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由于前些年我市大面积连续使用除草醚进行稻田除草,使得主要草相发生很大变化,在生长中后期,阔叶杂草如矮慈菇(Sagittaria pygmaea)、节节草(Rotala indica)等已成为优势种。为防除这类阔叶杂草多用20%二甲四氯水剂喷雾防治。但是采用这种方法比较费工,且易产生药害,特别是在高温天气或在孕穗后期施药更易产生药害。针对上述情况,我站在近几年的探索和实践中改用草木灰拌二甲四氯撒施,效果很好,防除杂草的效果在80%以上。其具体做法是将20%二甲四氯水剂,每亩用量250ml,先将这250ml 药液加750克草木灰(稻草灰、麦草灰)拌匀,然后再加7.5千克草木灰混匀或者将药
Because weeding herbicides in large area in a few years in a few years in our city greatly changed the main grass facies, the broad-leaved weeds such as Sagittaria pygmaea, Rotala indica, Has become the dominant species. In order to control such broad-leaved weeds more than 20% dimethyl tetrachloride spray prevention and treatment. However, this method is more labor-intensive, and easy to produce phytotoxicity, especially in hot weather or late booting application is more likely to produce phytotoxicity. In response to the above situation, I stood in the exploration and practice in recent years to switch to the use of straw mixed with tetrachloro-chlorine, the effect is very good, weed control effect of more than 80%. The specific approach is to 20% dimethyl tetrachloride agent, the amount of 250ml per acre, the first 250ml of liquid and 750 grams of ash (straw ash, wheat straw ash) mix, and then add 7.5 kg of ash or mix the medicine