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Improving Crop Yield and Nutrient Use Efficiency via Biofertilization-A Global Meta-analysis.

Lukas Schütz1,2, Andreas Gattinger2, Matthias Meier3

  • 1Department of Environmental Sciences-Botany, University of Basel, Basel, Switzerland.

Frontiers in Plant Science
|January 30, 2018
PubMed
Summary

Microbial inoculants, or biofertilizers, boost crop yields and nutrient use efficiency, especially in dry climates. Their effectiveness varies with soil phosphorus levels and microbial traits like nitrogen fixation.

Keywords:
PGPRagricultural productivityarbuscular mycorrhizal fungibiofertilizermeta-analysismicrobial inoculantsnitrogen use efficiencyphosphorus use efficiency

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Area of Science:

  • Agricultural Science
  • Soil Microbiology
  • Sustainable Agriculture

Background:

  • Declining phosphorus stocks and inefficient nitrogen use necessitate sustainable farming solutions.
  • Microbial inoculants (biofertilizers) offer a promising approach by enhancing nutrient availability and uptake.
  • Existing knowledge on specific biofertilizer taxa is extensive, but a global, quantitative assessment of diverse traits is lacking.

Purpose of the Study:

  • To quantitatively assess the global performance of biofertilizers with varying traits (e.g., phosphorus solubilization, nitrogen fixation).
  • To evaluate the impact of biofertilizers on crop yield, nitrogen (N), and phosphorus (P) use efficiency.
  • To provide guidance for the selection and application of biofertilizers.

Main Methods:

  • A meta-analysis was conducted using data from 171 peer-reviewed publications.
  • The study quantified yield increases and nutrient use efficiencies attributed to biofertilizer application.
  • Meta-regression analyses explored the influence of climate, soil properties, and biofertilizer traits on performance.

Main Results:

  • Biofertilizers showed superior performance in dry climates (yield response +20.0%) compared to tropical, oceanic, and continental climates.
  • Efficacy increased with higher soil phosphorus levels, with arbuscular mycorrhizal fungi (AMF) showing greater benefits than P-solubilizers and N-fixers.
  • AMF inoculation success was higher in soils with low organic matter and neutral pH.

Conclusions:

  • Biofertilizer application significantly enhances crop yield and nutrient use efficiency globally.
  • Climate and soil conditions, particularly phosphorus availability, play a crucial role in biofertilizer efficacy.
  • Understanding the interplay between biofertilizer traits and environmental factors is key for optimizing sustainable agricultural practices.