稻作施肥制度进步的产量响应

Output response to fertilization development in rice cropping

  • 摘要: 模拟稻作l0种施肥制度9年定位观测与试验研究结果表明,施肥进步对产量贡献为生物量增加1倍,稻谷产量增加83% ;系统养分内循环(循环率0.8~0.5)产量贡献率为57.9% ,化肥施用最大贡献率N为20 4% ,NP为30.8% ,NK为32.8% ,NPK为61.3% ,有机肥与无机肥配施的最大贡献率82.7% ,稻田自然生产力占系统生产力约1/4。石油化学农业能维持一定时期的生产力稳定,但必须保持系统的养分平衡。系统养分内循环有良好的产量增益和系统生产力的稳定性,有机肥与无机肥配施其生物生产力和土地生产潜力均呈正向发展;但与施肥增产效率戎反比例。稻怍施肥质量达到一定水平时,施肥增产效益反而有所下降,伴随施肥进步,须致力于管理水平的提高。

     

    Abstract: Fertilization was control instrument of productivity of cropland system .Simulation of ten kinds of fertilization systems of rice cropping shows that the fertilizing progress can double the biomass and increase the paddy by 83% .N utrient in the system contributes 57.9% of the output. the contributions of fertilizing are as follows:N is 20.4% ,NP 30.8% .NK 32.8% .NPK 61.3% and combination of organic and inorganic fertilizers 82.7% respectively.Nature conductivity is 1/4 of the system conductivity or so.Petrochemical agriculture can maintain the conductivity in a period of time at the condition of nutrient balance and the conductivities of inorganic transform to organic and the nutrient inner circulation in the system have favorable output and the impact on system stabilization.The combination of organic-inorganic can not only improve the conductivity but also the potential conductivity of the fertilizing combination,the benefit of fertilization declines after some degrees of fertilization.Accompanying by fertilizing progress,improving the management is also important.

     

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