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Related Experiment Video

Updated: Oct 30, 2025

Isolation and Analysis of Microbial Communities in Soil, Rhizosphere, and Roots in Perennial Grass Experiments
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Soil Microbial Indicators within Rotations and Tillage Systems.

Gevan D Behnke1, Nakian Kim1, Maria C Zabaloy2

  • 1Department of Crop Sciences, University of Illinois, Urbana, IL 61801, USA.

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|July 2, 2021
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Summary

Long-term crop rotation and tillage significantly alter soil microbial communities. Continuous corn and no-till practices impact soil pH, organic matter, and nitrogen-cycling bacteria.

Keywords:
archaeabacteriafungimaizemetagenomicsmicrobial N cyclemonoculturesnitrificationno tillagesoybean

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Area of Science:

  • Agricultural Science
  • Soil Microbiology
  • Metagenomics

Background:

  • Agricultural practices like crop rotation and tillage profoundly influence soil health.
  • Understanding long-term impacts on soil microbial communities is crucial for sustainable agriculture.
  • Field-scale studies on microbial indicators under sustained management are limited.

Purpose of the Study:

  • To investigate the long-term effects of crop rotation (continuous corn, continuous soybean, corn-soybean rotations) and tillage (no-till, chisel tillage) on soil microbial community composition.
  • To identify microbial indicator species sensitive to specific soil properties altered by these management practices.
  • To characterize the influence of 20 years of agricultural management on soil pH, soil organic matter (SOM), and microbial taxa.

Main Methods:

  • Field-scale experiment with established crop rotations and tillage systems over 20 years.
  • Metagenomic analysis to characterize bacterial, fungal, and archaeal community composition.
  • Measurement of key soil properties including pH and soil organic matter (SOM).

Main Results:

  • Crop rotation and tillage significantly altered soil properties, including pH and SOM.
  • Continuous corn (CCC) resulted in lower pH and higher SOM compared to continuous soybean (SSS).
  • Distinct bacterial groups were identified as indicators, associated with SOM levels, pH preferences, and nitrogen cycling.

Conclusions:

  • Long-term agricultural management practices demonstrably shape soil microbial communities.
  • Specific crop rotations and tillage methods select for microbial indicator species with differing ecological niches.
  • Understanding these relationships is vital for managing soil health and nutrient cycling in agricultural systems.