水稻田的生产力通常以氮化物的数量和性质为转移,也是土壤肥力的重要指标,研究水稻田中氮素循环的各个环节,如氨化作用、硝化作用、反硝化作用和固氮作用等,是生产上急迫需要解决的问题。而水稻田的氮素循环主要是生物学循环,其中微生物在这过程中起着十分重要的作用,我们的任务是要了解其规律,控制不利的方面,发展有益的方面,为丰产服务。 土壤在淹水种植水稻后,发生一些特定的物理、化学和生物学性质的变化,其中如氧化还原电位的下降,pH值的升高,某些可溶性物质的增多,以及磷酸盐、硅盐等的溶解度的增加,铁、锰、硫酸盐的还原,有机物质的嫌气分解及其产物的性质等,都影响着氮素转化的微生物学过程。值得提出注意的是:水稻田包括水 The productivity of paddy fields is usually shifted by the amount and nature of nitrides. It is also an important indicator of soil fertility. Studying all aspects of nitrogen cycling in paddy fields, such as ammonification, nitrification, denitrification and nitrogen fixation, On the urgent need to solve the problem. The nitrogen cycle in paddy fields is mainly a biological cycle, in which microorganisms play a very important role in this process. Our task is to understand its laws, control unfavorable aspects, develop beneficial aspects and serve high yields. Some changes occur in the physical, chemical and biological properties of soils after they are flooded and planted in paddy soils, such as the reduction of redox potential, the increase of pH value, the increase of some soluble substances, and the increase of phosphates, silicon salts, etc. The increase of solubility, the reduction of iron, manganese and sulfate, the decomposition of organic matter and the nature of their products all affect the microbiological process of nitrogen transformation. Worth noting is that paddy fields include water