Korean Journal of Soil Science and FertilizerISSN:0367-6315(Print) 2288-2162(Online)한국토양비료학회

Organic matter is a substance that contains carbon. When applied to soil, it can improve the physical and chemical properties of soil and supply nutrients to plants. Also, it is decomposed in soil due to microbe activity, or absorbed and utilized by crops. The remaining differential to materials is accumulated in the soil and increases the level of organic matter in soil. Given that the humidity and temperature are appropriate, and there are energy sources favorable for microbe activity, the decomposition rate is higher, thus resulting in the increase of the nutrient availability of crops. Therefore, we analyzed the types of carbon content according to time while cultivating beans in soil with 4 different kinds of organic matter applied. Total carbon content (TC) was higher in organic matter application than in control (non- organic matter). Among the other organic matters, it was especially high in livestock manure compost (LMC) application with 11.1 g kg^-1. Hairy vetch (HV, 8.9 g kg^-1), oil cake (OC, 8.9 g kg^-1), and rice straw (RS, 8.2 g kg^-1) did similar. According to soil carbon form, Humin carbon(HnC) had the highest total carbon contrast of 62.0 %, Humic acid carbon(HaC) had 19.6%, and Fulvic acid carbon(FaC) had 18.1%. This pattern was the same in both control and organic matter application. Every type of carbon was the highest in LMC application. TC levels were temporarily high in June, which was after organic matter application, and decreased. It was higher than any other organic matter application in LMC. HaC increased in May and June which was when the organic matter was applied, slightly decreased in July, and were the highest in LMC with TC. FaC slowly increased after organic matter application until March and slowly decreased afterwards. It was highest in LMC, and similar in HV, OC, and RC, which shows that it had the smallest difference of content between kinds of organic matter. HnC inclined to decrease slowly as time passed after organic matter application, but rapidly increased in July and June. Also, it was the highest in LMC, and similar in HV, OC, and RC. Therefore, it was concluded that LMC, which had a high level of humin carbon that is difficult to decompose, was the best for accumulating carbon in soil.

Total carbon content(TC) as affected by the difference of organic matter in subjected soils.