Hygroscopic coeflicient-retention of soil moisture, Biology

Assignment Help:

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.


Related Discussions:- Hygroscopic coeflicient-retention of soil moisture

Decomposers, 5 beneficial effects of decomposers and 2 harmful effects

5 beneficial effects of decomposers and 2 harmful effects

Stratification, Stratification On the basis of the variation in air tem...

Stratification On the basis of the variation in air temperature. the atmosphere has been divided vertically into four layers: (figure shown below) thee troposphere, stratospG,

Reducing cost of accident, Reducing Cost of Accident One clear way to ...

Reducing Cost of Accident One clear way to control the cost of accident would be to follow all the rules of book for safety. All the methods of safety which were described ear

Show the apical view of transducer position, Q. Show the Apical View of Tra...

Q. Show the Apical View of Transducer Position? For the patient with dextrocardia transducer is kept on right chest with marker towards left side. Morphological parameters to

Haustorial behavior of embryo sac, Haustorial Behavior of Embryo Sac ...

Haustorial Behavior of Embryo Sac There are instances in which the entire embryo sac may grow beyond the ovular tissue. The central cell may also form multicellular projectio

Which type of molecule does each of these enzymes break, Besides the pancre...

Besides the pancreatic juice in the intestine there is the releasing of the enteric juice that having digestive enzymes too. What are these enzymes and which type of molecule does

Determination of the age of fossil, DETERMIN A TIO N OF THE AGE OF FOSSI...

DETERMIN A TIO N OF THE AGE OF FOSSIL - Radioactive clock (Boltwood -1907) - Half life of uranium is 4.5 billion years. This means half of total uranium disintegrates

Define classification of fats and fatty acids, Define Classification of Fat...

Define Classification of Fats and Fatty Acids? You must be wondering in this unit on lipids why we are talking about fats and oils and not using the term lipids. Definitely whe

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd