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第二次世界大战后,稻田化学除草技术在日本因其具有显著的省力效果而备受重视。战前,虽有开发改良中耕除草机进行杂草防除,但仍以人工除草为主体,平均每亩耗时24～34小时,是极其繁重的作业。战后使用2,4—D丁酯以来,开始了稻田化学除草。现在稻田杂草防除是以化学除草为主体。从日本全国来看,水稻一季约施2次除草剂就能控制住杂草的危害,除草用劳力大大降低,每亩只需几小时。稻田化学除草技术的进步,取得了巨大的经济效益,但也是杂草群落变化的主要原因。
After World War II, paddy field chemical weeding technology in Japan because of its significant labor-saving effect and much attention. Before the war, despite the development and improvement of weed control weed cultivation, but still the main artificial weeding, the average time consuming 24 to 34 hours per mu, is extremely heavy work. Since the post-war use of 2,4-D butylate, chemical weed-rushes began in paddy fields. Weed control in paddy fields is now dominated by chemical weeding. From the point of view of Japan, the damage to weeds can be controlled by the application of twice-a-year herbicides in paddy fields in the first quarter of the year. Weeding labor is greatly reduced with only a few hours per mu. Advances in chemical weed control technology in paddy fields have achieved great economic benefits, but they are also the main reasons for the changes in weed communities.