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
Does seed germination affect plant growth? Germination does affect plant growth Without germination in the plant, the plant is not capable to grow. The germination is the st

What does an anther have on it? The anther is the part of the flower that keeps the pollen. This and the filament both make up the stamen.

What are the major features of fishes associated to the habitat where they live? Fishes are all aquatic animals and therefore they have a hydrodynamic elongated body appropriat

Cutaneous larva migrans Cutaneous larva migrans, also known as creeping eruption, creeping verminous dermatitis or serpiginous eruption, is caused by larvae of many nematodes, viz

Abnormalities in the lipid profile are found in patients with diabetes mellitus. The lipid abnormalities increase the risk of heart disease in diabetics and hence should be regular

Explain Fixer1 Split S in second heart ? A2P2 interval is wide and persistent and doesn't change during respiratory cycle. It is an auscultatory hallmark of uncomplicated ostiu

Define Factors influencing the efficiency of bioconversion? amount of provitamin A presented to the 'cell, differential conversion by stereoisomeric form, and Vit

What are lichens? How do fungi participate in this ecological interaction? Lichens are produced by mutualist ecological interaction among fungi and algae or among fungi and cya

Q. Of which kind of tissue are bones and cartilages made? Cartilages and Bones tissues with great amount of intercellular material are formed of connective tissue. Q. Are t

In humans, the recessive allele that causes a form of red-green colour blindness (c) is found on the X chromosome. a) Determine the genotypes and phenotypes of the F1 generation fr