Effects of Co-digestate application on the Soil Properties, Leachate and Growth Responses of Paddy Rice

통합혐기소화액의 시용이 벼 생육 및 논토양 환경에 미치는 영향

  • Hong, Seung-Gil (Climate change & Agroecology division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Shin, Joung-Du (Climate change & Agroecology division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Kwon, Soon-Ik (Climate change & Agroecology division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Park, Woo-Kyun (Climate change & Agroecology division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Lee, Deog-Bae (Climate change & Agroecology division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Kim, Jeong-Gyu (College of life science & Biotechnology, Korea University)
  • 홍승길 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 신중두 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 권순익 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 박우균 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 이덕배 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 김정규 (고려대학교 생명과학대학)
  • Received : 2010.11.17
  • Accepted : 2010.12.15
  • Published : 2010.12.31

Abstract

Livestock manures have a potential to be a valuable resource with an efficient treatment. In Korea, 42 million tons of livestock manure were generated in 2008, and 84 % of them were used for compost and liquid fertilizer production. Recently recycling of livestock manure for biogas production through anaerobic digestion is increasing, but its utilization in agriculture is still uncertified. In this study, there was applied co-digestate to the paddy for rice cultivation based on N supplement. Co-digestate was fertilizer fermented with pig slurry and food waste combined with the ratio of 70:30(v:v) in its volumetric basis. For assessing the safety of co-digestate, it was monitored the contents of co-digestate for seasonal variation, resulted in no potential harm to the soil and plant by heavy metals. The results showed that soil applied with co-digestate was increased in exchangeable potassium, copper and zinc mainly due to the high rate of pig slurry in co-digestate applied. Considering high salt content due to the combination with food waste, strict quality assurances are needed for safe application to arable land though it has valuable fertilizer nutrient. Leachate after treatment showed that the concentration of nitrate nitrogen washed out within two weeks. Considering the salt accumulation results in soil, it is highly recommended that the application rate of co-digestate should not exceed the crop fertilization rate based on N supplement. With these results, it was concluded that co-digestate could be used as an alternative fertilizer for chemical fertilizer. More study is needed for the long-term effects of co-digestate application on the soil and water environment.

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