A generalization of ordinary yield response functions

In an integrated model study of economics and ecology by Vatn et al. (1996), year specific expressions for crop yield response as a function of N-fertilization constituted an important link between the economic and ecological models. It was recognized, however, that data were too few to uniquely est...

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Veröffentlicht in:Ecological modelling 1998-05, Vol.108 (1), p.227-236
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description In an integrated model study of economics and ecology by Vatn et al. (1996), year specific expressions for crop yield response as a function of N-fertilization constituted an important link between the economic and ecological models. It was recognized, however, that data were too few to uniquely estimate yield response functions in all desired simulation scenarios. In future model studies of this type, however, this problem can be reduced by using a generalization of ordinary yield response functions. An ordinary yield function and a generalized yield function were based on a modified version of the Michaelis–Menten equation, where the generalized type of yield function is taking account of the observed differences between years as to how the yield respond to nitrogen fertilizer. Measurements of dry matter in harvested barley grain from field experiments in south-east Norway (1970–1988) were used for parameter estimation and the predictive power was evaluated by cross validation. Based on the prize of grains and nitrogen fertilizers, both yield functions were used to calculate the expected economic optimum amount of N-fertilizer. The particular advantage of using a physiologically grounded functional relationship like the Michaelis–Menten equation, drawbacks and strengths of the two types of yield functions, and the use of dynamic crop-growth models to generate simulated data points of yield dry weight, for use in situations where real observations are few or completely unavailable, are discussed.
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ispartof Ecological modelling, 1998-05, Vol.108 (1), p.227-236
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subjects Agronomy. Soil science and plant productions
APLICACION DE ABONOS
Biological and medical sciences
CARACTERES DE RENDIMIENTO
Climatic parameters
COMPOSANTE DE RENDEMENT
CROP YIELD
Cross validation
ECOLOGIA
ECOLOGIE
ECOLOGY
ECONOMIA
Economic optimum N-fertilization
ECONOMICS
ECONOMIE
FERTILISATION
FERTILIZER APPLICATION
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Generalized yield response
Michaelis–Menten equation
MODELE
MODELOS
Nitrogen fertilization
Nitrogen, phosphorus, potassium fertilizations
RENDEMENT DES CULTURES
RENDIMIENTO DE CULTIVOS
Soil-plant relationships. Soil fertility. Fertilization. Amendments
YIELD COMPONENTS
title A generalization of ordinary yield response functions
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