In order to evaluate the beneficial functions for organic farming, we have divided beneficial functions as 9 sub-functions such as flooding control, fostering water resources, purifying the air, mitigating summer climate, purifying water quality, decreasing soil erosion, accumulating soil carbon, conserving biodiversity, and preventing accidents from pesticides. They were quantified by searching related reports and statistics, and surveying fields. Organic farming, especially organic paddy fanning, showed that some functions like fostering water resources, accumulating soil carbon, conserving biodiversity, and preventing accidents from pesticides were higher than conventional paddy fanning, while for the others were similar. The fostering water resources function was evaluated as 4,297 ton/ha.year an increase of about 3.6% compare with that of conventional farming. A New function for accumulating soil carbon at organic paddy fields has been assessed by 4.67 ton/ha in terms of long periods over 10 years. Considering the area of organic paddy farming in Korea and value of carbon price, it the monetary value is 22.4 to 84.1 billion won using the new method. It could be also evaluated that flooding control, fostering water resources, purifying the air, mitigating summer climate, purifying water quality, decreasing soil erosion, and preventing accidents from pesticides were value at 2,980, 123.4, 482.6, 87.5, 0.9, 55.6, and 284.1 billion won, respectively. Conserving biodiversity function would be a very big benefit of organic farming though it couldn't be evaluated as monetary value.
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