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Temperature Effects on Properties of Rice Husk Biochar and Calcinated Burkina Phosphate Rock

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  • Vincent K. Avornyo

    (Department of Soil Science, University for Development Studies, Tamale P.O. Box TL 1882, Ghana
    This paper is a part of the PhD Thesis of Vincent K. Avornyo, presented at Iowa State University (USA).)

  • Andrew Manu

    (Department of Agronomy, Iowa State University, Ames, IA 50011-1051, USA)

  • David A. Laird

    (Department of Agronomy, Iowa State University, Ames, IA 50011-1051, USA)

  • Michael L. Thompson

    (Department of Agronomy, Iowa State University, Ames, IA 50011-1051, USA)

Abstract

Rice husk biochar (RHB) and phosphate rock (PR) are locally accessible resources that poor farmers in Sub-Saharan Africa (SSA) can utilize to increase rice productivity. However, biochars are variable depending on feedstock, pyrolysis temperature, and duration. Phosphate rocks from SSA are of low solubility. The goal of this study was to determine whether pyrolysis of rice husk (RH), calcination of PR, and the calcination/pyrolysis of a RHB-PR mixture at 300 °C, 500 °C, and 700 °C can increase formic acid (FA)- extractable phosphorous (P). The properties of these RHBs were compared to the properties of RHB produced through a simple farmer-friendly pyrolysis technique termed “Kun-tan”. Properties of calcinated PR were also compared to the raw PR. Quartz formed from amorphous SiO 2 during RH pyrolysis and was the dominant mineral phase in the biochars, irrespective of the pyrolysis temperature. Formic acid-extractable P content, pH, and ash content of the biochars increased with increasing pyrolysis temperature. At 700 °C, FA-extractable P content of the RHB was 219% more than the feedstock. Hydroxyapatite and quartz were the dominant minerals in the PR irrespective of calcination temperature, indicating that hydroxyapatite and quartz were stable to at least 700 °C. Rather, calcination decreased the FA-extractable P content of the PR.

Suggested Citation

  • Vincent K. Avornyo & Andrew Manu & David A. Laird & Michael L. Thompson, 2021. "Temperature Effects on Properties of Rice Husk Biochar and Calcinated Burkina Phosphate Rock," Agriculture, MDPI, vol. 11(5), pages 1-13, May.
    • Handle: RePEc:gam:jagris:v:11:y:2021:i:5:p:432-:d:551584
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    References listed on IDEAS

    as
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    2. Ragasa, Catherine & Dankyi, Awere & Acheampong, Patricia & Wiredu, Alexander Nimo & Chapoto, Antony & Asamoah, Marian & Tripp, Robert, 2013. "Patterns of adoption of improved rice technologies in Ghana:," GSSP working papers 35, International Food Policy Research Institute (IFPRI).
    3. Michael Morris & Valerie A. Kelly & Ron J. Kopicki & Derek Byerlee, 2007. "Fertilizer Use in African Agriculture : Lessons Learned and Good Practice Guidelines," World Bank Publications - Books, The World Bank Group, number 6650, December.
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