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试验在液体和固体培养下观测了稀土对苜蓿根瘤菌、红三叶根瘤菌、自三叶根瘤菌和沙打旺根瘤菌生殖的影响和田间应用效果。结果表明,稀土浓度在100～300ppm时,4种根瘤菌菌数增多,植株鲜重,植株根瘤鲜重和根瘤的固氮活性等均明显增高,表明有促进效应。液体培养下,当稀土浓度为500ppm时,4种根瘤菌菌数的增殖受到抑制;稀土浓度达1,000ppm时,四种根瘤菌均不生长。但是在固体培养下稀土对它们的生长仍具有促进效应。稀土与牧草根瘤菌配合施用,对豆科牧草植株鲜重和根瘤鲜重均显著增高,且根瘤的固氮活性比对照增加0.22～3.27倍。田间试验下四种豆科牧草株高平均增高35.9±3.5％,干草产量平均较对照增产34.9±3.4％。
The effects of rare earth on the reproduction of Rhizobium meliloti, Rhizobium trifoliata, Rhizobium trifoliata and Rhizobium sommi were observed under liquid and solid culture conditions and field application effects. The results showed that when the concentration of rare earth was in the range of 100 ~ 300ppm, the number of four Rhizobia bacteria increased, the fresh weight of plant, the fresh weight of root nodule and the nitrogen fixation activity of nodule increased obviously, which indicated that there was a promotion effect. Under the liquid culture, when the concentration of rare earth was 500ppm, the proliferation of four kinds of rhizobial bacteria was inhibited. When the concentration of rare earth was up to 1,000ppm, the four rhizobia did not grow. However, rare earths have a promoting effect on their growth under solid culture. Rare earths and grass rhizobia with the application of legume grass fresh weight and nodule weight were significantly increased, and nodulation activity of nitrogen than the control increased 0.22 to 3.27 times. The plant height of four leguminous herds increased by 35.9 ± 3.5% on average in field trials and that of hay increased by 34.9 ± 3.4% on average.