玉米地的杂草控制杂草和大多数植物一样喜光，一有机会就会徒长，遮光争肥，影响农作物生长。为了解决这一问题，美国农民每年要使用近２．３亿公斤化学除草剂。仅防止玉米地杂草，每年就使用大约９１００万公斤除草剂。美国农业部的研究人员研究出一种玉米种植的新方法，... Weed Control in Cornfield Weeds, like most plants, enjoy the same benefits as long-term opportunities, obstruct light obesity, and affect the growth of crops. To solve this problem, American farmers use nearly 230 million kilograms of chemical herbicides each year. About 95 million kilograms of herbicide are used annually only to prevent weeds in corn fields. US Department of Agriculture researchers have developed a new method of corn cultivation, ...