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Effect of Nitrogen Fertilization on Yield and Protein Content of Grain Sorghum in the Lower Rio Grande Valley of Texas¹

Synopsis: In a field experiment with grain sorghum, applications of 60 and 120 pounds per acre of nitrogen gave significant increases in both content and yield of protein in the grain and forage. Apparent nitrogen recovery was 83.2 and 89.6%, respectively, when 60 and 120 pounds of nitrogen per acre were applied.

² Respectively, Associate Agronomist and Superintendent, Lower Rio Grande Valley Experiment Station, Weslaco, Tex.; and Manager, Crop Experiment Department, Rio Farms, Inc., Edcouch, Tex. The authors wish to acknowledge the service rendered by J. F. Fudge, State Chemist, in having all chemical analyses run in the State Chemist Laboratories at College Station, Tex.

Received for publication August 20, 1956.