A MODEL TO PREDICT CROP RESPONSE TO APPLIED FERTILIZER NUTRIENTS IN HETEROGENEOUS FIELDS

被引：21

作者：

CASSMAN, KG

PLANT, RE

机构：

[1] Department of Agronomy and Range Science, University of California, Davis, 95616, CA

来源：

FERTILIZER RESEARCH | 1992年 / 31卷 / 02期

关键词：

SOIL HETEROGENEITY; SPATIAL VARIABILITY; FERTILIZER USE EFFICIENCY; NITROGEN USE EFFICIENCY; POTASSIUM;

D O I：

10.1007/BF01063289

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

In this paper we develop a model to quantify spatial variability in indigenous soil nutrient supply and assess the impact of this heterogeneity on fertilizer use efficiency with uniform or site-specific nutrient application. Utilizing field data for wheat and rice response to applied N and cotton response to applied K, the model predicts that the magnitude of the difference in the nutrient input requirement of a heterogeneous field for site-specific versus uniform nutrient application depends on (1) a curvilinear crop response to nutrient supply and the mathematical form of the response function, (2) the degree and spatial distribution of the nonuniformity in native soil-nutrient supply as quantified by its variance and skewness, (3) the targeted yield level, and (4) the effectiveness of fertilizer-nutrient addition, quantified by the slope of the relationship between the net increase in actual nutrient supply available to the crop and the quantity of applied nutrient.

引用

页码：151 / 163

页数：13

共 16 条

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