在美国东南部紧实土壤上。采用一种新的种植技术——缝植。即向下直切15时深和1/16时宽的窄缝,为促进大豆根深扎提供一个通道,使根能吸收土壤深层的养分和水分。据试验,大豆主根在一周内即达到缝底,不受紧密土层的严重限制,产量也超过不切缝种植的大豆,每英亩产27蒲式耳(每蒲式耳大豆约重54斤,每英亩合6.07亩——译者注),而不切缝的仅15蒲式耳。用此法 Tight soil in the southeastern United States. Using a new planting technique - sewing. That is, straight down at 15 o’clock deep and 1/16 wide when the slit, to promote the deep roots of soybean root to provide a channel so that the roots can absorb nutrients and water deep soil. According to the test, the main roots of soybean reached the seams within a week without being severely restricted by tight soils and also yielding more than unsewn soya beans, yielding 27 bushels per acre (about 54 pounds per bushel of soybeans and 6.07 acres per acre) Mu - translator note), but not only 15 bushels of seams. Use this method