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《Acta Agrestia Sinica》 2007-05
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Study on NPK Fertilizer and Nutrients Utilizing Efficiency under Sudangrass and Ryegrass Rotation Regime in Jianghan Plains

LI Wen-xi1, LU Jian-wei1, LU Jun-ming2, LI Xiao-kun1, JIANG Zhi-ping1 (1.College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei Province 430070, China; 2.Agricultural Technology Center, Datonghu Administration District of Jingzhou City, Jingzhou, Hubei Province 434300, China)  
The NPK combined fertilization and its nutrients utilizing efficiency under Sudangrass-Ryegrass rotation regime were studied by this experiment. The results show that the fresh forage yield of NPK combination treatment increased 123.3 t/hm2, 34.5 t/hm2 and 24.7 t/hm2 more than those of PK, NK and NP treatments, respectively. N, P and K fertilizer evidently improved the yield of fresh forage and dry matter; the increased percentages for fresh grass were 313.1%, 26.9% and 17.9%, and 196.3%, 22.2%和9.7% for dry matter, respectively. NPK combination significantly improved N, P2O5 and K2O uptake by forages, and total uptake rates of three elements in two growing seasons were 500 kg N/hm2, 208 kg P2O5/hm2 and 1196 kg K2O/hm2. The uptake ratio of N, P2O5, and K2O for Sudangrass and Ryegrass were 1∶0.37∶1.96 and 1∶0.50∶3.19 in presence of NPK combination. In the rotation system, nutrient utilizing efficiency (NUE) of N, P and K were 60.0%, 21.7% and 61.6%, respectively. The contribution rates of N, P and K fertilizer to corresponding nutrients assimilated by forage grass were 81.0%, 32.7% and 23.2%, respectively.
【Fund】: 国际植物营养研究所(IPNI)国际合作项目“江汉平原鱼草平衡施肥技术研究”(Hubei-22)
【CateGory Index】: S543.6;S544.1
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