African Journal of
Microbiology Research

  • Abbreviation: Afr. J. Microbiol. Res.
  • Language: English
  • ISSN: 1996-0808
  • DOI: 10.5897/AJMR
  • Start Year: 2007
  • Published Articles: 5177

Full Length Research Paper

Influence of straw degrading microbial compound on wheat straw decomposition and soil biological properties

  Ogunniyi Jumoke Esther, Tian Xiao Hong* and Guo Chun Hui
College of Natural Resources and Environment, Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling 712100, China.
Email: [email protected] or [email protected]

  •  Accepted: 03 July 2013
  •  Published: 12 July 2013

Abstract

 

The main challenge to successful use of wheat straw as soil amendment is its slow decomposition rate as compared to other crop residues. In order to solve this problem and increase farmers’ acceptability, inoculation of straw amended soil with microbial compounds to hasten decomposition is being promoted in China. In this experiment, the effect of three types of industrially produced composite microbial system (Renyuan shengwu (RW), Taigubio (TB) and China green health (GH)) were investigated under two straw placement options (incorporation I and layered L) on wheat straw decomposition and soil biological properties. The result indicates significant differences for all the parameters measured at p ≤ 0.05. RW had highest total CO2 emission during the incubation period (61 days). There was a correlation between total CO2 emission and cellulase activity (R= 0.81) and dehydrogenase activity (R= -0.66). Placement option had effect on soil total organic carbon (TOC), microbial biomass carbon (MBC), fungi, actinomycetes and bacteria population, and cellulase activity. Both inoculation and straw returning to the soil increased TOC, micro flora and cellulase activity. The results show that direct inoculation of straw amended soil could improve straw decomposition rate and soil biological properties if suitable microbial strains are used.

 

Key words: Cellulase, dehydrogenase, composite microbial compound, wheat straw, straw placement.