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Using A Subsurface Drip Irrigation System To Measure Crop Water Use, William R. Detar
Using A Subsurface Drip Irrigation System To Measure Crop Water Use, William R. Detar
William R DeTar
Procedures are presented for determining crop water use and crop coefficients for a row crop, using a neutron scattering probe with an efficient subsurface drip irrigation system. One procedure is called the slopeprojection method, and the other is called a covariance procedure. Field tests were conducted with full-season, narrow-row cotton (Gossypium hirsutum L.) on a well-drained, sandy soil in a semi-arid environment over a 5-year period. The goal was to improve automated irrigation scheduling, by relating evapotranspiration (ET) to growing degree days (GDD). The result, using a Penman-Monteith reference ET, was an average mid-season crop coefficient of 1.11, with a …