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Earthworm inoculation and straw return decrease the phosphorus adsorption capacity of soils in the Loess region,

Yanpei Li1, Jiao Wang2, Ming'an Shao3

  • 1State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, 712100, China; University of Chinese Academy of Sciences, Beijing, 100049, China.

Journal of Environmental Management
|March 25, 2022
PubMed
Summary

Adding earthworms and straw to soil in the Loess Plateau reduces phosphorus (P) adsorption and increases P availability for crops. This improves soil fertility and P utilization efficiency in agricultural systems.

Keywords:
Earthworm inoculationLoessPhosphorus adsorptionPhosphorus desorptionStraw return

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Area of Science:

  • Soil Science
  • Agricultural Science
  • Environmental Science

Background:

  • The Loess Plateau is vital for China's maize production, necessitating optimized fertilization strategies.
  • Understanding soil phosphorus (P) behavior is crucial for efficient agriculture in this region.
  • While fertilization is well-studied, the impacts of straw return and soil fauna on P dynamics require further investigation.

Purpose of the Study:

  • To investigate the effects of earthworms and straw return on soil P adsorption-desorption characteristics in the Loess region.
  • To evaluate the combined and individual effects of earthworm inoculation and straw return on soil P dynamics.
  • To provide a scientific basis for enhancing P utilization efficiency in agricultural systems.

Main Methods:

  • A field plot experiment using a completely randomized design was conducted.
  • Treatments included control (no earthworms, no straw), earthworms only, straw only, and both earthworms and straw.
  • The Langmuir model was used to interpret P adsorption data, and redundancy analysis assessed influencing factors.

Main Results:

  • Combined earthworm and straw treatments significantly reduced maximal P adsorption, P adsorption affinity, and buffer capacity.
  • Readily desorbable P, standard P requirement, and P saturation degree increased with earthworm and straw treatments.
  • Soil organic carbon, total P, Olsen P, free Fe2O3, CaCO3, and specific surface area were significantly increased.

Conclusions:

  • Combining earthworm inoculation with straw return effectively reduces soil P adsorption and enhances P desorption.
  • These practices increase available P content, improving soil fertility and P utilization efficiency.
  • The findings offer a scientific foundation for sustainable agricultural management in the Loess Plateau.