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Soil Tillage Effects on Ammonia Volatilization from Surface-Applied or Injected Animal Slurry

Dep. of Plant Nutrition and Physiology, P.O. Box 23, 8830 Tjele, Denmark,

A. K. Ersbøll

Dep. of Biometry and Informatics, Res. Centre Foulum, P.O. Box 23, 8830 Tjele, Denmark.

^* Corresponding author.

ABSTRACT

Ammonia (NH₃) losses from cattle (Bos sp.) and pig (Sus scrofa) slurry applied to a harrowed and unworked soil were studied in seven field experiments from October 1990 to December 1991. In one experiment slurry was directly injected into the soil and hi six experiments slurry was surface-applied. Ammonia losses were measured with a wind tunnel system. From directly injected slurry applied to a recently harrowed soil, NH₃ losses were 30% of the losses from an unworked soil. Harrowing the soil immediately before surface application of the slurry reduced losses to less than 50% of the losses from an unworked soil. The accumulated NH₃ loss from slurry applied in the field was described with a Michaelis-Menten-like equation, showing the NH₃ loss reaction modeled adequately as a first-order reaction. The effect of treatment, soil conditions, or environmental conditions on NH₃ loss pattern from slurry applied in the field may therefore be treated statistically by comparing the parameters in the Michaelis-Menten equation.

(A.K. Ersbøll, present address: Dep. of Mathematics and Physics, The Royal Veterinary and Agric. Univ., Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark)

Received for publication October 7, 1992.

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