Historical reference crop ET reliable for irrigation scheduling during summer
AuthorsBlaine R. Hanson
Authors AffiliationsB.R. Hanson is Irrigation and Drainage Specialist, Department of Land, Air and Water Resources, UC Davis; K. Kaita is Staff Research Associate, Department of Land, Air and Water Resources, UC Davis.
Hilgardia 53(4):32-36. DOI:10.3733/ca.v053n04p32. July 1999.
Average daily historical reference crop evapotranspiration was calculated using 13 to 15 years of daily evapotranspiration from 10 sites in California. Maximum average values, generally occurring in June, ranged between 0.25 and 0.32 inches per day at most of the sites. Absolute percent relative errors were minimum during July and August, ranging between 5% and 13% for all but one site. About 25% to 35% of the variation in the historical data reflected year-to-year variation; the remaining variation was due to seasonal trend and variability about the seasonal trend. To prevent overirrigation or underirrigation during deviation from the historical evapotranspiration value, growers should monitor soil moisture or check real-time evapotranspiration.
Also in this issue:Habitats and dispersal of the principal leafhopper vectors of Pierce’s Disease in the San Joaquin Valley
California-Catalonia connection enriches research
Imported fire ants carry high price
Persea mite, thrips threaten avocados
CALFED publishes preferred options for Bay-Delta
Ecosystem health subject of landmark gathering
Organic cotton finding a niche in northern San Joaquin
Preliminary studies show yield and quality potential of organic cotton
Water relations of lysimeter-grown peach trees are sensitive to deficit irrigation
Continuous trunk diameter recording can reveal water stress in peach trees
X. fragariae and C. cladosporioides cause strawberry blossom blight
Kiwifruit size influences softening rate during storage
Organic matter recycling varies with crops grown