Effects of Condensed Molasses Soluble on Chemical and Biological Properties of Soil, and Nitrogen Mineralization

당밀농축용액이 토양의 화학 및 생물학적 성질과 질소의 무기화에 미치는 영향

  • Kang, Gwan-Ho (Division of Environmental and Agricultural Science, Sunchon National University) ;
  • Kang, Byung-Hwa (Division of Environmental and Agricultural Science, Sunchon National University) ;
  • Park, Ki-Do (National Yeongnam Agricultural Experiment Station, RDA) ;
  • Chung, Keun-Yook (Department of Agricultural Chemistry) ;
  • Sohn, Bo-Kyoon (Division of Environmental and Agricultural Science, Sunchon National University) ;
  • Ha, Ho-Sung (Department of Agricultural chemistry, Gyoungsang National University) ;
  • Heo, Jong-Soo (Department of Agricultural chemistry, Gyoungsang National University) ;
  • Cho, Ju-Sik (Division of Environmental and Agricultural Science, Sunchon National University)
  • 강관호 (순천대학교 환경농업과학부) ;
  • 강병화 (순천대학교 환경농업과학부) ;
  • 박기도 (영남농업시험장) ;
  • 정근욱 (충북대학교 농과대학 농화학과) ;
  • 손보균 (순천대학교 환경농업과학부) ;
  • 하호성 (경상대학교 농화학과) ;
  • 허종수 (경상대학교 농화학과) ;
  • 조주식 (순천대학교 환경농업과학부)
  • Received : 2003.12.19
  • Accepted : 2004.03.05
  • Published : 2004.04.30

Abstract

This study was carried out to evaluate the effects of condensed molasses soluble (CMS) treatment on the mineralization of N, chemical properties and soil microbial population under the incubation condition with unsaturated water content during the 7 weeks at $25^{\circ}C$ in the different levels of CMS application. The results indicated that the total nitrogen content of soil was increased with increasing application rate of CMS and this trend was maintained up to 7 weeks. With CMS treatment content of $NH_4-N$ was gradually decreased. However, the content of $NO_3-N$ in the soil was gradually increased with incubation time due to the nitrification under the unsturated water condition. The CMS treatment increased the microbial populations such as bacteria, actinomycetes and fungi, which may be due to the availability of more nutrients such as amino acids, sugars and other minor elements from CMS. The pH of soil was found to be reduced by the addition of CMS, Whereas, electrical conduvtivity of soil was correspondingly increased with increasing application rate of CMS.

Lysine을 추출한 후 발생되는 농축당밀용액 (CMS)을 포장용수량의 60-70%인 수분불포화토양과 시용량을 달리하여 혼화처리한 후 $25^{\circ}C$의 항온조건에서 7주 동안 항온배양하면서 토양의 이화학성, 질소의 무기화 및 미생물상의 변화를 조사하였다. CMS를 경토중량의 0.3%에서 1.5%까지 혼화처리했을 때 T-N 함량은 7주 동안 일정한 양을 유지하였으며, CMS 시용량과 비례하여 증가하였다. $NH_4-N$는 시간경과에 따라 전체적으로 감소하였으며, 시용량이 적을수록 감소 폭은 커졌다. 반면, $NO_3-N$ 함량은 시간이 경과함에 따라 지속적으로 증가하여 수분불포화 조건에서 CMS를 처리하면 초기부터 질산화가 촉진되었으며 시용량이 적은 0.3%와 0.6% 처리구에서 $NO_3-N$의 증가폭이 컸다. CMS를 처리한 토양의 pH는 낮아지고 염농도 및 유기물 함량은 증가되었으나 유효인산의 함량에는 영향을 미치지 않았다. CMS 처리로 토양 미생물의 밀도는 무처리에 비하여 현저하게 증가하였으며, 특히 방선균은 배양 7주 동안 지속적인 밀도 증가를 나타내었고, 질소순환과 관계되는 미생물상의 밀도 변화도 무처리에 비하여 증가하는 경향이었다.

Keywords

References

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