The Quantitative Relationship between Soil Structure and Field Moisture Capacity

On the basis of Based on series of synchronous test data of soil bulk density and field moisture capacity of nine kinds of soils that were taken from Jinzhong basin in Shanxi province,the change characteristics of field moisture capacity with soil bulk density ware revealed,and the quantitative relationship between field moisture capacity and soil bulk density was established.The results show that the field moisture capacity of different soil texture changed with the soil bulk density.With increasing soil bulk density,the field moisture capacity increased gradually.reached maximum,then decreased.The maximum of field moisture for different soil texture was different,and the maximum of field moisture capacity occurred when the porosity changed from 42 percent to 46 percent.There was a close quadratic polynomial function relationship between field moisture capacity and soil bulk density,and a satisfactory result was achieved through the quadratic function to predict field moisture capacity by soil bulk density.