Methods of soil analysis.

TL;DR: The effects of 20 years of potassium (K) fertilization on grain and stover yields, plant K concentrations, aboveground K uptake, K use efficiencies, soil K pools, and the K balance were examined in a Haplic Phaeozem soil under a rain-fed mono-cropped spring maize (Zea mays L.) system in the province of Jilin, northeast China.

TL;DR: The use of treated wastewater in irrigation is increasing in Tunisia, and it is imperative to study the impact of this water category on soil as discussed by the authors, which is an excellent case study to evaluate the impact on geochemical properties of isohumic soils.

TL;DR: Soils in the investigated sites proved to be deficient in major macronutrients and to contain toxic levels of Cu, Zn, Pb and Cd, and these tolerant and native plant species could be used as tools for an effective phytorestoration of metal-contaminated sites.

TL;DR: In this article, the authors evaluated the extent to which digital elevation models (DEM) derivatives and machine learning algorithms (k-nearest neighbor, support vector machine, decision tree (DT) and random forest) can be used for predicting the location and extent of salt-affected areas within the Vaalharts and Breede River irrigation schemes of South Africa.

TL;DR: In this paper, the authors present a modeling approach aimed at seasonal resolution of global climatic and edaphic controls on patterns of terrestrial ecosystem production and soil microbial respiration using satellite imagery (Advanced Very High Resolution Radiometer and International Satellite Cloud Climatology Project solar radiation), along with historical climate (monthly temperature and precipitation) and soil attributes (texture, C and N contents) from global (1°) data sets as model inputs.

TL;DR: In this paper, the Century ecosystem model was applied to a series of forest and grassland sites distributed globally to examine large-scale controls over soil carbon, including soil texture and foliar lignin content.

TL;DR: In this article, the Rothamsted model is used to calculate the amount of CO2 that would be released from the world stock of soil organic matter if temperatures increase as predicted, the annual return of plant debris to the soil being held constant.

TL;DR: In this paper, the formation of soil structure involves the physical forces of shrinking and swelling created by changes in water status of soils, freezing and thawing, tillage, or by movement of the larger biota in soils.