The influence of metam sodium on soil respiration |
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| Authors: | R Riffaldi M Filippelli R Levi‐Minzi A Saviozzi |
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| Institution: | 1. Department of Agricultural Chemistry and Biotechnologies , University of Pisa , via del Borghetto, 80;2. ARPAL Chemical Laboratory , La Spezia;3. Department of Agricultural Chemistry and Biotechnologies , University of Pisa , via del Borghetto, 80 E-mail: alesavio@agr.unipi.it |
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| Abstract: | Abstract A laboratory experiment was performed in order to evaluate the extent to which metam sodium (MS) applied at two different recommended rates and its degradation product, methyl isothiocyanate ( MITC ), affect soil respiration. Results suggest that MS degradation to MITC was complete within 4 hours and that MITC decomposed quickly in a few days, except in the soil containing high organic matter where it was still present after 15 days. Following the addition of MS, a lag phase appeared in CO2‐C evolution in the soil. It was longer for the higher dose of MS added and for the two soils with low organic C content. The dynamics of the process was described by the Bonde and Rosswall model and by the Gompertz RS E model for the untreated and the MS‐treated soils, respectively. |
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| Keywords: | Sodium N‐methyldithiocarbamate methyl isothiocyanate kinetic models carbon dioxide evolution |
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