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Ammonia Volatilization from Liquid Digested Sewage Sludge as Affected by Placement in Soil¹

ABSTRACT

In a laboratory study, liquid sewage sludge was added to an Olney sandy loam (fine-loamy, mixed, mesic, Ustollic Haplargids) at a rate equivalent to 7.6 Mg ha^–1 either on the surface or 25 mm below the surface. The sludge contained 11.2 g kg^–1 NH₄-N and 21.6 g kg^–1 organic-N on a dry weight basis and 27 g L^–1 solids. Surface applied sludge lost 40.3% of its NH₄-N as NH₃ in the first 2 weeks (95% of the total loss) while subsurface applied sludge lost 0.35% of added NH₄-N as NH₃ in the same period. Total NH₃-N loss from surface applied liquid sludge was 36.0 kg ha^–1, which was 42.4% of added NH₄-N. Soil analyses at the end of the study showed that 96% of the inorganic-N was in the form of NO₃ in sludge amended treatments. Fertilizer value of liquid sludge will be greater with subsurface injection than surface application. Where available N limits sludge loading rates surface application would reduce land requirements.

¹ Contribution from the Agron. Dep., Colorado State Univ., Fort Collins, CO 80523.

² Instructor and Professor of Soil Science, respectively. Senior author is currently a Soil Scientist, USDA, ARS, Suffolk, VA 23437.

Received for publication January 8, 1987.

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