邻五氯二甲苯——简称“0·5·6”,原是制药工业的副产品。我场自一九六七年以来用它处理棉花、三麦的种子,证明有较好的杀菌防病效果。(一)棉种处理:使用浓度1∶500倍液浸棉种12小时,浸后取出稍晾干即可播种。经试验,“0·5·6”的防 Pentachlorobenzene, or “0.5.6” for short, was originally a by-product of the pharmaceutical industry. My field has used it to treat the seeds of cotton and three grains since 1967, proving that it has a good bactericidal and disease-controlling effect. (A) cotton seed treatment: the concentration of 1: 500 times soaking cotton seed 12 hours, after dipping a little dry to sow. After testing, “0.5 · 6” defense