Microsprinklers wet larger soil volume; boost almond yield, tree growth
AuthorsLarry J. Schwankl
John P. Edstrom
Jan W. Hopmans
Kouman S. Koumanov
Authors AffiliationsL. Schwankl is UCCE Irrigation Specialist Department of Land, Air, and Water Resources, Hydrologic Sciences, UC Davis; J. Edstrom is Pomology Farm Advisor, UCCE Colusa County; J. Hopmans is Professor, Department of Land, Air, and Water Resources, Hydrologic Sciences, UC Davis; L. Andreu is Water Management Researcher located at the University of Seville, Spain; K.S. Koumanov is Water Management Researcher at the Fruit Growing Institute, Plovdiv, Bulgaria.
Hilgardia 53(2):39-43. DOI:10.3733/ca.v053n02p39. March 1999.
In the Arbuckle area of the Sacramento Valley, a 22-acre orchard was planted in 1990 with four almond varieties (‘Nonpareil’, ‘Butte’, ‘Carmel’ and ‘Monterey’). The orchard was irrigated with three types of microirrigation — surface drip, subsurface drip and microsprinklers. The orchard soils are 3 to 4 feet of gravelly, loamy sand overlaying a restricting clay layer. The coarse-textured soil with its low water-holding capacity allows little lateral movement of water from the microirrigation emission device. Under these soil conditions, microsprinkler-irrigated trees produced larger almond yields and showed greater tree growth. In addition, irrigation system evaluations show that all three microirrigation systems provide excellent irrigation uniformity levels after 8 years of operation with only routine maintenance.
Andreu L, Hopmans JW, Schwankl LJ. Spatial and temporal distribution of soil water balance for a drip-irrigated almond tree. Agric Water Management. 1997. 35:123-46. https://doi.org/10.1016/S0378-3774(97)00018-8
Koumanov KS, Hopmans JW, Schwankl LJ, et al. Application efficiency of microsprinkler irrigation of almond trees. Agric Water Management. 1997. 34:247-63. https://doi.org/10.1016/S0378-3774(97)00030-9
Schwankl LJ, Edstrom JP, Hopmans JW. Performance of microirrigation systems in almonds. Proceedings of 7th International Conference on Water and Irrigation 1996. Tel Aviv, Israel:
University of California, Division of Agriculture and Natural Resources. Using Reference Evapotranspiration (Eto) and Crop Coefficients to Estimate Crop Evapotranspiration (Etc) for Trees and Vines. Leaflet 21428 1989.
Also in this issue:Biological studies of iceplant scales, Pulvinariella Mesembryanthemi and Pulvinaria delottoi (Homoptera: Coccidae), in California
Expanded efforts needed to limit exotic pests
Introduction Special section: exotic pest update
AHB headed to Central Valley?
Fire ant invades Southern California
Medfly - going but not gone
Can integrated methods stop starthistle?
Two new seed head flies attack yellow starthistle
New growth regulator herbicide provides excellent control of yellow starthistle
Success of mowing to control yellow starthistle depends on timing and plant's branching form
A new sharpshooter threatens both crops and ornamentals
Glassy-winged sharpshooters expected to increase plant disease
Early results suggest sterile flies may protect S. California from medfly
Geographic races may exist among perennial grasses
Improving irrigation systems conserves water in greenhouse-grown cut flowers