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Salinity Profiles and Leaching Fractions for Slowly Permeable Irrigated Field Soils¹

ABSTRACT

The salinity status of four slowly permeable irrigated soils was measured under commercial field conditions to determine the magnitude and variability of actual leaching fractions. Soil cores were taken in 30-cm increments to a 150-cm depth. Assuming a desirable leaching fraction of 15 to 20% for lettuce (Lactuca sativa L.), and 5 to 10% for alfalfa (Medicago sativa L.), cotton (Gossypium hirsutum L.), sugarbeet (Beta vulgaris L.), and wheat (Triticum aestivum L. em Thell.), for nearly all soil-crop combinations, leaching fractions ranged from insufficient to excessive. Median leaching fractions were excessive in Holtville and Indio soils planted to lettuce, sugarbeet, and wheat and insufficient or marginal in Imperial and Meloland soils planted to all crops.

¹ Contribution from Imperial Valley Conservation Research Center, USDA, SEA, Brawley, CA 92227.

² Soil Scientist, Blackland Conservation Research Center, USDA, SEA, Temple, Tex.; Plant Physiologist and Agronomist, Imperial Valley Conservation Research Center, Brawley, Calif., respectively.

Received for publication April 17, 1978. Accepted for publication November 2, 1978.