铵的矿物固定和吸附是土壤氮素循环中的重要环节。
The fixation and adsorption of ammonium are important parts of nitrogen recycle in soils.
豌豆是人类和动物的营养物，作为覆盖作物有效控制病虫害，固定氮素。
Pigeon pea: cover crop suited to human and animal nutrition, pest and disease control, N fixation and P disponibility.
高于湖南省以北地区土壤和本地区地带性土壤—红壤的固定态铵含量，是该地区的一项重要的土壤氮素资源。
The contents of fixed ammonium were higher than those in soil of North Hunan region and in soil of red earth region , and were a main N resource in the province.
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