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
Avian reovirus infections There are several avian reoviuses isolated from chicken, turkey and other species of birds. They are associated with arthritis (tenosynovitis), respir

Benefits of energy pyramids

what are the properties of synapses

Explain about Posterior wall Posterior wall separates the antrum from the infra-temporal fossa and contains two important structures. Posterior superior alveolar nerve and

M a s s a g i n g and tumbling techniques To improve the desirable characteristics of meat products massaging and tumbling techniques were developed. Massaging involves

Define Initiation phase - mechanism of protein synthesis ? The assembly of a ribosome on an mRNA molecule at the correct start point, the initiation codon. Three initiation fac

Define Historic Example of Evolutionary quantitative geneticists? Evolutionary quantitative geneticists have developed tools to create predictions about the short-range evoluti

Water is most dense and thus heavier at 4 degreese celceus. At 0 degreese celceus ice forms and can float on liquid water. Assuming that ice were most dense at 0 degreese celceus,

what compound is phosphorylated for ATP? what is the resulting compound when ATP releases energy

Omnispective Classification This is the extension of the concept of natural classification put forward by Black Welder (1967). The approach seems quite realistic and pragmatic.