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在旱秧田、水秧田、旱直播田和水直播田的试验中,播前施用五氯酚钠,每公顷5—20公斤,除草效果不够良好。但在插秧本田的试验中,插前每公顷施用五氯酚钠15—30公厅对防除稗草(Echinochloa crusgalli (L.) Beauv.)和球穗莎草(Cyperus globosus All.)的效果极为良好。以在插秧前一天,每公顷施用30公斤效果最好,对稗草和球穗莎草的防除效果分别达到92.7%和79.6%。插后处理,每公顷施用五氯酚钠15公斤,效果也较好。另外的试验,观察了五氯酚钠不同剂型:颗粒剂、混土、溶液等的防除效果。防除稗草用颗粒剂和混土处理要优于溶液处理;防除球穗莎草则以溶液处理为最好。各处理对水稻均无药害,所有用五氧酚钠处理区的产量均高于不除草区,但较两次人工除草的为低。本文讨论了在秧田和直播田用五氯酚钠防除稗草效果较差的原因。
In trials of dry-seedling, water-seedling, dry-planting and water-seeded fields, sodium pentachlorophenate at a rate of 5-20 kg per hectare was not good enough for weed control. However, in the experiment of transplanting Honda, the application of sodium pentachlorophenate at 15-30 hectares before planting was extremely effective in controlling Echinochloa crusgalli (L.) Beauv. And Cyperus globosus All. good. The best effect of applying 30 kg / ha on the day before planting was 92.7% and 79.6% respectively. After interpolation, the application of sodium pentachlorophenate 15 kg per hectare, the effect is better. In addition, the effects of different formulations of sodium pentachlorophenol, such as granule, soil and solution, were observed. Control of barnyardgrass with granules and mixed soil treatment is better than solution treatment; All treatments had no phytotoxicity on rice, and the yield of all those treated with sodium pentoxyphosphate was higher than that of non-herbicidal zone, but lower than those of two artificial weeds. This paper discusses the reasons why sodium pentachlorophenate is less effective in controlling barnyard grass in seedling and field.