美国农业研究部门认为,在水肥条件好的土地上,一般种大豆的人都可达到平均每英亩70蒲式耳的产量(每蒲式耳大豆等于54.43斤;1英亩等于6.07市亩,下同);但用现有的生产措施使平均产量超过70蒲式耳则是困难的。美国大豆生产研究人员的目标,是每英亩大豆的产量达到90蒲式耳以上。使人感到鼓舞的是,有两次每英亩的产量接近90蒲式耳,但还不能连续保持这个结果。他们认为,要想突破每英亩90蒲式耳产量的每一个尝试,都必须 The U.S. Department of Agricultural Research believes that average soybean yields average 70 bushels per acre (54.43 pounds per bushel of soybeans; 6.07 acres per acre) in land with good water and fertilizer conditions; however, Existing production measures make it difficult to produce on average more than 70 bushels. The goal of US soybean production researchers is to produce more than 90 bushels per acre of soybeans. It is encouraging to see that twice the yield per acre is close to 90 bushels, but this result can not be maintained continuously. They think every attempt to break through 90 bushels per acre must be done