本法具有成本低、施药期长、无水稻共生、不易伤害作物、操作方法简便等优点，除草效果90％以上，每亩可增产稻谷100公斤。一、防除对象。以案板草、四叶草为主的多年生稻田恶性杂草。二、施药前相田准备。在稻谷收割后，拔掉沿田边2米内的稻桩，及时犁田，顺耙做边，蓄水9一12 The method has the advantages of low cost, long application period, symbiotic rice-free rice, less damage to crops and simple operation method. The herbicidal effect is more than 90%, and 100 kg of rice can be increased per acre. First, control objects. In order to board grass, clover-based perennial rice fields of malignant weeds. Second, before applying field preparation. After the harvest in the paddy, unplug the rice piles within 2 meters along the edge of the field, plow fields in time,