Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 January 1973
Published in Agron J 65:37-41 (1973)
© 1973 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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A Model for Estimating Desired Levels of Nitrate-N Concentration in Cotton Petioles1

Donald W. Grimes, W. L. Dickens, H. Yamada and R. J. Miller2

Field studies were conducted on two widely different soils over a 3-year period in a semiarid irrigated region to establish functional relations between responses of cotton (Gossypium hirsutum L) plants and the major production input factors: water, nitrogen, and plant density.

The nitrate-nitrogen concentrations of petioles from the most recently matured leaves were influenced by N-fertilization level, time of sampling in the season, and water management. Plant population did not alter the nitrate.N levels of petioles. High concentrations were associated with large amounts of N applied in side-dress soil applications. On a fine-textured soil with a high water-retention capacity N side-dressed after emergence was not taken up by the plant until the first irrigation was added.

Concentrations of nitrate-N in petioles at critical times in the season were characterized by a 2nd-degree polynomial model having water and nitrogen quantities as independent variables (0.54≤2R≤0.94). A second model was subsequently developed that incorporated time as an independent variable in addition to water and nitrogen quantities. Using a yield equation and model 2, a procedure was developed that enables time-dependent "desired" levels of plant nutrient concentrations to be established that are dependent on commodity price and production factor costs. This model is sensitive to changing price levels for commodity and/or production factors.

Key Words: Plant response functions • Water management • "Desired" nutrient concentrations

1 Contribution from the Department of Water Science and Engineering, and Field Stations, University of California, Davis 95616. This work was supported by a grant from the Calif. Planting Cotton Seed Distributors and contract from Iowa State University (U.S. Bureau of Reclamation). Presented before Div. S-4 of the Soil Sci. Soc. of Amer., August 1970.

2 Associate Water Scientist, Staff Research Associates, and Associate Water Scientist, respectively.

Received for publication April 3, 1972.




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Environmental Quality		 The Plant Genome
Copyright © 1973 by the American Society of Agronomy.