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《Journal of Nuclear Agricultural Sciences》 2015-07
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Effects of Nitrogen Application on Nitrogen Metabolism and Nitrogen Accumulation of Alfalfa( Medicago Sativa)

LIU Xiaojing;ZHANG Jinxia;YE Fang;QI Peng;College of Pratacultural Science,Gansu Agricultural University;Key Laboratory of Grassland Ecosystem,Ministry of Education/Sino-U. S. Centers for Grazingland Ecosystem Sustainability;College of Resource and Environment,Gansu Agricultural University;  
The alfalfa( Medicaga sativa Gannong No. 3) growing in second year was used to study its nitrogen metabolism and nitrogen accumulation under different nitrogen application levels( 0( CK),51. 75,103. 5 kg·hm- 2) and different mowing times. The results showed that compared with CK,the nitrogen treatments significantly( P 0. 05) increased the activity of nitrate reductase( NR),glutamine synthetase( GS) and transaminase( GOT,GPT),and the contents of soluble protein and total protein in leaves. The activity of tested nitrogen metabolism enzymes reached thehighest when nitrogen application level was 103. 5 kg·hm2. Correlation analysis showed that the relationship between nitrogen application level( x) and total protein content( y) follow a quadratic equation y =- 0. 113 x2+ 53. 632 x + 1 681. 911( R2= 0. 999**). And the nitrogen accumulation positively correlated to nitrogen metabolism activity and soluble protein content( P 0. 05),This suggested that nitrogen fertilization could promote the activity of nitrogen metabolism enzyme.
【Fund】: 国家自然科学基金项目(31460622);; 公益性行业(农业)科研专项(201403048-8);; 甘肃省财政厅项目“外源氮素供应对紫花苜蓿产量和品质形成影响研究”
【CateGory Index】: S541.9
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