Abstract
Leaching requirement, defined as the minimum leaching fraction that maintains full crop production, was determined in field plots at the U.S. Salinity Laboratory for three crops; oat, tomato, and cauliflower. Six replicated leaching-fraction treatments were pulse-irrigated daily with water having an electrical conductivity of 2.1 dS/m. All three crops were grown in rotation during 1977 and 1978 with a third tomato crop in 1979. The leaching requirement ( L r) was 0.10 for oat grain, 0.21 for tomato fruit, and 0.17 for cauliflower heads. For oat forage, the L r was more than 0.17. These values agree closely with those predicted by a leaching-requirement model based on an exponential crop water-uptake pattern. Evapotranspiration during each crop's growing season coincident with the leaching requirement was 390, 850, and 230 mm for oat, tomato, and cauliflower, respectively.
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