杂草同农作物竞争养分和空间,抑制作物生长,使用除莠剂会污染环境,增加投入,对农业生产不利。现在,美国科学家发现旧报纸等是一种良好安全可靠的田间杂草的覆盖物,除草的效果相当好。据马里兰州农业试验站的生态专家切伊利博士的研究证明,黑白版面的报纸,包括含有彩印照片的报 Weeds compete with crops for nutrients and space, inhibit the growth of crops, the use of herbicides can pollute the environment and increase inputs, which is detrimental to agricultural production. Now, American scientists found that old newspapers and the like are a kind of good and safe cover of field weeds, and the effect of weeding is quite good. According to a study by Dr. Cecilie, an ecologist at the Maryland Agricultural Experiment Station, black-and-white pages of newspapers, including newspapers containing color photographs