A STUDY ABOUT SOIL WATER CHARACTERISTIC,CONDUCTIVITY OF WATER AND EQUILIBRIUM ADSORPTION OF CUPRIC ION IN SOIL——A UTILITY EQUIPMENT USED IN SOIL SCIENCE AND ITS ILLUSTRATION OF USE

A utility equipment used in soil science is designed and installed.The equipment can be used in research pro-grams of soil water and solute transport.Pressure in pressure chamber of the equipment in which a tested soil sam-ple is laid can be adjusted exactly so that we can determine the water content of soil sample.With the equipmentwe can not only study the problems related water movement in soil but also measure some solute,such as cadmi-um,plumbum and so on,adsorption on surface of soil in saturated and unsaturated state.As an illustration of theuse of the equipment,we give the isothermal of cupric ion adsorption in soil.This equipment can be used in the re-search work and application of soil science.