Changes in Escherichia coli Efflux from Farmland by Surface Runoff and Percolation under Different Application Methods of Manure

抄録

The application of cattle manure in farmlands was considered as a proper treatment from a viewpoint of organic agriculture. However, pathogenic bacteria known as E. coli in immature fermented manure happen to spread out from farmlands. So, the objective of this study is to investigate E. coli efflux under different application methods of cattle manure. Slope modeling experiment was conducted under an artificial rainfall simulator. Slope plots were filled with soil then fresh cow dung and 2 weeks fermented manures were applied into the plots. Cow dung and manure were applied with 2 application methods: the broadcasting method and the incorporating method. Based on the experimental results, it was found that E. coli efflux increased with soil loss through surface runoff. Moreover, it showed that the amounts of E. coli efflux were higher than that of input in either plot broadcasted or incorporated with cow dung. In addition, there were tendencies that E. coli had been transported by percolation although it was smaller in number than that by surface runoff.