1.  Efficient Nitrogen Supply for Soybeans

Rhizobium japonicum can fix 50–150 kg of nitrogen per hectare for soybeans in a growing season, which can meet 60%–80% of the nitrogen demand during soybean growth. This reduces the need for chemical nitrogen fertilizers and avoids the problem of nitrogen fertilizer waste caused by volatilization or leaching.

2.  Promoting Soybean Growth and Yield Increase

In addition to providing nitrogen, the symbiosis of Rhizobium japonicum can stimulate soybean roots to secrete growth-promoting substances (auxins, cytokinins, etc.), which promote the development of the root system and above-ground vegetative organs (stems, leaves). Field practice shows that inoculating soybeans with high-efficiency Rhizobium japonicum strains can increase soybean yield by 10%–20%.

3.  Improving Soil Fertility and Subsequent Crop Benefits

    After soybean harvesting, residual roots and root nodules decay in the soil, releasing the fixed nitrogen into the soil. This increases the soil’s organic nitrogen content and improves soil fertility, creating a favorable nutrient environment for subsequent crops (such as corn, wheat) in the rotation system.

4.  Reducing Environmental Pollution

    Reducing the application of chemical nitrogen fertilizers can decrease the risk of soil compaction and water eutrophication caused by excessive nitrogen. Meanwhile, the production of chemical nitrogen fertilizers consumes a large amount of fossil energy; using Rhizobium japonicum for biological nitrogen fixation helps reduce carbon emissions in agricultural production.