Effectiveness of low-temperature biochar in controlling the release and leaching of herbicides in soil

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124

作者：

J Li，Y Li，M Wu，Z Zhang，J Lü

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摘要：

Biochars, being good sorbents of organic compounds, can reduce the mobility of pesticides in soil and subsequent pollution to groundwater, but may also impact on the efficacy of soil-applied herbicides. The aim of this study is to seek a potential solution to this problem.We prepared a wood biochar at a relatively low heat treatment temperature (350 A degrees C), and used it as an adsorptive carrier for incorporating the herbicides 2,4-D and acetochlor, and also as a soil amendment. Release experiment through a thin soil layer and leaching experiment through a soil column were used to evaluate the effectiveness of the biochar for controlling the release and leaching of herbicides in soil.The release experiments demonstrated that the low-temperature biochar could control the release of herbicides in soil, and the leaching experiments showed that this biochar significantly reduced the leached amount of herbicides by 1/2 similar to 3/4, depending on the depth (5 similar to 15 cm) of biochar-amended topsoil. High retention of herbicides in the biochar-amended topsoil was observed.The results suggest that the low temperature biochar, if applied properly in soil, may be useful for extending the efficacy of herbicides while controlling their potential pollution.

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关键词：

ACTIVATED CARBON ORGANIC-MATTER SORPTION FORMULATIONS CROP PESTICIDES PYROLYSIS EFFICACY ATRAZINE CHARCOAL