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《Acta Agrestia Sinica》 2012-01
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Effects of Nitrogen Fertilizer and Planting Density on Alfalfa Growth and Seed Yield

LI Li,LI Ning,SHENG Jian-dong,WANG Hao(College of Grassland and Environment Science,Xinjiang Agricultural University,Urumqi,Xinjiang 830052,China)  
The effect of nitrogen fertilizer and planting density on dry matter accumulation,nitrogen absorption,accumulation and distribution of alfalfa organ and seed yield was studied through field experiments.Results showed that the high level of nitrogen and low planting density(N3D1) enhanced dry matter and nitrogen accumulation of each organ.Nitrogen accumulation was varied for different nitrogen levels and planting densities.Stem was the main organ of nitrogen accumulation in the treatment of high planting density and low or medium nitrogen level.However,nitrogen mainly accumulated in flower pods in the treatment of low planting density and high nitrogen level.Dry matter and nitrogen accumulation increased with nitrogen level increasing.The highest dry matter and nitrogen accumulation were tested in treatment N3D1 compared with others.The average contents of dry matter accumulation in root,stem,leaf and flower pod of treatment N3D1 were 8.65,19.02,2.35 and 5.98 g·plant-1,respectively.Nitrogen contents in each organ were12.23,15.01,3.62,15.70 mg·plant-1,respectively.The optimal nitrogen application level and planting density were 150 and 3 kg·hm-2.Under the optimal condition,the seed yield of alfalfa can reached 740.36 kg·hm-2.
【Fund】: “十一五”国家牧草产业技术体系资助;; 牧草良种繁育技术开发与试验示范资助;; 新疆自治区土壤学重点学科资助项目资助
【CateGory Index】: S541.9
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