Effect of Different Soil Managements on Physical Properties and Microbial Activities in Citrus Orchard Soil

초생재배가 감귤원 토양의 물리성과 미생물 활성에 미치는 영향

  • Joa , Jae-Ho (National Institute of Subtropical Agriculture, RDA) ;
  • Lee , Jong-Hee (Yeongnam Agricultural Research Institute, RDA) ;
  • Won , Hung-Yon (National Institute of Agricultural Science & Technology, RDA) ;
  • Han , Seung-Gap (National Institute of Subtropical Agriculture, RDA) ;
  • Lim , Han-Cheol (National Institute of Subtropical Agriculture, RDA)
  • Received : 2008.08.16
  • Accepted : 2008.10.02
  • Published : 2008.10.30

Abstract

This study was performed to investigate effect of different soil managements on physical properties and microbial activities in volcanic ash citrus orchard soil. Experiment plots had managed to control weeds on soil for 4 years with clean cultivation (CCM) used with herbicide, natural sod cultivation (NSCM), kentucky blue grass sod cultivation (KBG). Soil samples were taken on October, in both 1998 and 2000 from 3 experimental plots. In NSCM, Soil hardness was lower at 11.8 mm than in CCM. And water stable Aggregation coefficient(>0.5 mm) was high at 26.7% compared with CCM. Soil bulk density and porosity showed no significant among the treatments. Soil acid phosphatase was high in sod cultivation plots and the amount of microbial biomass C was about twice higher at $525.4mg\;kg^{-1}$ in KBG than in CCM. Conclusionally, Sod cultivation improved soil physical properties such as aggregation, hardness and increased microbial activities compared with clean cultivation in citrus orchard soil. Soil total PLFA, acid phosphatase, and microbial biomass C contents were investigated on May in nonvolcanic ash citrus soil. Soil samples were collected at 5 sites each; convention cultivation grown with herbicide, natural sod cultivation grown with 1/2 chemicals, organic cultivation. That sites have been managed for 5 years over. PLFA contents were two times higher at $112.2n\;mol\;g^{-1}$ in organic cultivation than in convention cultivation. According to the PLFA indicator, Gram negative bacteria and actinomycetes in organic cultivation were high compared with convention cultivation, which were at 15.1%, 6.6%, respectively. Soil microbial biomass C contents was about twice higher in organic cultivation than in convention cultivation. Soil acid phosphatase was high at 17.6% in organic cultivation compared with convention cultivation.

Keywords

Sod cultivation;Citrus;PLFA;Microbial biomass C;Acid phosphatase

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