New crop coefficients estimate water use of vegetables, row crops
AuthorsStephen R. Grattan
Richard L. Snyder
John J. Carroll
Authors AffiliationsS.R. Grattan is Plant-Water Relations Specialist, Hydrologic Science in the Department of Land, Air and Water Resources, UC Davis; W. Bowers Postgraduate Researchers, Department of LAWR, UC Davis; A. Dong Postgraduate Researchers, Department of LAWR, UC Davis; R.L. Snyder is Biometerologist in the Department of Land, Air and Water Resources, UC Davis; J.J. Carroll is Professor Atmospheric Science in the Department of Land, Air and Water Resources, UC Davis; W. George Postgraduate Researchers, Department of LAWR, UC Davis.
Hilgardia 52(1):16-21. DOI:10.3733/ca.v052n01p16. January 1998.
To estimate the water use of vegetable and row crops, crop coefficients were developed using portable Bowen ratio instruments that were constructed and tested against lysimeters. These instruments measured evapotranspiration (ET) in fields of vegetable and row crops at various developmental stages. The crop coefficient was calculated at different percentages of ground cover using a direct ratio between the ET of the crop and that of a reference grass, which was calculated using meteorological data calculated from local CIMIS weather stations. The crop coefficients for most of the crops increased as the percentage of ground cover increased.
Doorenbos J, Pruitt WO. Guidelines for predicting crop water requirements. Irrigation and Drainage Paper 24 1977. Rome: U.N. Food and Agriculture Organization. 144.
Gallardo M, Snyder RL, Schulbach K, et al. Crop growth and water use model for lettuce. J Irrig and Drain Engin. 1996. 122(6):354-9. https://doi.org/10.1061/(ASCE)0733-9437(1996)122:6(354)
Grattan SR. Adaptive research for the California Irrigation Management System. Project C. Final Report submitted to the California Department of Water Resources 1988. 152. Office of Water Conservation. Contract # B55428.
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