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ABSTRACT
A study was begun at Temple, Texas, in 1972 to assess the effect of narrow (50-cm) and conventional (100-cm) row spacing of grain sorghum [Sorghum bicolor (L.) Moench] on runoff and erosion from field-sized areas. Sorghum in narrow rows established a more complete plant canopy earlier than sorghum with conventional row spacing and provided more ground cover for much of the growing season. In 1973, runoff was 45% less and soil loss was 39% less from narrow-row grain sorghum than from sorghum with conventional row spacing. Narrow-row spacing of sorghum increased ground cover significantly (5% level) 35 days after emergence in 1974. Canopy cover was at maximum by 63 days after seedling emergence and provided a ground cover of 46 and 81% for sorghum with 100- and 50-cm row spacing, respectively.
1 Contribution from the USDA, Science and Education Administration, Federal Research, in cooperation with Texas Agric. Exp. Stn., Texas A&M Univ.
2 Soil Scientist, Agricultural Engineer, and Soil Scientist, respectively, USDA, SEA, FR, Grassland, Soil and Water Research Laboratory, P. O. Box 748, Temple, TX 76501.
Received for publication June 3, 1978. Accepted for publication July 21, 1978.
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