Abstract
Abstract Water and nitrogen loss from field soil cropped to head lettuce with furrow irrigation was measured during three seasons in a semi-arid region. Water applications were reduced during the latter ⅓ of the growth period in an attempt to conserve N and water in the root zone. Approximately 5 acre feet of water was applied to grow the crop. One-fifth of the applied water drained off and one-half percolated below the root zone. Eighty-nine lb./acre of NO3-N was leached. Two-thirds of the water and three-fourths of the N (soil and applied) which were lost below the root zone were lost during germination. Reducing the total volume of water applied by 1½ acre feet did not reduce water or N loss appreciably and had a deleterious effect on the crop. Very little N was lost as a result of runoff, but much was moved to the bed tops after the first irrigation. Implications of these findings are discussed.
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