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<p>A considerable proportion of applied nutrients are adsorbed by the calcite surface of calcareous soils, making them unavailable to plants. A combination of organic amendments and fertilizers can improve nutrient retention and mineralization, and also reduce greenhouse gas (GHG) emissions. A two-years field experiment was undertaken to investigate the impacts of inorganic fertilizer, biochar and silicon on nutrient uptake, growth, yield and post-harvest soil chemistry in calcareous soil using rice (<i>Oryza sativa</i> L.) as a test crop. The implication of each treatment on methane emissions was also investigated. The combination of NPK, biochar and silicon significantly improved rice growth, yield, P and Si uptake; and post-harvest soil nutrition. Biochar increased soil organic carbon content between 4.2 and 108.5% across the years. An increase from 2.4 to 6.1% was observed in the inorganic fertilizer treatments, 11.4–12.0% for the biochar treatments and 2.5–19.0% for ½NPK + biochar from 2020 to 2021. Maximum grain yield was achieved with the treatment ½NPK + biochar + 100&#xa0;kg Si ha<sup>− 1</sup> which was comparable to NPK + 100&#xa0;kg Si ha<sup>− 1</sup>. Also, the combination of ½NPK + biochar + 50&#xa0;kg Si reduced CH<sub>4</sub> emissions and produced a comparable yield to NPK + 50&#xa0;kg Si in both years. While further research is required to explore the effects of the length of time biochar is applied on reducing CH<sub>4</sub> emissions, this study suggests a basis for predicting the impact of biochar on the management of CH<sub>4</sub> emissions in calcareous soils.</p>

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Sustaining Productivity while Reducing Methane Emission in Calcareous Soils: Implications of Combining Inorganic Fertilizer and Biochar

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月23日

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  • Agbesi Kwadzo Keteku,
  • Isaac Kodzo Amegbor,
  • Stephen Yeboah,
  • Patricia Amankwaa-Yeboah,
  • Richard Dormatey,
  • Kennedy Agyeman,
  • Mavis Badu Brempong,
  • Ernest Baafi,
  • Maxwell Darko Asante,
  • Allen Oppong,
  • Samuel Aduse Poku,
  • Eric Owusu Danquah,
  • Felix Frimpong,
  • Philip Ghanney,
  • Sylvester Addy,
  • Elvis Agyei Obeng,
  • Franklin Bosompem

摘要

A considerable proportion of applied nutrients are adsorbed by the calcite surface of calcareous soils, making them unavailable to plants. A combination of organic amendments and fertilizers can improve nutrient retention and mineralization, and also reduce greenhouse gas (GHG) emissions. A two-years field experiment was undertaken to investigate the impacts of inorganic fertilizer, biochar and silicon on nutrient uptake, growth, yield and post-harvest soil chemistry in calcareous soil using rice (Oryza sativa L.) as a test crop. The implication of each treatment on methane emissions was also investigated. The combination of NPK, biochar and silicon significantly improved rice growth, yield, P and Si uptake; and post-harvest soil nutrition. Biochar increased soil organic carbon content between 4.2 and 108.5% across the years. An increase from 2.4 to 6.1% was observed in the inorganic fertilizer treatments, 11.4–12.0% for the biochar treatments and 2.5–19.0% for ½NPK + biochar from 2020 to 2021. Maximum grain yield was achieved with the treatment ½NPK + biochar + 100 kg Si ha− 1 which was comparable to NPK + 100 kg Si ha− 1. Also, the combination of ½NPK + biochar + 50 kg Si reduced CH4 emissions and produced a comparable yield to NPK + 50 kg Si in both years. While further research is required to explore the effects of the length of time biochar is applied on reducing CH4 emissions, this study suggests a basis for predicting the impact of biochar on the management of CH4 emissions in calcareous soils.