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Synopsis: Root samples were obtained from 7 depth increments of O to 24 inches on variously fertilized annual range plots. Production of root material was greatest on N-fertilized plots. There was no significant accumulation of roots at any particular depth in response to fertilizer.
2 Assistant Agronomist, Department of Agronomy, University of California, Riverside, (formerly Plant Physiologist, Crops Research Division, ARS, USDA); Assistant Agronomist, Agronomy Department, University of California; and Laboratory Technician IV, Department of Irrigation, University of California (now Soil Scientist, Soil and Water Conservation Research Division, ARS, USDA, Brawley, Calif.).
Received for publication December 11, 1961.
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