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Plant and Soil

, Volume 328, Issue 1–2, pp 203–215 | Cite as

Effects of fertilizer and spatial heterogeneity in soil pH on microbial biomass indices in a long-term field trial of organic agriculture

  • Stefanie Heinze
  • Joachim Raupp
  • Rainer Georg Joergensen
Regular Article

Abstract

In the Darmstadt long-term fertilization trial, the application of composted cattle farmyard manure without (CM) and with (CMBD) biodynamic preparations was compared to mineral fertilization with straw return (MIN). The present study was conducted to investigate the effects of spatial variability, especially of soil pH in these three treatments, on soil organic matter and soil microbial biomass (C, N, P, S), activity (basal CO2 production and O2 consumption), and fungal colonization (ergosterol). Soil pH was significantly lower in the MIN treatments than in the organic fertilizer treatments. In the MIN treatments, the contents of soil organic C and total N were also significantly lower (13% and 16%, respectively) than those of the organic fertilizer treatments. In addition, the total S content increased significantly in the order MIN < CM < CMBD. The microbial biomass C content was significantly lower (9%) in the MIN treatments than in the organic fertilizer treatments. Microbial biomass N and biomass P followed microbial biomass C, with a mean C/N ratio of 7.9 and a mean C/P ratio of 23. Neither the microbial biomass C to soil organic C ratio, the metabolic quotient qCO2, nor the respiratory quotient (mol CO2/mol O2) revealed any clear differences between the MIN and organic fertilizer treatments. The mean microbial biomass S content was 50% and the mean ergosterol content was 40% higher in the MIN treatments compared to the organic fertilizer treatments. The increased presence of saprotrophic fungi in the MIN treatments was indicated by significantly increased ratios of ergosterol-to-microbial biomass C and the microbial biomass C/S ratio. Our results showed that complex interactions between the effects of fertilizer treatments and natural heterogeneity of soil pH existed for the majority of microbial biomass and activity indices.

Keywords

Soil organic matter Microbial biomass Ergosterol Basal respiration Respiratory quotient Farmyard manure 

Notes

Acknowledgements

The technical assistance of Gabriele Dormann is highly appreciated. This project was supported by a grant of the Research Training Group 1397 “Regulation of soil organic matter and nutrient turnover in organic agriculture” of the German Research Foundation (DFG).

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Stefanie Heinze
    • 1
  • Joachim Raupp
    • 2
  • Rainer Georg Joergensen
    • 1
  1. 1.Department of Soil Biology and Plant NutritionUniversity of KasselWitzenhausenGermany
  2. 2.Institute for Biodynamic ResearchDarmstadtGermany

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