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Crop Input Response Functions with Stochastic Plateaus

2008; Wiley; Volume: 90; Issue: 2 Linguagem: Inglês

10.1111/j.1467-8276.2007.01123.x

1467-8276

Gelson Tembo, B. Wade Brorsen, Francis M. Epplin, Emílio Tostão,

Agricultural Economics and Policy

Abstract Agronomic research on crop response to nitrogen fertilizer suggests that a plateau function may be appropriate, but the plateau varies across fields and years. Available models that treat the plateau as a stochastic variable are not readily extendable to handle field or year random effects as seems to be appropriate based on the agronomic data. This article develops a method of estimating a response function with a stochastic plateau that can capture random effects. The method is then used to determine economically optimal levels of nitrogen fertilizer for wheat ( Triticum aestivum ).