Mineralisation and humification-formation of soil, Biology

Mineralisation and Humification

As a result of physical weathering, the rocks are broken down into smaller particles. But this is not the true soil, and plants cannot grow well in the disintegrated rock material alone. The weathered material, however, undergoes further changes, that you would study in this section. You might have noticed that during weathering, mostly physical and chemical factors are involved, whereas for the further development of soil, that is mineralisation and humification, mainly the biological agents are involved.

During the early stages of soil formation, organic matter in the soil is not very high, as the vegetation and the soil fauna are not much developed. In such soils, algae, lichens, mosses, and other small form of plants grow and contribute organic matter through their death and decay. In due course of time, various types of plants, animals and microorganisms colonise such soils. They also contribute organic matter to the soil, in the form of wastes or their dead remains. This organic debris then breaks down into simpler products. This breakdown process, also known as decoinposition is brought about by different kinds of micro organisms such as bacteiia, fungi, and actinomycetes. They break the organic substances into various compounds such as polysaccharides, proteins, fats, lignins, waxes, resins and their derivatives. These compounds are further broken down into simple products such as carbon dioxide, water and minerals. This latter process is called mineralisation. The residual, incompletely decomposed organic matter left after mineralisation is called humus and the process of its formation as humification. Humus is an amorphous, colloidal and dark substance that is the source of energy and nutrients for most soil microorganisms. Humus is important, as it gives the soil a loose texture ensuring better aeration. Being colloidal in nature, it has a great capacity for imbibing and retaining water and nutrients. Humus, greatly improves the soil fertility.

Posted Date: 12/11/2012 1:27:29 AM | Location : United States

Related Discussions:- Mineralisation and humification-formation of soil, Assignment Help, Ask Question on Mineralisation and humification-formation of soil, Get Answer, Expert's Help, Mineralisation and humification-formation of soil Discussions

Write discussion on Mineralisation and humification-formation of soil
Your posts are moderated
Related Questions
Phylum Phaeophyta (brown algae) 1) They are brown algae, apart from chlorophyll they have brown pigment i.e. fucoxanthin which predominates. 2) They are one of ,the most com

Define Drug Effects on Food Intake - Anorexic Effect? Have an anorexic effect, either as a direct effect of the drug on appetite e.g., some antibiotics or because of side-effec

Blastulation  Formation of blastula from morula is called as blastulation. During early cleavage the blastomere maintain spherical shape and mulberry like, this stage of emb

Enumerate about the Reitan Aphasia Screening Test This test serves two purposes in that it contains both copying and language-related tasks. As an Aphasia screening procedure,

Why Pulses are important for human - nutritional factor? Pulses are rich sources of proteins (20-25 g/100 g), the limiting amino acid being methioniize. However, protein quality

Neuston - Aquatic Ecosystem These are unattached organisms which live at the air-water interface such as floating plants and several types of animals. Some spend most of their

i want to extract my compound of interest from tlc i m finding some enzyme inhbitor from microbial source can you plzz suggest me how to prepare nad get my compound

Nature: Matter and Energy Nature is not just our immediate surrounding or environment, but is the whole Universe of Cosmos. Study of the origin   and topography of cosmos is ca

Explain how a human eye is working for the body. Every tissue in the body requires basic components which are either derived from the body itself or we acquire them from extern