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Calculation of Optimal Fertilizer Rates: A Comparison of Three Response Models†

Calculation of Optimal Fertilizer Rates: A Comparison of Three Response Models† Determination of optimal N‐fertilization rates, NOR, for crop production that minimize risk of environmental degradation require accurate application of a response model. Several models are available to describe crop yield response to N fertilization. The objective of this work was to compare the relative accuracy of a quadratic, f(NQ), a modified Mitscherlich, and tanh(N) models on 48 data sets. Data were collected from a Tara silt loam (fine‐silty, mixed, frigid Pachic Udic Haploboroll) over a 6‐year period using two maize (Zea mays L.) hybrids and four tillage treatments, mouldboard plough, chisel plough, ridge tillage and no‐tillage. In about one‐third of the cases, all models performed about equally well. Generally, the tanh(N) and modified Mitscherlich models gave better fit between N rate and grain yield data. The NOR, ranged from about 140 to 170 kg ha−1 for the modified Mitscherlich model, 136 to 184 kg ha−1 for the tanh(N) function, and 124 to 173 kg ha−1 using the f(NQ) model. Estimated grain yields at these rates ranged between 6.58 ± 1.30 to 7.59 ± 1.69 Mg ha−1 for the 90‐day Minnesota maturity rated (MR) hybrid and between 7.52 ± 2.40 to 8.72 ± 1.70 Mg ha−1 for the 95‐day MR hybrid. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Agronomy and Crop Science Wiley

Calculation of Optimal Fertilizer Rates: A Comparison of Three Response Models†

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References (20)

Publisher
Wiley
Copyright
Copyright © 1998 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0931-2250
eISSN
1439-037X
DOI
10.1111/j.1439-037X.1998.tb00527.x
Publisher site
See Article on Publisher Site

Abstract

Determination of optimal N‐fertilization rates, NOR, for crop production that minimize risk of environmental degradation require accurate application of a response model. Several models are available to describe crop yield response to N fertilization. The objective of this work was to compare the relative accuracy of a quadratic, f(NQ), a modified Mitscherlich, and tanh(N) models on 48 data sets. Data were collected from a Tara silt loam (fine‐silty, mixed, frigid Pachic Udic Haploboroll) over a 6‐year period using two maize (Zea mays L.) hybrids and four tillage treatments, mouldboard plough, chisel plough, ridge tillage and no‐tillage. In about one‐third of the cases, all models performed about equally well. Generally, the tanh(N) and modified Mitscherlich models gave better fit between N rate and grain yield data. The NOR, ranged from about 140 to 170 kg ha−1 for the modified Mitscherlich model, 136 to 184 kg ha−1 for the tanh(N) function, and 124 to 173 kg ha−1 using the f(NQ) model. Estimated grain yields at these rates ranged between 6.58 ± 1.30 to 7.59 ± 1.69 Mg ha−1 for the 90‐day Minnesota maturity rated (MR) hybrid and between 7.52 ± 2.40 to 8.72 ± 1.70 Mg ha−1 for the 95‐day MR hybrid.

Journal

Journal of Agronomy and Crop Science – Wiley

Published: Jun 1, 1998

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