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Urea-Formaldehyde Fertilizer as a Source of Nitrogen for Cotton and Corn¹

ABSTRACT

Three formulations of experimental 12-12-12 grade fertilizer, each containing a portion of the nitrogen as ureaformaldehyde, were compared with ammonium nitrate as sources of nitrogen for cotton and corn. The 12-12-12 used in 1955 contained 38% of the nitrogen as urea-formaldehyde with an availability index of 20; in 1956 two formulations were used with urea-formaldehyde percentages of 35 and 36 and availability indices of 49 and 57, respectively. Ammonium nitrate produced higher yields than equivalent rates of nitrogen from fertilizer containing urea-formal-dehyde. Nitrogen contents of corn leaf samples and of grain were higher where ammonium nitrate was the source of nitrogen. The residual value of nitrogen on oat forage following cotton was determined. Urea-formaldehyde with an availability index of 49 had the greatest residual effect. However, the residual effect from ammonium nitrate was greater than from the index-20 material.

Contribution from the Agr. Exp. Sta. of the Alabama Polytechnic Institute, Auburn. This work was supported in part by a grant from Swift and Co. Presented before Div. IV, Soil Science Society of America, Atlanta, Ga., Nov. 19, 1957.

² Associate Soil Chemist.

Received for publication January 15, 1958. Accepted for publication March 17, 1958.