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Effect of Cacodylic Acid and MSMA on Nitrogen Transformations in Forest Floor and Soil¹

ABSTRACT

Cacodylic acid (hydroxydimethylarsine oxide) had no statistically significant effect on ammonification in three forest floors or three forest soils treated with 500 mg/kg peptone-nitrogen, and up to 1,000 mg/kg arsenic as cacodylic acid. MSMA (monosodium methanearsonate) caused an increase in ammonification which was linear with the logarithm of the arsenic concentration. Decreased nitrification appeared to be related to the logarithm of increased arsenic concentration. The nitrification potential was low in test substrates; however, and the magnitude of the chemically induced depression of nitrification was small. The concentrations of arsenic which occur in forest floor and soil after precommercial thinning with MSMA and cacodylic acid should not have a significant adverse effect on nitrogen metabolism of forest floor and soil microorganisms.

Key Words: Hydroxymethylarsinoex oxide • monosodium methanearsona • nitrification • ammonification • forest thinning

¹ Contribution from Forest. Sci. Lab., Pacific Northwest Forest and Range Exp. Stn., Corvallis, OR 97331.

² Principal Microbiologist, Supervisory Research Chemist, and Technician.

Received for publication April 5, 1976.