Hilgardia
Hilgardia
Hilgardia
University of California
Hilgardia

Cover crops, mulch lower night temperatures in citrus

Authors

Neil V. O'Connell
Richard L. Snyder

Authors Affiliations

N.V. O'Connell is Farm Advisor, UC Cooperative Extension, Tulare County; R.L. Snyder is Biometeorology Specialist, UC Davis.

Publication Information

Hilgardia 53(5):37-40. DOI:10.3733/ca.v053n05p37. September 1999.

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Abstract

Winter often brings cold temperatures that can damage fruit or foliage in the San Joaquin Valley, posing an economic threat to citrus producers. Our experiments show that cover crops or mulch can lower minimum nighttime temperatures 0.90F to 2.20F in orchards, increasing the threat of freeze (frost) damage. Wind machines are typically used to protect commercial acreage from frost by mixing warmer air aloft with colder air near the surface, thus maintaining warmer minimum temperatures within the orchard. In locations where wind machines are not cost effective, management of the orchard floor is even more important. By using temperature forecast models that adjust for cover crops and mulches, growers can use wind machines more efficiently. Regardless, the decision to use cover crops must take into account all of their cultural benefits and drawbacks.

References

Cochran PH, Boersma L, Youngberg CT. Thermal properties of a pumice soil. Soil Sci Soc Amer Proc. 1967. 31:454-9.

Donaldson DR, Snyder RL, Elmore C, Gallagher S. Weed control influences vineyard minimum temperature. Amer J Enol & Vitic. 1993. 44(4):431-4.

Fritton DD, Martsolf JD. Solar energy, soil management and frost protection. Hort Sci. 1981. 3:205-

Fritton DD, Martsolf JD, Busscher WJ. Spatial distribution of soil heat flux under a sour cherry tree. Soil Sci Soc Amer J. 1976. 40:644-7.

Gradwell MW. Overnight heat losses from the soil in relation to its density. New Zealand J Sci. 1963. 6:463-73.

Pehrson JE. Groundcovers and orchard temperatures. Citrograph. 1989. 75:14-

Snyder HL, Connell J. Groundcover height affects predawn orchard floor temperature. Cal Ag. 1993. 47(1):9-12.

Snyder RL, Pruitt WO. Evapotranspiration data management in California. Session Proceedings/Water Forum 1992, ASCE. Baltimore, MD/Aug. 2-6, 1992 1992.

O'Connell N, Snyder R. 1999. Cover crops, mulch lower night temperatures in citrus. Hilgardia 53(5):37-40. DOI:10.3733/ca.v053n05p37
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