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Persistence and Effect of TMTD on Soil Respiration and Nitrification in Two Nursery Soils

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Persistence of tetramethylthiuram disulfide (TMTD) and its effect on activity of soil microflora in general and on nitrifying micro-organisms in particular were investigated in soils from two tree nurseries in western Washington. TMTD was depleted in both soils; rate of depletion depended on initial concentration of the chemical and action of soil micro-organisms. Addition of some commercial fertilizers enhanced depletion. Use of these fertilizers or addition of well-decomposed organic matter in the nursery would probably increase degradation of TMTD in soil. TMTD decreased soil respiration. Soils responded differently to treatment, but initial depressions of CO2; production in both soils were proportional to concentration of TMTD in soil. Following initial inhibition in two treatments, respiration was stimulated, probably due to utilization of decomposition products of TMTD by micro-organisms. Nitrification was impaired by TMTD for 20 days but by 60 days had recovered completely in almost all cases. Effects of TMTD reaching the soil during spray operations with a repellent formulation containing the chemical do not seem serious, and even beneficial effects seem possible under some conditions.

Document Type: Journal Article

Affiliations: Plant Physiologist, Division of Timber Management Research, Pacific Northwest Forest and Range Expt. Sta., Forest Service, U. S. Dept. Agric., Portland, Oreg.

Publication date: 1965-06-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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