作者初步探索了硝酸稀土和氯化稀土对豆科牧草根瘤菌生长繁殖的刺激作用。通过四大类豆科牧草根瘤菌试验,确认两种稀土对银合欢、苜蓿、三叶草、沙打旺根瘤菌都有刺激作用,但有效浓度不同。氯化稀土其有效浓度从50—400ppm,相关系数基本呈线性关系。硝酸稀土50—200ppm,对根瘤菌有刺激作用。250ppm时,刺激作用减弱,到350ppm时,有抑制作用。 The authors initially explored the stimulating effects of rare earth nitrate and rare earth chloride on the growth and reproduction of leguminous rhizobia. Through four kinds of leguminous rhizobium tests, it was confirmed that two kinds of rare earths stimulated Rhizobia, alfalfa, alfalfa, clover and sand rhizobium, but the effective concentrations were different. The effective concentration of rare earth chloride from 50-400ppm, the correlation coefficient was basically linear. Rare earth nitrate 50-200ppm, a stimulating effect on the rhizobia. 250ppm, the stimulus weakened to 350ppm, there is inhibition.