水稻是我国第一大农作物,种植面积约5亿多亩。我国常见稻田杂草类型中,禾本科有15种,莎草科有28种,阔叶杂草有81种,藻类杂草有3种。稗草是水稻田第一大恶性杂草,受稗草危害的有1亿多亩。全国稻田杂草发生面积约1500万公顷,占水稻种植面积的45%左右,每年损失稻谷约1000万吨,损失率15%左右。未防除杂草的稻田一般减产5%~15%,严重的减产15%~30%,甚至失收。 Rice is the largest crop in China with an acreage of about 500 million mu. Among the common paddy weed types in our country, there are 15 species of Gramineae, 28 species of Cyperaceae, 81 species of broadleaf weeds and 3 species of algae and weeds. Barnyardgrass is the largest malignant weed in paddy fields, with over 100 million mu harmed by barnyardgrass. The area of ​​paddy weeds in the country is about 15 million hectares, accounting for about 45% of the rice planted area. The annual loss of rice is about 10 million tons and the loss rate is about 15%. Uncontrolled weedy rice fields generally cut 5% to 15%, a serious cut 15% to 30%, or even lost.