Retention of soil moisture, Biology

Retention of Soil Moisture

The movement of water into and within the soil, moisture storing capacity of soils and the availability of moisture to plants are governed by soil properties. Each of these factors is related directly or indirectly to the size and distribution of soil pores and the affinity of particles to moisture. To understand these aspects more clearly, we shall now discuss a few concepts given below.

Maximum Retentive Capacity: Let us take the example of soil that is well granulated, silt loam, and has a uniform texture and structure. After heavy rain or irrigation, as waterenters the soil, air is displaced and the soil pores whether large or small are filled with water. At this point the soil is said to be saturated and is at its maximum retentive capacity.


Field Capacity:
In the same soil as above, if we cut off the supply of water, that is, if there is no further rain, or we shut off imgation water, there would berelatively rapid downwardmovehent of soine of the water. After a day or so, this rapid downward movement could cease. At this point we can find that the water from the larger pores or the macropores has drained out and its place is taken by air. The smaller pores or the micropores are still filled with water, and it is the main source from where plant roots absorb water. So the field capacity refers to the water content in the soil after gravitational water has drained away.

Wilting Coefficient: Plants absorb water from the soil and reduce the quantity of moisture in the soil as they lose water to the atmosphere by transpiration through their leaves. The second avenue of loss is evaporation directly from the soil surface. Both these losses are taking place simultaneously and are responsible for a markedlv rapid rate of water dissipation from soils.

Posted Date: 12/11/2012 2:14:10 AM | Location : United States







Related Discussions:- Retention of soil moisture, Assignment Help, Ask Question on Retention of soil moisture, Get Answer, Expert's Help, Retention of soil moisture Discussions

Write discussion on Retention of soil moisture
Your posts are moderated
Related Questions
Respiratory Gases -Respiration Physiologically the most important gases are oxygen, carbon dioxide and nitrogen. Molecular oxygen comprises 21% of the atmosphere; carbon diox

Q. Show the process of Construction of Keys? Keys are constructed using contrasting characters. The possible names in the key are divided into smaller and smaller groups. Each

Q. Will Sedantary Lifestyle increased risk for CAD? A sedantary life style is associated with increased risk for CAD. Sedentary persons have almost double the risk for CAD deat


Define role of Vitamin K in controlling gene expression? Prithrombin, a protein required for blood clotting is assembled with a large number of glutamic acid residues. In the p

Non living vs. Living matter As is clear from above   account the energy of matter resides in its chemical organization. The total potential chemical energy, entrapped as b


Promotion - Stages of carcinogenesis The second stage or promotion is reversible and does not include changes in structure of DNA but rather in the expression of the genome of

Explain about the Gel bands detection techniques? Gel bands, resulting from a gel electrophoretic separation, may be detected by staining, radioactive counting or immunoblottin

why does the removal of the extremity of coleoptile prohibit plant growth?