOU;Wenming WANG;Jianwei PENG;Zhenhua ZHANG;Haixing SONG;Chunyun GUAN;College of Resources and Environment, Hunan Agricultural University, Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use & Hunan Provincial Key Laboratory of Plant Nutrition in Common University & National Engineering Laboratory of College of Resources and Environment;College of Horticulture and Landscape, Hunan Agricultural University;College of Environmental Science and Resources, Zhejiang University;Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China;Hunan Branch, National Center of Oilseed Crops Improvement;  
Field experiments were conducted during 2008-2010 to investigate the effects of NPK fertilization on seed yield and economic benefit of a new hybrid cultivar of winter oilseed rape(Brassica napus L.)- Xiangzayou763,and to determine the optimum NPK ratio and dose in Hunan,China.The results showed that NPK ratio(1:0.50:0.50) with 180 kg/hm2 N,90 kg/hm~2 P_2O_5 and 90 kg/hm~2 K_2O was the optimum combination for the highest seed yield(2 231.13 kg/hm2) and economic benefit(9 816.97 Yuan/hm~2),of which 1 641.23 Yuan/hm~2 being set for fertilizer investment(VCR=4.11).Besides,the effects of N,P and K fertilizers on seed yield and oil production of winter oilseed rape were not identical.N had the greatest effect on plant growth of winter oilseed rape,followed by P and K.Total leaf number,green leaf number,leaf length and width,rhizome diameter,branch number,dry weight per plant and other agronomic characters in high N treatments were higher than those in low N treatments.By correlation and path analysis of yield components,the contribution rate to seed yield was found:effective silique number per plantseed number per silique1 000-seed weight.
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