It is a mixture of many different things including rock, minerals, water and air.Soil also has living things and dead things in it. Biological value (BV) is a measure of the proportion of absorbed protein from a food which becomes incorporated into the proteins of the organism's body. Temperature of soil depends upon the temperature of atmospheric air and on moisture content. For example, soil protozoa consume enormous numbers of bacteria and even some fungal spores. Although soil biota, which includes living roots and soil organisms, occupies a very small fraction of the total soil volume (<0.5 %), it has tremendous influences on soil properties and soil processes. It is edited by a working group of the International Union of Soil Sciences (IUSS). Its formation is related to the parent Rock material, relief, climate, and vegetation. Biological properties. Some important physical and chemical properties of soil are mineral content, texture, cation exchange capacity, bulk density, structure, porosity, organic matter content, carbon-to-ni-trogen ratio, color, depth, fertility, and pH. Soil is the loose material which forms the thin surface layer of Earth. Compost (/ ˈ k ɒ m p ɒ s t / or / ˈ k ɒ m p oʊ s t /) is organic matter that has been broken down into simpler organic or inorganic matter in a process called composting. Lunar soil is the fine fraction of the regolith found on the surface of the Moon.Its properties can differ significantly from those of terrestrial soil.The physical properties of lunar soil are primarily the result of mechanical disintegration of basaltic and anorthositic rock, caused by continual meteoric impacts and bombardment by solar and interstellar charged atomic particles over years. This process recycles various organic materials otherwise regarded as waste products and produces a soil conditioner (the compost).. Compost is rich in nutrients. feeding) levels. Assessing soil quality involves measuring physical, chemical, and biological soil properties and using these measured values to identify properties of the soil that may be inhibiting soil function or to monitor how changes in management are affecting soil … Proteins are the major source of nitrogen in food. Soil life can be divided into trophic (i.e. These particles are classified as gravel, sand, silt and clay […] The soil temperature greatly affects the physico-chemical and biological processes of the soil. Soil quality is an effective tool for monitoring soil function. The changes that are caused by soil organisms have their impact on soil fertility and productivity. A soil’s physical and chemical properties affect plant growth and soil management. It is controlled by climate, colour of soil, slope, and altitude of the land and also by vegetational cover of the soil. The soil food web shows what a healthy soil needs in the way of soil life; this ranges from worms, springtails, moles to fungi and bacteria. A sterile soil is not a soil in the real sense. This chapter provides a basic description of soil properties and processes, stressing the concept that the soil is a dynamic entity where complex interactions among its biological, chemical and physical components take place. A. ADVERTISEMENTS: Soil Texture refers to the particle sizes composing the soil. At the base of the trophic levels lies the soil microbial population which degrades plant, animal and microbial bodies, and also serves as the food source for some of the levels above it. They all live in a food web and depend on each other and their environment. Abstract. Physical Properties: The physical properties include texture, structure, and colour. 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