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豆科植物及生物固氮在人类生产和生活上的重要意义已为越来越多的人所认识。许多国家不断扩大豆科作物的种植面积,以向人类和家畜提供所需要的优质蛋白质。据统计,大豆在世界豆科粮食作物总产中约占47％。美国的大豆产量占本国豆科粮食作物产量的67％左右,其次种植面积较大的是苜蓿。尽管这些作物在农业上十分重要,但其产量的提高不如谷类作物快。美国哈迪(Hardy)在不同大田条件下测定豆科植物固氮率的试验指出,要提高豆
The importance of legumes and biological nitrogen fixation in human production and life has been recognized by more and more people. Many countries continue to expand the area planted with leguminous crops to provide the human and livestock with the high quality protein they need. According to statistics, soybean accounts for about 47% of the total leguminous crops in the world. The U.S. soybean production accounts for about 67% of its leguminous grain crop production, followed by that of alfalfa. Although these crops are very agriculturally important, their yields are not improving faster than cereals. Hardy in the United States under different field conditions test nitrogen fixation rate of legumes pointed out that the need to raise beans