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
TYPES OF NURSING UNITS: The design of nursing unit should maximize the function of the unit by following its task. The design of nursing unit has also under gone a radical cha

PROVIDE a specific example for epithelial and connective tissues, how the arrangement of cells helps with tissue functioning?

BIO GEOGRAPHICAL EVIDENCE- The patterns of distribution of animals and plants in different parts of the globe are termed as biogeography. It is believed that around carbo

Define Foaming Properties, Binding of Flavour and Other Substances? To understand the foaming properties of proteins, we need to know some basic aspects of foam foods. Foam foo

Q. Where are the adrenal glands located? How many are they and what are their portions? Each adrenal gland is located on the top of each kidney (forming a hat-like structure fo

Define crucial periods of a woman's life - pregnancy and lactation? In this unit, we studied about the most crucial periods of a woman's life, pregnancy and lactation, especial

Pyruvate carboxylation Pyruvate carboxylation : In this reaction, pyruvate, CO,  and ATP are converted to oxaloacetate, ADP and Pi catalysed by the enzymepyruvate carboxylase

To show the respiration of a plant Place the plant in a test tube held in a weighted wooden block. Put this in a bowl having lime water and cover the plant with a jar. Keep the

Considering the nature of negative-feedback control and the function of the respiratory system, what effect do you predict that a decrease in CO2 in the internal environment would

A proton accelerates from rest in a uniform electric field of 650 N/C. At some later time, its speed is 1.3 106 m/s. (a) Find the magnitude of the acceleration of the proton. m/s2