realizing the difficulties involved in direct measurement of soil properties, in recent years, alternative methods have been employed. in the present research, soil texture, organic carbon, saturation percentage and lime as readily measurable parameters, wilting point, field capacity, cation exchange capacity as well as bulk density, as predicted variables were evaluated. the data set was then ...

Machine learning and geostatistics are efficient techniques for investigating the geographic distribution of soil properties. This study’s objectives were to assess fertility status, map spatial variability selected parameters compare random forest with ordinary kriging. Soil samples collected analyze parameters: pH, cation exchange capacity (CEC) organic carbon (OC) using systematic sampling. ...

Abstract Soil cation exchange capacity (CEC) strongly influences the chemical, physical, and biological properties of soil. As direct measurement CEC is difficult, costly, time-consuming, indirect estimation from chemical physical parameters has been considered as an alternative method by researchers. Accordingly, in this study, a new hybrid model using support vector machine (SVM), coupling wi...

Abstract Ferns (Polypodiophyta) are an abundant floral element of the tropics with high sensitivity to environmental conditions and good indicators overall biodiversity. Here, we set out identify which geochemical factors determine fern diversity in a low-montane tropical rainforest Eastern Ecuador. We conducted field survey high-spatial resolution completing comprehensive inventory across two ...

The objective of this study was to investigate fuzzy clustering analysis based on subtractive clustering algorithm for modeling of Soil Cation Exchange Capacity (CEC). In this work, seventy soil samples were collected from different horizons of 15 soil profiles located in the Ziaran region, Qazvin province, Iran. The data set was divided into two subsets. One for calibration (80% data) and seco...

Copper (Cu) is an essential element for plants and microorganisms at larger concentrations a toxic pollutant. A number of factors controlling Cu dynamics have been reported, but information on quantitative relationships scarce. We aimed to (i) quantitatively describe predict soil (CuAR) in aqua regia considering site-specific effects pH, organic carbon (SOC) cation exchange capacity (CEC), (ii)...

Cation exchange is an interfacial process during which cations on a clay surface are replaced by other cations. This study investigates the effect of oil type and composition on cation exchange on rock surfaces, relevant for a variety of oil-recovery processes. We perform experiments in which brine with a different composition than that of the in situ brine is injected into cores with and witho...

Biochar properties vary, and characterization of biochars is necessary for assessing their potential to sequester carbon and improve soil functions. This study aimed at assessing key surface properties of agronomic relevance for products from slow pyrolysis at 250-800 °C, hydrothermal carbonization (HTC), and flash carbonization. The study further aimed at relating surface properties to current...

This paper presents research on the surface characteristics, specific surface area (SSA), cation exchange capacity (CEC) and the electrophoretic mobility (EPM) of kaolin clays obtained from different naturally occurring pegmatite and granite deposits worldwide. Particular emphasis was placed on studying the influence of ancillary minerals on these properties, as well as the diversity in morphol...