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 > or = 1 g m(-2). Incorporation of the fungicide significantly increased NH4+ 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 beta-glucosidase activities were the most sensitive to ridomil gold plus. This sensitivity was more pronounced with the dehydrogenase activity.
Highlights
Ridomil gold copper plus is a new fungicide, which was recently put on the market by Syngenta Co, to replace the former ridomil plus 72 used to fight Phytophtora fungus in cocoa farms
It is a mixture of active ingredients copper oxide (60%) and metalaxyl-M (6%)
The specific objective of this study was the determination of the effects of ridomil gold plus amendments on selected soil quality parameters including N and P transformation processes, and soil enzyme activities
Summary
Ridomil gold copper plus (ridomil gold plus) is a new fungicide, which was recently put on the market by Syngenta Co, to replace the former ridomil plus 72 (copper oxide, 60% + metalaxyl, 12%) used to fight Phytophtora fungus in cocoa farms. Metalaxyl-M [methyl N(2,6-dimethylphenyl)-N-(methoxyacethyl)-D-alaninate] is the R-enantiomer of metalaxyl and has been on the market since 1996 under various formulations and trade names including Ridomil gold, Fonganil gold, Apron XL, Subdue, and MAXX. It provides the same level of efficacy as metalaxyl but at half of the application rate. Metalaxyl-M is designed to replace technical metalaxyl in parts of the world where the registration of metalaxyl has not been renewed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
