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对目标产量施肥模型特点、弊端和预测施肥量精度等进行了综合研究,并与生态平衡施肥模型进行了比较。结果表明:尽管目标产量施肥模型构建合理,参数获得容易,但参数多,参数易变,参数准确测定困难,参数间存在相互影响关系,模型中没有考虑土壤有效养分平衡或变化,因此,它难以作为精确施肥模型使用;与其相比,生态平衡施肥模型将施肥系统中诸多变量统一在质量守恒定律之下,具有测土施肥模型和肥料效应函数模型的双重功能,参数变异小,参数易于获得和预测施肥量准确等诸多优点。
The characteristics of the target yield fertilization model, the disadvantages and the forecast fertilization accuracy were comprehensively studied and compared with the ecological balance fertilization model. The results showed that although the fertilization model of the target yield was reasonable and the parameters were easy to obtain, it was difficult to determine the fertile soil parameters due to the many parameters, the variable parameters, the difficult parameter determination and the mutual influence between the parameters. Compared with the model, the ecological balance fertilization model unifies many variables in the fertilization system under the law of conservation of mass, and has the dual functions of soil fertilization model and fertilizer effect function model. The parameter variation is small, the parameters are easy to obtain and Predict the amount of fertilizer and many other advantages.