Testing a von Liebig Crop Response Function against Polynomial Specifications
通过非嵌套检验，比较了作物对肥料响应的多项式函数与冯·李比希最小函数两种规格，结果拒绝了多项式类型，支持了最小与平台类型。
Abstract Crop responses to fertilizers traditionally have been specified as polynomial functions. Recently, criticisms were raised against such specifications because they force substitution between nutrients and overestimate the optimal fertilizer quantity. With those criticisms, an alternative crop response function was presented in the form of a minimum function which equates the realized output to the production potential associated with a limiting input. In this paper a nonnested test is performed to discriminate between the two rival specifications. The results of this test reject the hypothesis that a crop response is of the polynomial type, while they do not reject the hypothesis that it is of the minimum and plateau type.