University of California

Avocado and citrus orchards along the coast may use less water


Mark E. Grismer
Richard L. Snyder
Ben A. Faber

Authors Affiliations

M.E. Grismer is Professor and Agricultural Drainage Engineer; R.L. Snyder is Biometeorologist, Department of Land, Air and Water Resources, UC Davis; B.A. Faber is Soil and Water Extension Advisor, UC Cooperative Extension, Ventura County.

Publication Information

Hilgardia 54(3):25-29. DOI:10.3733/ca.v054n03p25. May 2000.

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Most citrus and avocado water-use studies have been conducted in inland orchards; however, orchards located in coastal areas are subject to cooler temperatures and foggier atmospheric conditions. To develop coastal area crop coefficients (Kc values) for irrigation management, we measured orchard consumptive water use (ETc) from two different commercial orchards located near Ventura. In addition to coastal climate variability, the ETc measurements were complicated by the wide variability in field soil, slope and elevation. On average, we measured Kc values of 0.46 for young lemons, 0.52 for mature lemons and 0.64 for mature avocados. These values were slightly less than those published, perhaps as a result of greater fog conditions in the orchards as compared to those occurring at the nearest reference ET stations.


Angus DE, Watts PJ. Evapotranspiration — how good is the Bowen ratio method?. Agri Water Mgmt. 1984. 8:133-50. https://doi.org/10.1016/0378-3774(84)90050-7

Grismer ME. Long-term evapotranspiration from a coastal avocado/citrus orchard. ASCE J Irrig & Drain Engr. 2000. 126(1):1-7. https://doi.org/10.1061/(ASCE)0733-9437(2000)126:1(1) PubMed PMID: 18335486

Hydrology Handbook. ASCE Manuals on Engineering Practice No. 28, 2nd Ed. 1996. New York: ASCE.

Lahav ER, Kalmar D. Water requirements of avocado in Israel. II. Influence on yield, fruit growth and oil content. Austral J Agri Res. 1977. 28:869-77. https://doi.org/10.1071/AR9770869

Lahav ER, Steinhardt G, Kalmar D. Water requirements and the effect of salinity in an avocado orchard on clay soil. Proceedings of 2nd World Avocado Congress, 1992. 30.

Marsh AW, Gustafson CD, Davis S, et al. Water use by drip and sprinkle irrigated avocados related to plant cover, evaporation and area temperature. Conference paper from 2nd International Drip Irrigation Conference 1974.

Olalla L, Salazar A, Mira A, et al. The response of avocado trees in the south of Spain to different irrigation regimes and wetted areas. Proceedings of 2nd World Avocado Congress 1992. 22.

Richards SJ, Moore PW, Bingharn FT, et al. Avocado irrigation and nitrogen fertilization plots at the Citrus Experiment Station. California Avocado Society Yearbook. 1958. 42:25-9.

Grismer M, Snyder R, Faber B. 2000. Avocado and citrus orchards along the coast may use less water. Hilgardia 54(3):25-29. DOI:10.3733/ca.v054n03p25
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