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Model of Soil Salinity Effects on Crop Growth¹

ABSTRACT

The model considers properties of the soil, water, plant, and atmospheric system to predict relative crop yield. Crop yield predictions assume a direct relation between dry matter production and transpiration. The only salinity effects considered are osmotic potential. The influence of initial soil salinity on crop growth depended upon the crop type and irrigation management. Predictions made of salt buildup over several years show that some water management systems would produce high yields for several years before salt buildup would decrease yields. Predictions show that the influence of irrigation system uniformity on salinity buildup and yield reduction is very important.

¹ Contribution from Utah State University, Department of Soil Science and Biometeorology, in cooperation with Utah Agric. Exp. Sta., Logan, Utah 84322. Journal Paper no. 1920. Supported in part by Grant A-018, Utah Center for Water Resources Research, Office of Water Resources Research, USDI and Grant no. S801040, Program Element 1BB039, Office of Research and Monitoring, US Environmental Protection Agency.

² Graduate Research Assistant and Professor, respectively, Utah State University.

Received for publication January 22, 1975. Accepted for publication April 1, 1975.

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