EFFECT OF BULK DENSITY ON SOIL WATER POTENTIAL IN MEDIUM LOAM SOIL OF AGRICULTURE.

Based on loam soil in different design density 1.4 g/cm³, 1.5 g/cm³, 1.6 g/cm³, we had done the test of the changes relationship between the soil containing water and the soil water potential, and analyzed the soil water potential trends of the loam soil in the design of different bulk density. The results show that the value of loam soil water potential is in the range of 57 to 140 kpa under the same soil containing water (gravimetric water content 12.5%) and the design of three soil bulk density, and present that the greater the soil bulk density, the smaller the soil water potential. The changing range of them is in trend of decreasing. All of these experimental studies will be benefit to choose the suitable discharge of the dripper for drip irrigation system, and make full use of the natural energy of the soil water potential, using it as the control index of irrigation system. At the same time, these results can provides a theoretical basis further for researching on the crop root zone soil moisture migration regularity and determining the optimal soil moisture environment. [ABSTRACT FROM AUTHOR]