5. the carbon-nitrogen ratio of the per) in the soil.Carbon-nitrogen ratio of the per (ratio C:N) is the value that is used to indicate difficult or easy degradation of organic matter in the soil (carbon per nitrogen part 1) that affects carbon retention in the soil when the ratio of nitrogen in soil carbon per lot. The rate of decomposition of organic matter in the soil occurs slowly due to carbon-nitrogen ratio of the per lot. Shows that there is less nitrogen content in the soil, which is not enough for the needs of the soil microorganisms in the decomposing organic matter in the soil (Faculty, Department of potphiwitya, 2548). The retention of carbon in soil from the study of Islam and Hoorman (2010) found that leguminous plants (Alfalfa) is to have the protein. Amino acids and sugars accumulate in stems, thus making the degradation by microbes is easy. Therefore, the soil in the area, it has a high nitrogen content. Making carbon-nitrogen ratio of the per in the soil with high degradation rate. Make carbon retention in soil with little but the oak genus (oat) or wheat straw. (Wheat straw), the age of many proteins and sugars accumulate in stems, but there are many nasasom on the lip, which is resistant to degradation of soil microbes. Thus, carbon-nitrogen ratio of the per in the high. Soil microorganisms, thus decomposing. carbon retention in soil are very. By a ratio of nitrogen in soil carbon per mainly is about 10:1, and al Jagadammaet. (2007) found that areas with nitrogen fertilization (280 kg N ha-1) will have a carbon content in soil (75.8 ha-1 Mg) than areas without fertilizing nitrogen (68.4 Mg ha-1) by increasing nitrogen content will cause the ratio of nitrogen in soil carbon per (depth 0-10 cm) and has resulted in more soil organic carbon.
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