Spectroscopic Investigation on the Effects of Biochar and Soluble Phosphorus on Grass Clipping Vermicomposting

Etelvino Henrique Novotny, Fabiano de Carvalho Balieiro, Ruben Auccaise, Vinícius de Melo Benites and Heitor Luiz da Costa Coutinho
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Etelvino Henrique Novotny: Embrapa Solos, Rua Jardim Botânico, 1024, Rio de Janeiro 22460-000, Brazil
Fabiano de Carvalho Balieiro: Embrapa Solos, Rua Jardim Botânico, 1024, Rio de Janeiro 22460-000, Brazil
Ruben Auccaise: Departamento de Física, Universidade Estadual de Ponta Grossa, Av. General Carlos Cavalcanti 4748, Ponta Grossa 84030-900, Brazil
Vinícius de Melo Benites: Embrapa Solos, Rua Jardim Botânico, 1024, Rio de Janeiro 22460-000, Brazil
Heitor Luiz da Costa Coutinho: Embrapa Solos, Rua Jardim Botânico, 1024, Rio de Janeiro 22460-000, Brazil

Agriculture, 2022, vol. 12, issue 7, 1-12

Abstract: Seeking to evaluate the hypothesis that biochar optimises the composting and vermicomposting processes as well as their product quality, we carried out field and greenhouse experiments. Four grass clipping composting treatments (only grass, grass + single superphosphate (SSP), grass + biochar and grass + SSP + biochar) were evaluated. At the end of the maturation period (150 days), the composts were submitted to vermicomposting (Eisenia fetida earthworm) for an additional 90 days. Ordinary fine charcoal was selected due to its low cost (a by-product of charcoal production) and great availability; this is important since the obtained product presents low commercial value. A greater maturity of the organic matter (humification) was observed in the vermicompost treatments compared with the compost-only treatments. The addition of phosphate significantly reduced the pH (from 6.7 to 4.8), doubled the electrical conductivity and inhibited biological activity, resulting in less than 2% of the number of earthworms found in the treatment without phosphate. The addition of soluble phosphate inhibited the humification process, resulting in a less-stable compound with the preservation of labile structures, primarily cellulose. The P species found corroborate these findings because the pyrophosphate conversion from SSP in the absence of biochar may explain the strong acidification and increased electric conductivity. Biochar appears to prevent this conversion, thus mitigating the deleterious effects of SSP and favouring the formation of organic P species from SSP (78.5% of P in organic form with biochar compared to only 12.8% in the treatments without biochar). In short, biochar decreases pyrophosphate formation from SSP, avoiding acidification and salinity; therefore, biochar improves the whole composting and vermicomposting process and product quality. Vermicompost with SSP and biochar should be tested as a soil conditioner on account of its greater proportion of stabilized C and organic P.

Keywords: 13 C nuclear magnetic resonance; 31 P nuclear magnetic resonance; charcoal; Eisenia fetida; pyrogenic carbon (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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