Analysis of Nutrient Cycling Structure of a Korean Beef Cattle Farm Combined with Cropping as Affected by Bedding Material Types

깔개물질의 종류에 따른 한우-경종 결합 농가의 양분순환 구조 분석

  • Lim, Sang-Sun (Department of Biosystems & Agricultural Engineering, Institute of Agricultural Science & Technology, Chonnam National University) ;
  • Kwak, Jin-Hyeob (Department of Biosystems & Agricultural Engineering, Institute of Agricultural Science & Technology, Chonnam National University) ;
  • Park, Hyun-Jung (Department of Biosystems & Agricultural Engineering, Institute of Agricultural Science & Technology, Chonnam National University) ;
  • Lee, Sun-Il (Department of Biosystems & Agricultural Engineering, Institute of Agricultural Science & Technology, Chonnam National University) ;
  • Lee, Dong-Suk (Department of Biosystems & Agricultural Engineering, Institute of Agricultural Science & Technology, Chonnam National University) ;
  • Kim, Yong-Soon (Jeonnam Agricultural Research & Extension) ;
  • Yun, Bong-Ki (Jeonnam Agricultural Research & Extension) ;
  • Kim, Sun-Woo (Youngam Agricultural Technology & Extension Center) ;
  • Choi, Woo-Jung (Department of Biosystems & Agricultural Engineering, Institute of Agricultural Science & Technology, Chonnam National University)
  • 임상선 (전남대학교 농업과학기술연구소 생물산업공학과) ;
  • 곽진협 (전남대학교 농업과학기술연구소 생물산업공학과) ;
  • 박현정 (전남대학교 농업과학기술연구소 생물산업공학과) ;
  • 이선일 (전남대학교 농업과학기술연구소 생물산업공학과) ;
  • 이동석 (전남대학교 농업과학기술연구소 생물산업공학과) ;
  • 김용순 (전남농업기술원) ;
  • 윤봉기 (전남농업기술원) ;
  • 김선우 (영암농업기술센터) ;
  • 최우정 (전남대학교 농업과학기술연구소 생물산업공학과)
  • Received : 2008.08.20
  • Accepted : 2008.10.05
  • Published : 2008.10.30

Abstract

In this study, we analyzed nutrient cycling structure of a small farm (cattle of 100 heads and arable lands of 2.5 ha) in Jeonnam province to investigate the effects of nutrients input by the addition of bedding materials (sawdust and rice hull) and nutrients loss before the application to the soils (the period during manure storage in the feedlot and composting process) on nutrient cycling structure. Sawdust and rice hull added as bedding materials increased N by 1.6% and 14.2% and $P_2O_5$ by 3.1% and 27.4%, respectively, relative to the amount of nutrients produced by excretion. This result suggests that the addition of nutrients via bedding materials should be considered for better estimation of nutrient balance. The most significant characteristics of the nutrient cycling structure was loss of mass and nutrients during the storage (21 days) and composting period (90 days). During this period, 78.4% of N and 9.5% of $P_2O_5$ was lost from sawdust compost; meanwhile, the percentages of loss for rice hull compost were 81.6% and 10.3%, respectively. A lower percentage of nutrients loss in sawdust compost than that in rice hull compost was attributed to the relatively slow decomposition rate of organic materials in the sawdust compost which has higher C/N ratio and lignin contents. Therefore, it was concluded that estimation of nutrient balance should be conducted based on nutrient contents in the final compost being applied to the lands rather than the amount of nutrients contained in the livestock excretion. In addition, the effects of bedding materials on nutrient losses should be also taken into account.

Keywords

Bedding material;Composting;Nitrogen;Nutrient balance;Phosphorus

Acknowledgement

Supported by : 농림수산식품부

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