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Synopsis: This study indicated that sorghum yields can be predicted from nitrate analyses. A sampling depth of 4 feet seems necessary. Soil tests for N are of limited value in semiarid or arid areas without irrigation. Near maximum yields were obtained from 140 pounds of nitrate or nitrate plus fertilizer N per acre.
2 Soil Scientists, Bushland, Texas, and Fort Collins, Colorado, and Agricultural Engineers, Fort Collins, Colorado, and Bushland, Texas, respectively, Western Soil and Water Management Research Branch, SWCRD, ARS, USDA.
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