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Evaluating germination of lettuce and soluble organic carbon leachability in upland sandy loam soil applied with rice husk and food waste biochar

왕겨 바이오차 및 음식물쓰레기 바이오차가 밭 사양토에서 상추발아 및 수용성 유기탄소 용출에 미치는 영향 평가

  • Han, Kyung-Hwa (Soil and Fertilizer, National Academy of Agricultural Science, RDA) ;
  • Zhang, Yong-Seon (Soil and Fertilizer, National Academy of Agricultural Science, RDA) ;
  • Jung, Kang-Ho (Soil and Fertilizer, National Academy of Agricultural Science, RDA) ;
  • Cho, Hee-Rae (Soil and Fertilizer, National Academy of Agricultural Science, RDA) ;
  • Sonn, Yeon-Kyu (Soil and Fertilizer, National Academy of Agricultural Science, RDA)
  • 한경화 (농촌진흥청 국립농업과학원 토양비료과) ;
  • 장용선 (농촌진흥청 국립농업과학원 토양비료과) ;
  • 정강호 (농촌진흥청 국립농업과학원 토양비료과) ;
  • 조희래 (농촌진흥청 국립농업과학원 토양비료과) ;
  • 손연규 (농촌진흥청 국립농업과학원 토양비료과)
  • Received : 2014.10.16
  • Accepted : 2014.11.12
  • Published : 2014.12.31

Abstract

This study was carried out to evaluate the effect of rice husk (RHB) and food waste biochar (FWB) on upland soil with sandy loam texture, in terms of physico-chemical analysis, lettuce seed germination test, and orgainc carbon leaching experiment. RHB and FWB had different physico-chemical properties each other. Carbon to nitrogen ratio (C/N ratio) of RHB was 32, showing two times higher than that of FWB. FWB had high salt and heavy metal content, compared to RHB. This is probably due to different ingredients and production processing between two biochars each other. Results of germination test with Lettuce showed lower germination rate when FWB was applied because of higher salt concentration compared to control and RHB. Organic carbon leaching test using saturated soil column (${\Phi}75{\times}h75mm$) with $10MT\;ha^{-1}$ biochar application rate, showed higher saturated hydraulic conductivity in rice husk biochar treatment column, compared to control and food waste biochar treatment. The highest total organic carbon concentration in column effluent was lower than those in both of rice husk biochar and food waste biochar, whereas the differences was negligible after 9 pore volumes of effluent. Consequently, biochars from byproducts such as rice husk and food waste in sandy loam textured upland soil could enhance a buffer function such as reduction of leaching from soil, but the harmful ingredient to crops such as high salt and heavy metals could limit the agricultural use of biochars.

Acknowledgement

Supported by : 국립농업과학원

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