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氮以游离状态存在于空气中,占空气总体积的4/5,一般植物不能直接利用,但根瘤菌等微生物和藻类却能加以固定,即生物固氮。一年中在地球上由这类生物固定的氮约1亿吨,其中由根瘤菌固定的达3500—5500万吨。在自然情况下,根瘤菌与豆科植物共生,可提高土壤肥力,为作物提供了大量优质氮肥,使作物的产量提高。豆科作物接种根瘤菌,可达增产目的。人工培养繁殖根瘤菌,制成菌剂接种于丸衣种子,为种子丸衣化解决氮肥问题,以利于牧草飞播,大面积改良草场,增加牧草产量,是国
Nitrogen is present in the air in a free state, which accounts for 4/5 of the total volume of air. Generally, plants cannot be used directly, but microorganisms such as rhizobia and algae can be fixed, that is, biological nitrogen fixation. In the year, about 100 million tons of nitrogen is fixed by such organisms on the earth, among which 35-55 million tons are fixed by Rhizobium. Under natural conditions, symbiosis with rhizobia and leguminous plants can increase soil fertility, provide a lot of high-quality nitrogen fertilizers for crops, and increase the yield of crops. Legumes are inoculated with Rhizobium, which can increase production. Cultivation of rhizobia by artificial cultivation, inoculation of bacteria inoculants in the seedlings of the seedlings, application of pelleting to solve the problem of nitrogen fertilizer, to facilitate the forage aerial broadcasting, large-scale improvement of the grassland, increase the yield of pasture, is the country