直接的方法就是测定砂粒、粉粒和粘粒中的固定态铵含量。
The direct method is to determine the contents of fixed ammonium in sand, silt and clay.
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。
The content of mineral-fixed ammonium in soil was related not only to soil clay minerals but also to fertilization.
土壤粘粒含量和粘土矿物组成是决定土壤固定态铵含量及最大固铵容量的两个主要因素。
The clay content and clay composition of the tested soils are the two important factors influencing their fixed ammonium content and maximum capacity of ammonium fixation.
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.
作物对“老固定态”铵的利用能力很弱。
作物对“老固定态”铵的利用能力很弱。
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