一、什么是土壤胶体在解释这个名词之前,社我们先做一个简单的实验:挖一小块土放入玻璃杯中,加一点儿浓盐水湿润以后,用手指研磨成泥浆状,然后加入开水冲稀,这时,整个玻璃杯部变浑浊了。当我们过一会儿再去看时,我们就会发现杯中的土已分成了许多层次。下部是粗砂,上部是一些较细的砂子,最上层是颜色较深的细土粒,而在水中悬浮着的,则是更细的土粒,这些土粒甚 First, what is soil colloid? Before we explain this noun, we first make a simple experiment: dig a small piece of soil and put it in a glass. After adding a little thick saline to moisten it, grind it with a finger into a slurry, then add boiling water Dilute, at this time, the entire glass department becomes turbid. When we look in later, we find that the earth in the cup has been divided into many levels. The lower part is coarse sand, the upper part is a number of fine sand, the uppermost is the darker color of fine soil, while the suspension in the water, is finer soil, these soil very