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1980年从采自许昌的91株大豆样中,用常规方法选出58个菌株。利用生理生化鉴定、水培和砂培接种试验以及测定固氮酶活性选出许2—4号菌株。经过小区和大田对比试验,接种许2—4的大豆可比对照增产11%,与优良菌株61A76相似。若与钼酸铵一起拌种,效果更佳,比对照可增产14.4%——21.0%。
In 1980, from 91 soybean samples collected from Xuchang, 58 strains were selected by conventional methods. The use of physiological and biochemical identification, hydroponic and sand culture inoculation test and determination of nitrogenase activity selected Xu 2-4 strains. After comparing plot and field experiments, the soybean yield of Xu 2-4 was 11% higher than that of the control, which was similar to that of the excellent strain 61A76. If mixed with ammonium molybdate, the effect is better than the control yield 14.4% - 21.0%.