Disponibilidade De Nutrientes E Carbono Orgânico Em Solos Contendo Carvão Hidrotérmico Lavado E Não Lavado E Comparação Com Solos Antropogênicos

Abstract

NUTRIENT AND ORGANIC CARBON RELEASE IN SOILS CONTAINING WASHED AND NOT WASHED HYDROCHAR COMPARED TO ANTHROPOGENIC SOILS. Hydrochar washed (1.0, 2.5, 5.0 and 10.0 %) and not washed (10.0%) produced by hydrothermal carbonization using vinasse and sugarcane bagasse was applied in sand, ultisol and oxisol columns, and the release of NO 3 -, Orthophosphate, SO 4 2-, Total Organic Carbon (TOC), H + were evaluated for 30 days. These results were compared with the release of these parameters from experiments conducted with anthropogenic soils. The results demonstrated that higher amounts of nutrients were released for the experiments conducted with hydrochar not washed. With higher rates of hydrochar washed, higher the amount of nutrients released. TOC and SO 4 2were released throughout the experiment, which is beneficial from the agricultural point of view. Low values of orthophosphate and nitrate release in the leachates were observed for ultisol and oxisol due to the clay and iron and manganese oxides contents. Principal components analysis confirmed the observations and demonstrated that SO 4 2and TOC preferentially influence the oxisol, being that nitrate and pH influenced the columns containing Terra Mulata and sand. The results allow to conclude that it is possible to adjust the application rate of hydrochar in soils with lower fertility in order to increase it as observed for anthropogenic soils.

Insights on Molecular Characteristics of Hydrochars by 13C-NMR and Off-Line TMAH-GC/MS and Assessment of Their Potential Use as Plant Growth Promoters

“…The choice of HTC parameters, the use of sugarcane bagasse, vinasse or process water, and phosphoric acid or sulfuric acid was made considering the previous studies aiming hydrochar soil application [ 36 , 37 , 54 , 55 , 56 ] (the sugarcane bagasse collection was authorized and registered with the National System for the Management of Genetic Heritage and Associated Traditional Knowledge (SisGen) N°A0018C2).…”

Fulvic acids from Amazonian anthropogenic soils: Insight into the molecular composition and copper binding properties using fluorescence techniques

“…TM is considered as a model of fertile soil, and researchers have been focusing on trying to reproduce this kind of soil in the laboratory, or at least, reproducing its characteristics (Cernansky, 2015). Techniques such as hydrothermal carbonization has been explored as an alternative to reproduce this anthropogenic soil particularities (dos Santos et al, 2020;Fregolente et al, 2020;Bisinoti et al, 2019;Bento et al, 2019;Santana et al, 2019;Melo et al, 2017;Silva et al, 2017;Kambo and Dutta, 2015). Therefore, it is essential to know the intrinsic characteristics of TM and this study can be a guide for those who seek to mimic these properties.…”

“…collected from layers, 0 to 30 cm deep, air-dried, and sieved through a 2 mm mesh to remove roots and fragments. Soil characterization can be found in Oliveira et al (2018) and Santana et al (2019).…”