农田杂草是指生长于农田,妨碍农作物正常生长发育的非栽培植物。据调查我国主要农田杂草有500余种,它们或与作物争夺肥水、争夺阳光,或滋生病虫,或直接寄生于作物上,或分泌毒素抑制作物生长,甚至有些杂草还带毒直接影响人畜健康和安全。由于杂草比作物对环境的适应性强、繁殖快,因而成为农业生产的大敌。世界范围内农业生产每年受杂草危害损失达10％左右,仅美国每年由于杂草造成的谷物损失就达90—100亿美元。因此,农田杂草防除日益受到各国重视。 传统的防除杂草的方法是耕作防除,即依靠人力、畜力或机械动力牵引各种农具进行中 Farmland weeds refer to non-cultivated plants that grow on farmland and prevent the normal growth and development of crops. According to the survey, there are over 500 species of weeds in major agricultural fields in China. They compete with crops for fertilizer and water, compete for sunshine, or generate pests and diseases, or directly parasitize crops or secrete toxins to inhibit crop growth. Some weeds even have a direct impact on them Human and animal health and safety. Because weeds are more adaptable to the environment and reproduce faster than crops, weeds become the enemy of agricultural production. Every year, the damage to weeds produced by agricultural production in the world is about 10%. Only the cereal loss caused by weeds in the United States reaches 90-100 billion U.S. dollars each year. Therefore, the control of farmland weeds is increasingly valued by all countries. The traditional method of weeding control is farming control, that is, rely on human, animal or mechanical power to pull a variety of tools in progress