Changes in Soil Chemical Properties and Microbial Activities in Response to the Fungicide Ridomil Gold Plus Copper

Joseph Demanou, Adolphe Monkiédjé, Thomas Njiné, Samuel M. Foto, Moise Nola, Serges H. Zebaze Togouet and Norbert Kemka
Additional contact information
Joseph Demanou: Laboratory of General Biology. Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I., P.O. Box 812 Yaounde, Republic of Cameroon
Adolphe Monkiédjé: Laboratory of General Biology. Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I., P.O. Box 812 Yaounde, Republic of Cameroon
Thomas Njiné: Laboratory of General Biology. Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I., P.O. Box 812 Yaounde, Republic of Cameroon
Samuel M. Foto: Laboratory of General Biology. Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I., P.O. Box 812 Yaounde, Republic of Cameroon
Moise Nola: Laboratory of General Biology. Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I., P.O. Box 812 Yaounde, Republic of Cameroon
Serges H. Zebaze Togouet: Laboratory of General Biology. Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I., P.O. Box 812 Yaounde, Republic of Cameroon
Norbert Kemka: Laboratory of General Biology. Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I., P.O. Box 812 Yaounde, Republic of Cameroon

IJERPH, 2004, vol. 1, issue 1, 1-9

Abstract: The purpose of the study was to investigate changes of soil chemical and biological properties changes resulting from a single application of the fungicide Ridomil Gold plus copper (Ridomil Gold plus)(mefenoxam 6% + copper oxide 60%) at the following rates 0.25, 0.5, 1, 2, and 10 g m -2 . Selected chemical properties generally differed between fungicide rates over longer incubation periods. Microbial activity indices (available N, ammonification rates and specific enzymatic systems) were more sensitive indicators of change. Values of these indicators generally increased with incubation period and decreased or increased at high rates. Significant changes in P availability occurred after 90 days of incubation at rates ? 1 g m -2 . Incorporation of the fungicide significantly increased NH 4 + levels in soil after 75 days of incubation. These changes stimulated soil microbial activity as evidenced by increased ammonification rates especially at long-term exposure. Of the enzyme activities studied, dehydrogenase and ß-glucosidase activities were the most sensitive to ridomil gold plus. This sensitivity was more pronounced with the dehydrogenase activity.

Keywords: Ridomil gold plus; enzyme activities; soil chemical properties; field conditions; nitrogen transformation (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2004
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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