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新的研究说明了种植玉米的农民如何对付杂草带来的问题，播种时使用更多的种子会有益处。美国农业部的科学家进行了为期３年的研究，发现种子用量增加５０％能使杂草生长量减少９５％。科学家认为，在农作物更加稠密的农田里既然杂草会减少，那么农民需要使用的化学除草剂...
New research shows how farmers planting corn can deal with the problems posed by weeds, and it can be beneficial to use more seeds when sowing them. USDA scientists conducted a three-year study and found that a 50% increase in seed use reduced weed growth by 95%. Scientists believe farmers need chemical herbicides as weeds diminish in the more densely populated fields ...