水稻生产的氮肥优化模拟研究

Studies on a numerically optimized fertilizer N model in rice production:

本文阐述了水稻氮肥优化管理模型。模型由水稻干物质积累、植株中氮素运转和分配、植株对氮素的吸收、氮肥吸收、氮肥施用曲线和分次施氮等 6个模块组成 ,其中氮肥施用躯线是在描述氮在作物—土壤系统的复杂行为基础上 ,结合Price(1979)规则系统数学优化 ,制定出给定氮素水平下的模拟产量或纯收入所必需的氮肥优化管理曲线 ,并根据生产实际把氮肥管理曲线转化为实际的分次间歇施氮方案。实践验证结果表明 。

The paper briefly presents the construction of MANGE N model and its application in rice production. The model consists of six modules and Price (1979) algorithm optimization procedure. The six modules include biomass accumulation, nitrogen (N) supply from soil and fertilizer, crop N uptake, N allocation, the cumulative fertilizer N application curve and split evaluation in the rice soil system. When combined with Price (1979) algorithm optimization procedure, the continuous optimized N application curve needed to achieve the attainable grain yield or pure income can be drawn; and split evaluation module is utilized to translate this ideal curve into an actual split dose application scheme. Results of verification trails showed the model recommendation appeared to increase grain yield while reduced total fertilizer N input, comparing with local state recommendation.