EUBCE 2024 - Yota KANNO - Effect of Thermal Treatment on Clopyralid Decomposition

Effect of Thermal Treatment on Clopyralid Decomposition

Short Introductive summary

Plant damage caused by clopyralid, an herbicide not registered as a pesticide in Japan, has become a serious problem. Clopyralid is brought into Japan via imported feed, and is believed to be insufficiently decomposed in composting process due to its resistant nature to microbial degradation. As a result, application of clopyralid residual compost to tomatoes and soybeans that are sensitive to clopyralid has caused growth defects. To solve these problems, there is a need to develop a management technique to decompose residual clopyralid in livestock manure. In this study, we consider the degradation of clopyralid by thermal treatment. Thermogravimetric analysis was performed to characterize the thermal degradation of clopyralid. The effectiveness of thermal treatment was then investigated by using a mixture of clopyralid and cattle manure, which was thermally treated at a specified temperature, in a pea growth test.

Y. Kanno, Graduate School of Agriculture, Hokkaido University, Sapporo, JAPAN
K. Iwabuchi, Research Faculty of Agriculture, Hokkaido University, Sapporo, JAPAN
T. Itoh, Research Faculty of Agriculture, Hokkaido University, Sapporo, JAPAN
H. Matsuura, Research Faculty of Agriculture, Hokkaido University, Sapporo, JAPAN