5) ratio of carbon to nitrogen in the soil.The ratio of carbon to nitrogen (ratio C:N) is the value that is used to indicate the difficulty or ease of digestion of อินทรีย objects in the soil (carbon, nitrogen: 1 best) that affect carbon storage in soil, planted when the ratio of carbon to nitrogen in the soil. The rate of digestion of อินทรีย objects in clay is slow, because it is the ratio of carbon to nitrogen. Shows that there is less nitrogen in soil that does not have sufficient quantity of soil microorganism in digestion อินทรีย objects in clay (Faculty, Department of potphiwitya, 2548 (2005)) It has a catchment much carbon in soil from a study of Hoorman and Islam (2010) found that plant-bean family (Alfalfa) that there will be less protein. Amino acid and sugar accumulation in the trunk so much so that it was easily degrade soil microorganisms. Therefore, the soil in the area, it has high nitrogen consumption. Make the ratio of carbon to nitrogen in the soil less and have higher digestion rate. Make a small catchment in soil carbon in plant genera oak (oat) or wheat straw. (Wheat straw), there will be a lot of age protein and sugar accumulation in the trunk, but there is little on the nasasom is very resistant to digestion of soil microorganism. It is the ratio of carbon to nitrogen in the soil is higher. Soil microbial digestion, so it is difficult to have a the carbon catchment in the soil. By the ratio of carbon to nitrogen in the soil, most value of approximately 10: 1, and al Jagadammaet. (2007) found that areas with nitrogen fertilizer (280 kg N ha-1) will have a quantity of carbon in the soil (75.8 Mg ha-1) is greater than the area for which there is no nitrogen fertilizer (68.4 Mg ha-1) by the quantity of nitrogen that will increase the ratio of carbon to nitrogen in the soil decreased (at depths 0-10 cm), and result in a greater quantity of organic carbon in soil.
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