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Novel Slow-Release NPK Biochar-Based Fertilizers with Acidulated Apatite: Evaluation of the Fertilization Value in a Short-Term Experiment

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Journal of Soil Science and Plant Nutrition Aims and scope Submit manuscript

Abstract

Purpose

Compared with mineral fertilizers, the use efficiency of nitrogen (N), phosphorus (P), and potassium (K) from organomineral matrices increases as biochar is mixed with acidulated apatite to produce slow-release NPK-biochar-based fertilizers (BBFs). The BBFs reduce P losses while improving plant nutrition in Oxisols. Thus, the aim of this study was to synthetize and evaluate the effects of slow-release BBFs produced by mixing coffee waste-derived biochar with acidulated apatite.

Methods

The agronomic efficiency of BBFs was evaluated through the cultivation of maize in greenhouse conditions. The availability of NPK in whole soil and solution and the kinetics of P released by fertilizers in water and citric acid leachates were evaluated as well.

Results

Compared with mineral fertilizers, N and K supplied by BBFs did not improve the nutrition of maize plants. Triple superphosphate (TSP) released nearly all the total P, while the BBFs released less than 10% of the P released by the TSP in the first 24 h. Biochar based-fertilizers, depending on the synthesis route adopted, produced a greater or similar maize biomass. The acquisition of P from BBFs was greater than that of NPK supplied via mineral fertilizers. Thus, BBFs can slow the release of P in water leachates and, simultaneously, release high levels of P in citric acid leachates.

Conclusions

The BBFs formulated with coffee husk-derived biochar and acidulated apatite are a sustainable and efficient approach to producing NPK sources with higher agronomic effectiveness than soluble mineral fertilizers. The BBFs improved the nutritional status and growth of maize and the residual available soil P content in the Oxisols as well (Ferralsols).

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Data Availability

All data generated or analysed during this study are included in this published article [and its supplementary information files]. However, the raw dataset can be requested from the corresponding author on reasonable request.

References

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Funding

This study received grants from the Coordination for the Improvement of Higher Education Personnel (CAPES) (CAPES-PROEX/AUXPE 593/2018), National Council for Scientific and Technological Development (CNPq) (303899/2015-8 and 307447/2019-7 grants), and the Foundation for Research of the State of Minas Gerais (FAPEMIG).

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Authors and Affiliations

Authors

Contributions

Conceptualization: EGM and CAS; methodology: EGM and CAS; software: EGM; validation: EGM and CAS; formal analysis: EGM; investigation: EGM; resources: CAS; data curation: EGM; writing—original draft: EGM and CAS; writing—review and editing: EGM and CAS; visualization: EGM; supervision: CAS; project administration: CAS; funding acquisition: CAS.

Corresponding author

Correspondence to Everton Geraldo de Morais.

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Conflict of Interest

The authors declare no competing interests.

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We confirm that the manuscript has been read and approved by all named authors and that there are no other persons who satisfied the criteria for authorship but are not listed. We further confirm that the order of authors listed in the manuscript has been approved by all of us.

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Supplementary Information

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de Morais, E.G., Silva, C.A. Novel Slow-Release NPK Biochar-Based Fertilizers with Acidulated Apatite: Evaluation of the Fertilization Value in a Short-Term Experiment. J Soil Sci Plant Nutr 23, 4937–4954 (2023). https://doi.org/10.1007/s42729-023-01494-y

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  • DOI: https://doi.org/10.1007/s42729-023-01494-y

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