The Role of Soil Organic Matter

1, An important source of plant nutrients. The decomposition of soil organic matter can provide various nutrients for plants, especially nitrogen. Because the soil minerals - generally do not contain nitrogen, in addition to the application of nitrogen fertilizer, the main source of soil nitrogen is provided by the decomposition of organic matter. The carbon dioxide produced by the decomposition of soil organic matter can supply the needs of green plants for photosynthesis. In addition, organic matter is also, the main source of phosphorus, sulfur, calcium, magnesium and trace elements in the soil.

2, Improve the retention and buffering of the soil. Organic colloids in soil organic matter with a large number of negative charges, can adsorb a large number of cations and water, its cation exchange capacity (CEC) and water absorption rate than the soil clay particles to several times to dozens of times, so it can improve the fertilizer storage capacity of the soil, while improving the buffering of the king soil to acid and alkali.

3, Improve the physical properties of the soil. The viscosity of soil organic matter is much smaller than that of clay particles, only a fraction of the viscosity of clay particles. It accounts for only a few percent of the viscous particles. On the one hand, it can reduce the viscosity of clay soil, reduce tillage resistance and On the other hand, it can improve the agglomeration of sand particles and improve their excessively loose On the other hand, it can improve the agglomeration of sand particles and improve their overly loose condition. Soil organic colloids are indispensable cementing substances for the formation of a water-stable agglomerate structure. helps clay grains to form a good agglomeration structure, thus improving the pore condition and water/air ratio of the soil. air ratio. In addition, because the organic matter is dark, it is good for absorbing heat and can improve the low temperature.

4, Promote the activity of microorganisms; reduce or eliminate pesticide residues and heavy metal pollution in the soil; Stimulating effect on crop growth. Low concentrations of huminic acid and fulvic acid on certain physiological crop process, such as promoting root growth, improving the absorption of nutrients by the root system, accelerating the physiological processes are promoted by low concentrations of huminic acid and fulvic acid.