Medium-term effects of a single application of mustard residues on soil microbiota and C content of vertisols |
| |
| Authors: | Belete Lulu H Insam |
| |
| Institution: | (1) Institute of Microbiology, University of Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria e-mail: heribert.insam@uibk.ac.at Tel.: +43-512-5076009 Fax: +43-512-5072928, AT;(2) Jimma College of Agriculture, P.O. Box 307, Jimma, Ethiopia, ET |
| |
| Abstract: | A study of the effects of different qualities (fresh and composted) and rates (equivalent to 120, 240, and 360 kg N ha–1) of mustard meal application on wheat yields on humid tropical vertisol was started in 1990 at Ginchi Research Station in
Ethiopia. After continuous wheat cropping for 7 years and without any further fertilisation, soil microbial parameters (basal
respiration, microbial biomass-C and N, organic-C, and ecophysiological quotients) were studied during one growth period.
After 7 years of application, mustard meal still exerted a significant positive effect on microbial biomass, basal respiration,
organic-C, Cmic : Nmic ratio, and metabolic quotient (qCO2). Organic-C, qCO2 and Cmic : Nmic ratios were higher for the compost-amended plots than plots amended with fresh mustard meal. Basal respiration, Cmic, and Cmic : Nmic ratio showed a clear seasonality, but only in manured plots. The data indicate shifts in microbial community structure (from
bacteria to fungi and from r to K strategists) and suggest positive medium-term effects of mustard meal on humid tropical
vertisol biological qualities.
Received: 25 May 1999 |
| |
| Keywords: | Mustard meal Organic-C Vertisol Metabolic quotient Microbial community |
| 本文献已被 SpringerLink 等数据库收录！ |
|
