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加拿大农业部的科学家们所做的一项长期研究表明:连续施用2,4—D对土壤微生物和土壤肥力没有副作用。试验开始于1947年,在 Saskatchwan省的一个试验农场上进行。通过测定生物
A long-term study by scientists at Canadian Department of Agriculture shows that continuous application of 2,4-D has no side effects on soil microbes and soil fertility. The experiment began in 1947 on a pilot farm in Saskatchewan. By measuring organisms