土壤粒度 meaning in Chinese

soil grades

Standard test method for particle - size analysis of soils
土壤粒度分析的标准试验方法
Test method for particle size distribution of soils
土壤粒度分布的试验方法
Particle - size features of chuodun paleosol and identification of its parent material
昆山绰墩古土壤粒度特征及母质判别
Mechanical analysis of soil
土壤粒度分析
Standard practice for wet preparation of soil samples for particle - size analysis and determination of soil constants
土壤粒度分析和常数测定用样品的湿法制备的标准操作规程