Impact of long-term fertilization practice on soil structure evolution

Muhammad Naveed, Per Moldrup, Hans JÖrg Vogel, Mathieu Lamandé, Dorthe Wildenschild, Markus Tuller, Lis Wollesen de Jonge

Research output: Contribution to journalArticlepeer-review

96 Scopus citations


The study characterized soil structure development and evolution in six plots that were amended with varying amounts of animal manure (AM) and NPK fertilizer over a period of 106years in a long-term fertilization experiment in Bad Lauchstädt, Germany. Two intact soil cores (10-cm diameter and 8-cm tall) and bulk soil samples were extracted from a depth between 5 and 15-cm from each plot. Soil properties including texture, organic carbon, soil-water characteristic, air permeability and diffusivity were measured and analyzed along with X-ray computed tomography (CT) data. Long-term applications of AM and NPK had a major impact on soil organic carbon content which increased from 0.015kgkg-1 (unfertilized plot) to 0.024kgkg-1 (well fertilized plot, 30Tha-12y-1AM with NPK). Total porosity linearly followed the organic carbon gradient, increasing from 0.36 to 0.43m3m-3. The water holding capacity of the soil was considerably increased with the increase of AM and NPK applications. Gas diffusivity and air permeability measurements clearly indicated that the level of soil aeration improved with increasing AM and NPK fertilizer amount. The three-dimensional X-ray CT visualizations revealed higher macroporosity and biological (earthworm) activity in the well fertilized areas when compared to plots without or only a small amount of fertilizer applied. A combined evaluation of the soil water characteristic, gas transport and X-ray CT results suggested that pore size distributions widened, and pore connectivity was significantly improved with increasing fertilizer amount. Furthermore, the soils fertilized with both AM and NPK showed a more aggregated structure than soils amended with AM only.

Original languageEnglish (US)
Pages (from-to)181-189
Number of pages9
StatePublished - Apr 2014


  • Air permeability
  • Animal manure
  • Gas diffusivity
  • NPK fertilizers
  • Soil-water characteristic
  • X-ray computed tomography

ASJC Scopus subject areas

  • Soil Science


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