论文部分内容阅读
土壤中含有许多大小不同的土粒子,这些土粒中有的我们肉眼能够看到,像沙土粒;有的看不到单个土粒,它们在水中时只能看到水是混浊的,像粘土粒。土壤中的土粒,在水泡着的状况下,成为泥浆状态,乾时结成土塊的,我们管这样的土壤叫无结构的土壤。另一类土壤的土粒,能够胶结成小团,每个小团的直径是自1—10公厘,在水中不成为泥浆,乾时不变成土塊。我们管这样的土壤叫有结构的土壤。有结构的土壤和无结构的土壤,各方面的性状是相差很远的。
The soil contains many different sizes of soil particles. Some of these particles can be seen by the naked eye like sand particles. Some can not see individual particles. When they are in water, they can only see that the water is turbid, like clay. grain. The soil particles in the soil, in the condition of blisters, become a mud state, and when they dry, they form a mass of soil. The soil we control is called unstructured soil. The soil particles of another type of soil can be cemented into small groups. The diameter of each small group is from 1 to 10 mm. It does not become mud in water and does not become a clod when dry. We control such soils as structured soils. Structured soils and unstructured soils have very different traits in all aspects.