Soil mixing, Biology

Soil Mixing

The larger soil organisms are responsible for considerable mechanical mixing and weathering of soil. The wedge-like action of roots and other underground plant organs, widens the fissures in rocks and the compacted soil so that they are more susceptible to other forms of weathering. Rodents, insects and worms turnover great amounts of soil, with the result that the material is repeatedly exposed to the physical and chemical agents of weathering. One of the most important organism in this regard is earthworm. These are - important in many ways. The amount of soil that these creatures pass through their bodies annually may amount to as much as 15 tons of dry earth per acre. a startling figure! During the passage through the worms, not only the organic matter which serves the earthworm as food, but also the mineral constituents are subjected to digestive enzymes and to a grinding action within the animal. There is usually an abundant growth of grass around earthworm casts. this suggests an increased availability of plant nutrients therein. Thus the activity of earthworm not only mixes the soil, but also makes it fertile by increasing its aeration and drainage. They also bring the lower soil to the surface. They mix and granulate the soil by dragging into their burrows, large quantities of undecomposed organic matter such as leaves and grass. which they use as food.

Burrowing animals dso bring great quantities of subsoil to the surface. In addition, these animals cut and bury the litter of which some is used for food ahd some as nesting material. The latter, together with their excreta buried below the surface, greatly increase the organic content which contribute to soil fertility.

Posted Date: 12/11/2012 2:49:07 AM | Location : United States







Related Discussions:- Soil mixing, Assignment Help, Ask Question on Soil mixing, Get Answer, Expert's Help, Soil mixing Discussions

Write discussion on Soil mixing
Your posts are moderated
Related Questions
Q. Goal of dietary management for GDM? The goal of dietary management for GDM is to provide the pregnant woman with adequate energy, commonly known as "calories", and to ensure

Chromosomes, colored bodies, are composed of proteins and DNA; so are chromatids. At metaphase I there are 46 chromosomesaligned in pairs along the human cells equatorial plate. At

Q. Explain Right Atrial Enlargement ? The right atrium (RA) is a globular chamber, forming the right heart border on the PA view. On the PA view, the border of the enlarged RA

Right coronary artery arises from the anterior aortic sinus. It runs down along the anterior part of the coronary sulcus, reaches the lower border of heart turns round the lower bo

Determine sequence weights for the sequences ACTA, ACTT, CGTT, and AGAT in problem 1 by using Thompson, Higgins, and Gibson method

Define Fluids required for underweight - nutritional care? Take fluids only after a meal instead of with or before meals so that food intake is not reduced. High calorie nouris

Natural versus Artificial (Man-made) Environment The environments discussed so far are, natural environments. In several instances man has greatly altered the natural condition

Explain the steps of converting food into energy. There are four steps to convert food into energy: a) Ingestion, mastication and swallowing : Ingestion or taking in of food

It is a newer agent that inhibits cholesterol absorption by the enterocyte. It reduces cholesterol absorption by the enterocyte. It reduces cholesterol absorption by 23 per cent-50

Explain Adverse effects of Emtricitabine  Emtricitabine can cause hyperpigmentation of the palms and soles, particularly in dark-skinned patients. Because emtricitabine is also