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Foliar Feeding of Corn with Urea Nitrogen¹

ABSTRACT

The application of supplemental nitrogen to corn by the use of urea foliar sprays was investigated. Injury in the form of marginal leaf burn was dependent upon both the concentration of the solution and the rate of application. The amount of injury could also be modified by additions of sugar, calcium hydroxide and potassium bicarbonate. Yield response of corn to foliar applied nitrogen was no greater than to the same amount of nitrogen applied as a side dressing. When injury occurred the yield response was reduced. The cause of the marginal leaf burn was investigated. Ammonia or nitrites did not appear to cause the injury. It was postulated that some product or a number of products of ammonia metabolism caused the injury. The beneficial effect of sucrose was believed to be due to the decreased rate of urea absorption and an increased rate of urea translocation within the plant.

¹ Journal Paper No. 674 Purdue Univ. Agr. Exp. Sta., Lafayette, Ind. Contribution from the Dept. of Agronomy. Presented before Section IV Soil Science Society of America, Cincinnati, Ohio, Nov. 21, 1952.

² Graduate Fellow, Agr. Exp. Sta., Purdue Univ.; Former Graduate Fellow, Purdue Univ., now Head of Soil Technology Section, Centro Nacional de Agromia, El Salvador; and Associate Professor in Agronomy, Purdue Univ.