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This article in AJ

  1. Vol. 83 No. 4, p. 769-773
     
    Received: June 25, 1990
    Published: July, 1991


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doi:10.2134/agronj1991.00021962008300040023x

Functions of Crop Yield from Applied Water

  1. Otto J. Helweg 
  1. Dep. of Civil Engineering, Memphis State Univ., Memphis, TN 38152

Abstract

Abstract

Although there is no unique crop water production function (yield vs. applied water), curves of general functional relationships have utility and are commonly presented in the literature. Some crop production functions used in research and practice are assumed to be linear. Other functions are assumed to be quadratic, or less frequently some other non-linear form. Though these functions may be adequate for the purpose for which they are used, they do not always produce a realistic shape. As the need to know and display the correct shape of the function becomes greater, an improved mathematical expression of the function is required. The criteria of a desirable production function includes being robust as well as accurately fitting the data. Evaluation of several popular functions showed that the Meixner functional series accurately modeled the water-yield relationship of wheat (Triticum aestivum L.) from an experimental plot in Saudi Arabia.

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