Hygroscopic coeflicient-retention of soil moisture, Biology

Hygroscopic Coeflicient

To have a more complete picture of soil moisture relations, let us take a soil sample and oven dry it for 24 hours at 11oC. Now if this soil is kept in an atmosphere which is completely saturated with water vapour, the soil will absorb some water, which makes a thin film around the soil particles. The water is held tightly and can move only in the vapour phase. The moisture at this point, absorbed by a unit weight of dry soil is termed the hygroscopic coefficient . As might be expected, soils high in colloidal materials will hold more water under these conditions than the sandy soils. Soil moisture is sometimes expressed in terms of pF, which has a range from 0 to 7. The pF is the logarithm of capillary potential. The pF-0 represents saturated soil, 2.7 represents the field capacity, 4.2 the permanent wilting percentage, 5.5 the air dry level, and 7.0 the oven dry conditions. At the same pF, the actual amount of moisture content is higher in clay than in sand.

Posted Date: 12/11/2012 2:16:16 AM | Location : United States







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

Write discussion on Hygroscopic coeflicient-retention of soil moisture
Your posts are moderated
Related Questions
Q. What is the difference between smallpox (variola) and measles? The Smallpox is a viral infection like measles. The Smallpox is transmitted by respiratory secretions, saliva

Which is better to grow plants in Rock sand or soil? When we grew plants inside, with there is no wind, and the plants in the rocks grew improved than the plants that were grow

what is the meaning of heterotropic mode of nutrition. with examples.

Checkpoints and Cell Cycle Control Cell cycle checkpoints are control mechanisms which ensure the fidelity of cell division within eukaryotic cells. These checkpoints confirm w

Effects on Health - Water Pollution Water pollution deteriorates the quality of water used for drinking, bathing, swimming, recreation and irrigation. Water contaminated with

Explain the Inoculating Loops and Needles? These are most commonly used tools for inoculation. The inoculating loop consists of insulating handle at the end of which inoculatin

Determine amount of intracellular potassium ions in neuron A Neuron A is a healthy neuron with all the usual ion channels.  When at rest with a membrane voltage of R millivolts

Explain the Principle of Development The final guiding principle is that assessment involves the measure of change, or development, across multiple levels of analysis. Developm

Which of the following is an effect of the following drugs? A. Drug A is an agonist of the Vasopressin2 Receptor (V2R).  High levels of Drug A in the extracellular spaces surro

Convulsive Disorders Definition Convulsion is a series of forceful in voluntary contraction and relaxation of voluntary muscles due to disturbance of brain function. It i