根据植物体自然生态系的原理,北京农业大学植病生防研究室自1977年开始从植物根表分离筛选对作物生长有利的细菌,研制出多种农作物的增产菌。到1987年底,已在我国26个省(区、市)、5000多万亩土地、48种作物上进行了试验、示范及大面积推广,增产幅度一般可达10％以上。其中,水稻增产率为7.1—31.8％,小麦为。 According to the principle of plant natural ecosystem, plant disease prevention and control laboratory of Beijing Agricultural University since 1977, from the plant root surface separation and screening of crops conducive to the growth of bacteria, developed a variety of crops increased bacteria. By the end of 1987, tests, demonstrations and large-scale popularizations have been carried out in 26 provinces (autonomous regions and municipalities), more than 50 million mu of land and 48 crops in our country, with the rate of increase being generally above 10%. Among them, the yield of rice is 7.1-31.8%, wheat is.