African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6574

Full Length Research Paper

Evaluation of soil biological properties of 9- and 15-year-old stands in the oil palm plantation in Perak, Malaysia

Daljit Singh Karam1, A. Arifin1,2*, O. Radziah3,4, J. Shamshuddin3, Hazandy Abdul-Hamid1,2, Nik M. Majid1, I. Zahari5, Nor Halizah Ab. Halim5 and Cheng Kah Yen1
1Department of Forest Production, Faculty of Forestry, Institute of Tropical Forestry and Forest Products,  Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. 2Laboratory of Sustainable Bioresource Management, Institute of Tropical Forestry and Forest Products,  Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. 3Department of Land Management, Faculty of Agriculture,Universiti Putra Malaysia, 43400 UPM Serdang,  Selangor, Malaysia. 4Laboratory of Food Crops and Floriculture, Institute of Tropical Agriculture, Universiti Putra Malaysia,  43400 UPM Serdang, Selangor, Malaysia. 5Forestry Department Peninsular Malaysia, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
Email: [email protected], [email protected]

  •  Accepted: 26 July 2011
  •  Published: 01 August 2013

Abstract

Opening land for oil palm cultivation provokes many debates around the world regarding on the fate of biodiversity. A study was conducted to evaluate and compare soil biological properties of 9-year-old (P1) and 15-year-old (P2) stands of an oil palm plantation in Bikam, Perak, Malaysia. Composite samples were collected at depths of 0-15 cm (topsoil) and 15-30 cm (subsoil) located within six subplots (20 m × 20 m). The microbial population count was estimated using a spread-plate technique, and the Fluorescein diacetate (FDA) hydrolysis assay was used to measure microbial enzymatic activity. A rapid ethanol-free chloroform fumigation extraction technique was used for microbial biomass extraction, and the extracts were respectively analyzed by wet dichromate oxidation and Kjeldahl digestion for biomass carbon (C) and nitrogen (N). At the 0-15 cm depth, the microbial biomass C and N contents in the soils from both plots were significantly different (P<0.05). At the 15-30 cm depth, only microbial enzymatic activity was significantly different between plots. Although the addition of fertilizers to the soil is believed to be a predisposing factor, no significant differences in P1 and P2 plots for the biomass C and N in soils at the 15-30 cm depth were observed. Variations in the MBC/MBN ratio in soils of the P1 and P2 plots indicate that changes occurring in the soil microbial composition are due to the availability of soil organic substrates and N. Thus establishment of an oil palm plantation does contribute to changes in soil biological properties.

 

Key words: Oil palm, different ages, microbial population, enzymatic activity, biomass C and N, rapid chloroform-fumigation extraction technique.