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A Comparison of Injected Anhydrous Ammonia into Bermudagrass Sod Compared to Topdressed Applications of Urea and Ammonium Nitrate¹

ABSTRACT

Soil fertility experiments, primarily concerned with the evaluation of anhydrous NH₃ as a source of N for bermudagrass, Cynodon dactylon (L.), when applied with the rolling coulter-type applicator, were conducted on Parsons silt loam and Port sandy loam soils. Two factorial treatment combinations were used. The first consisted of four rates of N applied as (NH₂)₂CO, NH₄NO₃ and anhydrous NH₃. The second consisted of complete factorial combinations of four rates of N as anhydrous NH₃ and three spacings of the NH₃ applicator knife.

In general, yields were equal for all sources and all clippings at lower rates of N application. At the higher rates of N application, anhydrous NH₃ produced lower yields in the first clipping and higher yields in succeeding clippings. This lag in response from anhydrous NH₃ was attributed to sod burn from escaping ammonia. Reducing the applicator knife spacing tended to increase NH₃ retention, decrease the sod burn, and increase the NH₃ efficiency at the high rates of N application.

¹ Part of a thesis submitted by the senior author in partial fulfillment of the requirement for the M.S. degree. This investigation was supported in part by a grant-in-aid from the Phillips Petroleum Company, Bartlesville, Oklahoma.

² Instructor and Professor of Agronomy, respectively. Oklahoma State University, Stillwater.

Received for publication July 20, 1967. Accepted for publication November 3, 1967.