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作 者 ：胡国智， 张 炎， 李青军， 胡 伟， 孟凤轩， 冯广平

期 刊 ：植物营养与肥料学报 2011年 17卷 2期 页码：397-403

Keywords:nitrogenmanagement, cotton, n,

摘 要 ：通过膜下滴灌田间试验，研究不同氮肥运筹模式对棉花干物质积累、氮素吸收利用及产量的影响。结果表明，各处理棉花干物质及氮素积累均符合Logistic方程；棉花干物质积累最快时期出现在出苗后83～139 d。不同的氮肥运筹可明显影响到棉花氮素吸收最大速率及其出现日期，以有机无机氮肥配施（N2+M）处理的氮素吸收最大速率较高，且其出现日期相对较早。棉株对干物质分配中心与氮素吸收分配中心一致。各施氮处理氮肥利用率在32.11%～49.24%之间，N2+M处理氮肥利用率最高，其它处理氮肥利用率随施氮量的增加而降低。本试验中，N2+M处理产量达1890 kg/hm²，显著高于其它处理。

Abstract:The effects of different nitrogen fertilizer Managements uptake and utilization and yield were studied under field experiment with drip irrigation. The results showed thatthe–139dafter seeding stage. Different managements of nitrogenous fertilizer significantly influenced the maximum N uptake rate and present time. Combine application of organic and inorganic N fertilizer (N2+M) resulted in the maximum N uptake rate and earlier present time. The dry matter distributing center was consistent with that of nitrogen uptake. The nitrogenous fertilizer utilizing rate was ranged between 32.11% and 49.24% and the highest N utilization rate was found under the treatment N2+M. Nitrogen efficiency increased with the reduction of nitrogen application rate. In this experiment, treatment N2+M had the largest yield 1890 kg/ha, which was significantly higher than the others. cotton dry matter and nitrogen accumulation fit the Logistic equation. The fastest dry matter accumulation period occurred in 83on the accumulation of cotton dry matter, N

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