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[Biochar addition improves soil phosphorus availability: A meta-analysis].

Ya-Nan Zhan1, Zhi Wang1, Ya-Li Meng1

  • 1Ministry of Agriculture and Rural Affairs Key Laboratory of Crop Physio-logy, Ecology and Production Management, Nanjing Agricultural University, Nanjing 210095, China.

Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|June 13, 2020
PubMed
Summary
This summary is machine-generated.

Biochar significantly boosts soil available phosphorus (P) by 57.6%, enhancing crop P uptake. This meta-analysis confirms biochar

Keywords:
biocharmeta analysisplant phosphorus concentrationsoil available phosphorussoil phosphatase

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Area of Science:

  • Agricultural Science
  • Soil Science
  • Environmental Science

Background:

  • Soil phosphorus (P) availability is crucial for crop yield and fertility.
  • Limited quantitative data exists on biochar's impact on soil P.
  • Biochar is recognized for its potential to improve soil properties.

Purpose of the Study:

  • To quantitatively assess the effect of biochar addition on soil P availability.
  • To evaluate biochar's influence on crop P utilization and concentration.
  • To analyze the impact of biochar on soil enzymes involved in the P cycle.

Main Methods:

  • A meta-analysis was conducted using 507 data points from 95 eligible studies.
  • Data encompassed various biochar properties, soil characteristics, and fertilizer applications.
  • Statistical analysis was performed to determine response ratios and significance.

Main Results:

  • Biochar addition significantly increased soil available P by 57.6% across diverse conditions.
  • Crop P concentration increased by an average of 30.6%, indicating enhanced P utilization.
  • Specific biochar types (e.g., from livestock manure, low-temperature pyrolysis) and soil conditions (sandy, loamy) showed greater P improvement.
  • Alkaline phosphatase activity increased by 2.8%, while acid phosphatase decreased by 17.8%.

Conclusions:

  • Biochar addition is a highly effective strategy for improving soil P availability and crop P uptake.
  • The primary mechanism for increased P availability appears to be the inherent P content in biochar.
  • Biochar's positive effects on soil P are influenced by its characteristics and soil type, with minor impacts on phosphatase activity.