PHOSPHORUS AVAILABILITY IN SOIL INCUBATED WITH BIOCHAR: ADSORPTION STUDY

Josely Dantas Fernandes; Lúcia Helena Garófalo Chaves; Edilma Rodrigues Bento Dantas; Gilvanise Alves Tito; Hugo Orlando Carvalho Guerra

doi:10.1590/1983-21252022v35n121rc

Autores

Josely Dantas Fernandes Department of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0002-1297-6962
Lúcia Helena Garófalo Chaves Department of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0002-9905-2315
Edilma Rodrigues Bento Dantas Department of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0001-9663-1787
Gilvanise Alves Tito Department of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0001-7816-1830
Hugo Orlando Carvalho Guerra Department of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0001-5468-5509

DOI:

https://doi.org/10.1590/1983-21252022v35n121rc

Palavras-chave:

Isotermas de adsorção. Cama de aviário. Cinética. Propriedades físico-quimicas.

Resumo

Considerando as perdas de fósforo (P) no solo pelo processo de adsorção e que o uso do biocarvão parece promissor do ponto de vista agrícola, objetivou-se com este estudo avaliar o processo de adsorção de P pelo solo Argissolo incubado com diferentes doses de biocarvão através de estudo cinético e isotérmico. O experimento foi realizado com biocarvão de cama de aviário pirolisado a 350 °C. O Argissolo foi incubado com doses crescentes de biocarvão, de 0,0 a 61,95 t ha^-1. Após 60 dias, foram avaliadas a taxa de adsorção de fósforo, e cinética e isotermas de adsorção. Os resultados mostraram que o solo apresentou a maior capacidade de adsorção de fósforo (1,105 mg g^-1). O biocarvão não foi um bom adsorvente de P; independente das doses aplicadas, liberou P para a solução de equilíbrio. O modelo de Langmuir foi o melhor para descrever a adsorção de P. A cinética de adsorção de P se ajustou bem ao modelo de pseudo-segunda ordem, mostrando que a adsorção é controlada quimicamente. Esses resultados sugerem que o biocarvão pode aumentar a disponibilidade de P no solo, limitando a adsorção, portanto, pode ser usado como fertilizante e/ou condicionador de solo.

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