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Distribution and Retention of Anhydrous Ammonia in Sandy Soils¹

ABSTRACT

Anhydrous ammonia was applied to several sandy soils which are typical of many soils in Coastal Plain areas. Applications of 58, 115 and 258 pounds per acre of ammonia nitrogen were made at a depth of approximately 5 inches with the injector feet set 13.5 inches apart. Studies were made of the distribution of ammonia around the injection line and of its retention by these soils.

The ammonia was found to be concentrated in zones from 2 to 8 inches wide, depending on the soil moisture content. Most of the ammonia was usually concentrated in a zone 3 inches wide at rates of application as high as 258 pounds per acre of nitrogen. This resulted in a very high concentration of ammonia at the injection line. The retention was somewhat variable, but in only one instance, at the 58 pound per acre rate of application, was nitrogen found which equaled that applied. On several soils, losses were shown even at the 58 pound per acre application of nitrogen.

¹ Florida Agr. Exp. Sta. Journal Series, No. 234. Presented before Div. IV, Soil Science Society of America, Dallas, Tex. Nov. 20, 1953.

² Assistant Biochemist and Assistant Soil Microbiologist, respectively, Soils Department, Agr. Exp. Sta., University of Florida, Gainesville Fla.

Received for publication December 10, 1953.