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How Does the Waterlogging Regime Affect Crop Yield? A Global Meta-Analysis.

Li-Xin Tian1, Yu-Chuan Zhang1, Peng-Liang Chen1

  • 1State Key Laboratory of Crop Stress Biology in Arid Areas/Shaanxi Research Station of Crop Gene Resources and Germplasm Enhancement, Ministry of Agriculture, College of Agronomy, Northwest A & F University, Yangling, China.

Frontiers in Plant Science
|March 8, 2021
PubMed
Summary

Waterlogging significantly reduces global crop yield by an average of 32.9%. This yield loss is linked to decreased grain weight, biomass, plant height, photosynthetic rate, and leaf area index, impacting various crop types.

Keywords:
crop typegrain yieldgrowth stagemeta-analysiswaterlogging duration

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Area of Science:

  • Agricultural Science
  • Agronomy
  • Plant Physiology

Background:

  • Waterlogging is a major abiotic stress limiting global crop production.
  • Understanding its impact on yield is crucial for food security.

Purpose of the Study:

  • To conduct a meta-analysis evaluating the global impact of waterlogging on crop yield.
  • To identify key factors influencing yield reduction due to waterlogging.

Main Methods:

  • Meta-analysis of 2,419 comparisons from 115 studies.
  • Quantified changes in crop yield and related physiological parameters.

Main Results:

  • Waterlogging decreased crop yield by 32.9% on average.
  • Reductions observed in 1,000-grain weight (13.67%), biomass (28.89%), plant height (10.68%), net photosynthetic rate (39.04%), and leaf area index (22.89%).
  • Yield reduction varied by crop type (e.g., wheat 25.53%, cotton 59.95%) and growth stage (reproductive: 41.90%, vegetative: 34.75%).

Conclusions:

  • Waterlogging significantly reduces crop yield globally.
  • Crop type, growth stage, and waterlogging duration are key factors influencing yield loss.