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
The human heart is a cone-shaped, four-chambered muscular pump located in the mediastinal cavity of the thorax between the lungs and beneath the sternum, designed to ensure the cir

What is Hazard Identification Hazard  Identification :  The  identification  of  known  or potential  health effects associated with  a  certain  agent.

What do you understand by Metanephridia? An excretory-osmoregulatory organ comprising a ciliated funnel, nephrostome, connected to tubules that lead to the external nephridiopo

Why lymph is also called middle man of body

Primitive Nervous System - Nerve Net A nervous system creates its appearance for the first time in the phylogeny among Cnidaria. In this group the nerve cells make an irregula

Exocytosis in a skeletal muscle?   A.  During exocytosis in a skeletal muscle, there will be release of calcium ions from intracellular vesicles in the sarcoplasmic reticulum i

Define the Functions of Vitamin A? Vitamin A (retinol) is an essential nutrient needed in small amounts by humans for the normal functioning of the visual system, growth and de

Explain about the Salting - Methods of Food Processing? Salting: Salting, especially of meat, is an ancient preservation technique. Food is treated with salt or a strong salt s

List the reactions that need to be circumvented by the special reactions in gluconeogenesis. The reactions that are circumvented  include: Between pyruvate and phosphoenolpy

Which of the below refers to science concerned with the application of genetic principles to improvement of the human species? a) Eugenics b) Assortive mating c) Holandri