Phosphorus adsorption after the incubation of clay soil with different doses of biochar

Résumé fourni par la source

ABSTRACT Biochar is formed by the thermal treatment of biomass in a low-oxygen atmosphere through pyrolysis or carbonization. It is used as a soil conditioner since it reduces acidity and the availability of Al while increasing the pH and the availability of nutrients, especially phosphorus (P) and potassium (K), to plants. In this study, we evaluated P adsorption by clay soils incubated with different doses of biochar made from poultry litter, coconut fiber, and rice straw produced in a drum-type oven. For this, an experiment was conducted at the Irrigation and Salinity Laboratory (ISL) of the Agricultural Engineering Department of the Federal University of Campina Grande, PB, using soil samples collected in the state of Paraíba. Different doses of biochar were added to the soil samples and incubated for 160 days, keeping their humidity at about 70% of field capacity, with the addition of deionized water. These samples were subsequently used in the phosphorus adsorption study. The pH and phosphorus content of the soil after incubation with the different biochars were determined, the parameters of the Langmuir and Freundlich P adsorption isotherms were assessed, and Fourier-transform infrared spectroscopy (FTIR) and X-ray diffractometry (XRD) were performed. Based on the experimental conditions, poultry litter biochar was found to be effective because of its high adsorption capacity, considering that 9 t ha-1 of this biochar could adsorb about 0.223 mg g-1 phosphorus under appropriate conditions.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.