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Effect of NPK Application on Yield,Nutrients and Water Utilization Under sudangrass and ryegrass rotation Regime

Agricultural Sciences in China 2010年第7期9卷 1026-1034页

作者： LI Wen-xi LU Jian-wei CHEN Fang LI Xiao-kun College of Resources and Environment Huazhong Agricultural University Wuhan 430070 P.R.China Wuhan Botanical Garden Chinese Academy of Sciences Wuhan 430074 P.R.China

sudangrass and ryegrass rotation is a new type of cropping system in Jianghan Plain,which develops very fast in recent ***,it is essential to work out the optimal nutrients and water management measures in this new *** effect of NPK fertilizer on yield of forage grass,nutrients and water utilization under sudangrass and ryegrass rotation was studied through continuous pot experiments for three *** results showed that NPK combination could significantly improve the yield of forage *** total yields during the periods of 2005-2006,2006-2007 and 2007-2008 were 1 690.0,2 091.3 and 1 770.7 g/pot,*** yields in PK treatment were 700.7,1 256.9 and 856.3% lower than those of NPK treatment,while the yields in NK treatment were 426.3,384.9 and 792.3% lower than those of NPK treatment,***,the yields in NP treatment were 15.9,4.4 and 10.6% lower than those of NPK treatment,*** NPK combination was found to improve the nutrients uptake,and the total N uptakes during the above periods were 10.0,14.8 and 10.6 times higher than that of PK treatment,respectively,and 3.7,1.8 and 5.1 times higher than those of NK treatment,respectively,but,were similar to NP *** total P uptakes were 4.6,6.8 and 5.3 times higher than those of PK treatment,and were 2.4,2.3 and 2.9 times higher than those of NK treatment,respectively,but were similar to NP *** total K uptakes were 5.2,8.4 and 4.9 times higher than that of PK treatment,3.9,2.3 and 3.9 times higher than those of NK treatment,and 80.9,57.4 and 200.5% higher than those of NP treatment,*** productivity for three years time periods were 16.5,16.1 and 16.2 kg m-3,and were 3.8,5.4 and 4.2 times higher than those of PK treatment,2.3,1.3 and 2.6 times higher than those of NK treatment,and were 16.4,8.8 and 22.4% higher than those of NP treatment,*** soil pH was decreased and soil organic matter was increased in all treatments with in

关键词： sudangrass and ryegrass rotation system NPK fertilizer nutrient uptake water productivity soil nutrition

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