Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/42289
Título: Enhancing cation exchange capacity of weathered soils using biochar: feedstock, pyrolysis conditions and addition rate
Palavras-chave: Thermal stability
Aging
High-ash biochar
Biochar aromatic character
Chicken manure
Coffee husk
Biochar agronomic rate
Estabilidade térmica
Esterco de galinha
Casca de café
Biocarvão - Eficiência agronômica
Solos - Fertilizantes
Data do documento: Jun-2020
Editor: MDPI
Citação: DOMINGUES, R. R. et al. Enhancing cation exchange capacity of weathered soils using biochar: feedstock, pyrolysis conditions and addition rate. Agronomy, [S. I.], v. 10, n. 6, 2020. Doi: 10.3390/agronomy10060824
Resumo: The addition of alkaline and high-cation exchange capacity (CEC) biochars is a suitable strategy to increase the CEC of weathered soils. The aim of this study was to evaluate the effect of biochar from different feedstocks and pyrolysis temperatures on the CEC of two contrasting Oxisols. Biochars produced from chicken manure (CM), eucalyptus sawdust (ES), coffee husk (CH) and sugarcane bagasse (SB),plus a control (without biochar), at 350, 450, and 750 °C were mixed with the soils at 2; 5; 10 and 20% (w/w) and incubated for 9 months. Feedstock, pyrolysis temperature and addition rate of biochar were key factors controlling the alteration of soil CEC. The CH biochar pyrolyzed at 350 °C was the most effective matrix at increasing soil CEC. In a rate-dependent way, ES and SB biochars increased C contents of both soils without improving soil CEC. The efficiency of high-ash biochars in enhancing soil CEC in both Oxisols was limited by the alkalization caused by high rates of CH and CM biochars. The increase in CEC is soil-dependent and modulated by high-ash biochar CEC and application rate, as well as by the original soil CEC.
URI: http://repositorio.ufla.br/jspui/handle/1/42289
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