Soil consists of three phases , namely : liquid , gas and solids . Liquid phase is ground water that fills the parts or the whole of the empty space between the particles - solid particles.
One of the role of soil in agriculture is as a water storage area which is very important in relation to the cation , weathering of organic matter and micro activities of the bodies . This can only take place when both available water and air are sufficient .
One of the role of soil in agriculture is as a water storage area which is very important in relation to the cation , weathering of organic matter and micro activities of the bodies . This can only take place when both available water and air are sufficient .
Water retention by the soil due to the process of adhesion between water and land as well as the cohesion of water . Water was retained in the pores obtained micro well as the membranes that exist around the particle - particle ground . Water that is not held to fill the pores and then the macro will seep down because of the force of gravity .
Water in the soil can be classified into :
1 . Water gravity
2 . Capillary water
3 . Hygroscopic water
Water is water that gravity can not be retained by the soil , but seep under the influence of gravity and tension there between 0.1 and 0.5 atmosphere .
Capillary water is water that is normally sequestered in a layer around the particle is - soil particles and are in capillary spaces , as well as the voltage is between 0.1 and 31 atmosphere .
Hygroscopic water is water that is absorbed from the soil moisture by substances . This water attached to the surface of soil particles . This water attached to the surface of soil particles form a thin membrane composed of a layer of water molecules . This layer embedded nonvolatile strong that under ordinary circumstances . Hygroscopic water can not be absorbed by plants and are at voltages between 31 to 10,000 the atmosphere .
To determine the state of groundwater in relation to plant growth , it is necessary to set out the ground water levels in some circumstances , such as :
1 . Total water content
2 . Field capacity
3 . Permanent wilting point
Determination of soil water content can be done in several ways , namely :
1 . Gravimetric Method Water Content that is water weight ratio of soil to air-dry weight of soil ( moist ) soil or water weight ratio of the absolute dry weight .
2 . Volumetric Water Content way that the volume ratio of the volume of soil to groundwater .
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