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.
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 content of mineral-fixed ammonium in soil was related not only to soil clay minerals but also to fertilization.
固定态铵的含量不仅与土壤中的粘土矿物有关，施肥对其也有影响。
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