Efficient substrates based on anaerobic sewage sludge biochar for tobacco seedlings in floating systems

Desenvolvimento Inicial De Acacia Mearnsii Em Substrato Contendo Biocarvão Derivado De Finos De Carvão Vegetal

“…The aeration space (AS) also showed a significant decrease in the treatments with higher percentage of CF, ranging from 36% (control) to 14% (treatment with higher concentration of CF). These findings regarding TP and EA are consistent with those observed by Monteiro et al, 2021, where the authors verified a linear reduction of these parameters by adding biocarbon from anaerobic sewage sludge to the commercial substrate. However, they differ from the data obtained by Yan et al, (2020), who observed an increase in aeration space and porosity with the addition of biochar.…”

“…It is assumed that this result occurs because the physicochemical properties of the seedlings are outside the ideal range for the growth of the seedlings, especially the pH values, resulting in reduced growth of the species and lower biomass production that can be attributed to a sensitivity of the species to a higher pH (alkaline). While in this study the suggested dose is 5% of biochar, Monteiro et al, (2021) when incorporating biochar from anaerobic sewage sludge to the commercial substrate for seedling production of A. mearnsii suggested an application of biochar around 45-50%. According to the authors, it was observed that increasing proportions of biochar influenced the properties of the substrate and consequently the development of A. mearnsii seedlings that is conditioned mainly with the hydraulic properties of the substrate and concentrations greater than 50% of biochar led to a reduction in the performance of the substrate-plant system.…”