Potassium distribution in soil profiles under no-tillage system
HIGHLIGHTS Study reveals K accumulation in upper soil layers under no-tillage systems. Findings emphasize deep K fertilization to prevent surface runoff and erosion. We suggest revising K availability diagnosis methods for no-tillage soil systems. Highlights limited K migration, urging precise fertilization near root growth zones. ABSTRACT Potassium (K) vertical mobility in soils has often been […]
Sediment source tracing in a Brazilian subtropical catchment using diffuse reflectance: Effect of spectral ranges, pre-processing techniques, and multivariate model
HIGHLIGHTS SVM outperforms PLSR for sediment source modeling, showing higher R² and lower RMSE. SGD pre-processing significantly improves SVM models, while PLSR benefits from SNV. UV-VIS spectra were less effective for source tracing compared to NIR and MIR. Reducing sediment sources enhances model reliability and decreases uncertainties. ABSTRACT Agriculture intensification in Southern Brazil’s subtropical regions […]
Chemical and mineralogical constitution of redoximorphic features and mechanism of formation of Plinthosols from the Araguaia River plain, Brazil
HIGHLIGHTS There are gaps in the knowledge of redoximorphic features in Plinthosols. Samples of the soil matrix, mottle, and plinthite features were analyzed. The total contents of silicon, aluminum, and iron accounted for 96% in all features. Higher iron contents occurred in plinthite, followed by mottle and matrix. Mottles and plinthite were not originated by […]
Estimation of soil organic carbon content by Vis-NIR spectroscopy combining feature selection algorithm and local regression method
HIGHLIGHTS Estimation of soil organic carbon content using Vis-NIR spectroscopy. Compare different feature band selection methods. Improvement of the way genetic algorithms are coded. ABSTRACT Soil organic carbon (SOC) content is a critical parameter for evaluating soil health. However, high redundancy and invalid information in soil hyperspectral data can reduce the accuracy and stability of […]
Edaphic properties in a eucalyptusforest ecotone in the Nova Baden State Park, Southeastern Brazil
HIGHLIGHTS State parks are integral protection units created to protect ecosystems. Studies on soil properties in ecotone areas are still scarce. Higher litter and soil organic matter content were observed in eucalyptus area. Edaphic properties in the ecotone area were more similar to orest fragment. Biogenic aggregates showed highest organic carbon values and its fractions. […]
Stabilization of organic matter in soils: drivers, mechanisms, and analytical tools – a literature review
HIGHLIGHTS Biochemical recalcitrance lost prominence as the physical protection and organo-mineral interaction mechanisms were investigated. Soil fauna has a prominent role in decomposition and SOM stabilization across various scales. Micro-scale analytical techniques, including those based on synchrotron radiation, propped the advances in mechanistic understandings of SOM stabilization. Further research of SOM dynamics in the tropics […]
