These three mechanisms allow for longterm buildup and availability of organic matter: biochemical recalcitrance – the complexity of the organic matter composition (carbohydrates, lignin etc.) Relationships between soil lightness, soil organic matter (SOM) composition, content of organic C, CaCO 3, and texture were studied using 42 top‐soil horizons from different soil types located in southern Germany.SOM composition was determined by CPMAS 13 C NMR spectroscopy, soil color was measured by diffuse‐reflectance spectrophotometry and given in the CIE L*a*b* color … The chemical composition of the soil, the topography, and the presence of living organisms determines the quality of soil. To determine whether there is a relationship between the composition of soil organic matter and the activity of the soil microbial biomass, the composition of the organic matter in 12 typical arable soils in Northwest Germany was investigated by wet chemical analysis and CPMAS cross polarization magic angle spinning 13C-NMR spectroscopy. Soil organic matter is preserved in three different ways. composition, soil temperature, soil moisture and other soil management factors. These include, in varying proportions and many intermediate stages, an active organic fraction including microorganisms (10-40 percent), and resistant or stable organic matter (40-60 percent), also referred to as humus. Soil organic matter consists of decomposing plant and animal residues. New York: Wiley, 1984. In order to sustain plant life, the proper mix of air, water, minerals, and organic material is required. The weeds including green manuring crop ploughed into the soil serve as a good source of organic matter in the cultivated soil. Soil organic matter equilibrium Soil properties affect SOM retention Soil texture and drainage affect the capacity of soil to retain OM. How much organic matter you will have to add depends on your soil’s composition, the size of your garden and your climate. Heavier-textured soils (e.g., clays and clay loams) are better able to protect OM from In this Soil N is an indicator of peat decomposition based on relationship of functional group C and total N. Future surveys of soil organic matter biogeochemical parameters and C chemical composition should be pursued. Soil organic matter contributes to soil productivity in many different ways. Soil organic matter consists of a variety of components. A good supply of soil organic matter is beneficial in crop or forage production. Consider the benefits of this valuable resource and how you can manage your operation to build, or at least maintain, the organic matter in your soil. References. In general, soil contains 40-45% inorganic matter, 5% organic matter, 25% water, and 25% air. After the harvest of the crops, the roots and stubbles are left in the soil which are converted into organic matter by soil organism and make also a considerable contribution of soil organic matter. Both the texture and ph of the soil are worth knowing and these can vary throughout your garden or plot. Soil organic matter – composition, decomposition, mineralization and immobilization SOIL ORGANIC MATTER Substances containing carbon are organic matter. Soil organic matter is the fraction of the soil that consists of plant or animal tissue in various stages of breakdown (decomposition). 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