Estimation of Optimum Nitrogen Fertilizer Rates in Winter Wheat in Humid Mediterranean Conditions. I. Selection of Yield and Protein Response Models

Nitrogen (N) fertilization management directly affects yield and grain protein content of soft red winter wheat, so there is a need to estimate the optimum N fertilizer dose needed to obtain the greatest yield and the desired protein content under a humid Mediterranean climate. The objective of this...

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Bibliographic Details
Published in:Communications in Soil Science and Plant Analysis 2010-01, Vol.41 (16-19), p.2293-2300
Main Authors: Ortuzar-Iragorri, M.A, Castellon, A, Alonso, A, Besga, G, Estavillo, J.M, Aizpurua, A
Format: Article
Language:English
Subjects:
Agricultural production
Agronomy. Soil science and plant productions
Biological and medical sciences
Cereal
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
grain protein
N fertilizer
Nitrogen, phosphorus, potassium fertilizations
protein response
Soil-plant relationships. Soil fertility. Fertilization. Amendments
Wheat
yield response
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Summary:Nitrogen (N) fertilization management directly affects yield and grain protein content of soft red winter wheat, so there is a need to estimate the optimum N fertilizer dose needed to obtain the greatest yield and the desired protein content under a humid Mediterranean climate. The objective of this work was to select the best response models of wheat yield and protein content to applied N fertilizer. To fulfil this objective, 13 experiments were conducted in the years 2001, 2002, 2003, and 2004 in northern Spain where 0, 100, 140, 180, and 220 kg N ha-1 were applied. The quadratic plateau model best described yield response to N fertilizer, with 182 kg N ha-1 producing the maximum yield. The quadratic model was chosen for modeling protein response to N fertilization, and 176 kg N ha-1 was the rate required for achieving protein contents greater than 125 g kg-1.
ISSN:0010-3624
1532-2416
1532-4133
DOI:10.1080/00103624.2010.508094