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Variation in Marginal Response to Nitrogen Fertilizer between Locations

Published online by Cambridge University Press:  28 April 2015

Dale K. Graybeal
Dale K. Graybeal*
Affiliation:
North Carolina State University
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Abstract

A logistic growth equation with time and location varying parameters was used to model corn response to applied nitrogen. A nonlinear dummy-variable regression model provided a parsimonious representation of site and time effects on parameter values. The model was used to test for the equality of the mean marginal product of nitrogen fertilizer between locations on the coastal plain of North Carolina. Monte Carlo simulation and bootstrap simulation were used to construct finite sample covariance estimates. Results support rejection of the hypothesis that mean marginal products are equal when nitrogen is applied at 168 kg/ac. A comparison of bootstrapped errors and asymptotic errors suggests that results based on asymptotic theory are fairly reliable in this case.

Keywords

bootstrapcorn yieldmarginal productnitrogen fertilizernonlinear regressionC200C150Q100
Type
Invited Paper Sessions
Information
Journal of Agricultural and Applied Economics , Volume 32 , Issue 2 , August 2000 , pp. 363 - 372
Copyright
Copyright © Southern Agricultural Economics Association 2000

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