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Model for Estimating Soil Water, Plant, and Atmospheric Interrelations: II. Field Test of Model¹

ABSTRACT

A mathematical model was developed to predict water content profiles, evapotranspiration, water flow from or to the water table, root extraction, and root water potential at the surface under transient conditions.

The model was field tested in 1970 and 1971. With alfalfa (Medicago sativa L.) as the crop, predicted and computed water content-depth profiles show best agreement 48 hours after any water addition. The poorest agreement for all crops tested was right after irrigation.

The computed cumulative upward water flow from the water table was 4.80 cm as compared to 0.0 cm measured for the whole 1971 season of 116 days.

¹ Contribution from the Dep. of Soil Science & Biometeorology, Utah State Univ., Logan, Utah 84322. This work was supported by Utah Agr. Exp. Sta. at Utah State Univ. and the Dep. of Interior, US Environmental Protection Agency under their grants WP-0192-01(n)1 and 13030 FDJ. Utah Agr. Exp. Sta. Journal Paper no. 1302.

² Post Doctoral Fellow, Utah State Water Research Lab., Formerly Research Assistant, Utah State Univ.; and Professor of Soil Physics, Dep. of Soil Science & Biometeorology, Utah State Univ., respectively.

Received for publication October 9, 1972. Accepted for publication March 6, 1973.

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