Sustainability of maize-based cropping systems is a major challenge for southern Africa, yet the demand for maize as staple food and animal feed in the region continues to increase. A study was conducted on a sandy clay loam (220 g clay kg-1 soil) at Domboshawa in Zimbabwe to investigate the long-term effects of organic resource quality and application rate, and nitrogen (N) fertilization on so...

*Serguei V. Koptsik, and Faculty of Physics, Moscow State University, Moscow 119899, Russia; Galina N. Koptsik, Soil Science Faculty, Moscow State University, Moscow 119899, Russia. *Corresponding author:mailto:[email protected] ABSTRACT Soil chemistry is analysed in terrestrial ecosystems subjected to airborne pollution in the fragile boreal environment in the industrial part of the Kol...

Elevated anthropogenic nitrogen (N) deposition has greatly altered terrestrial ecosystem functioning, threatening ecosystem health via acidification and eutrophication in temperate and boreal forests across the northern hemisphere. However, response of forest soil acidification to N deposition has been less studied in humid tropics compared to other forest types. This study was designed to expl...

Forest soils having low exchangeable calcium (Ca) and other nutrient base cation (BC) reserves may induce nutrient deficiencies in acid-sensitive plants and impact commercially important tree species. Past and future depletion of soil BC in response to acidic sulfur (S) deposition, forest management, and climate change alter the health and productivity of forest trees. This study used a process...

Abstract Soil testing laboratories across the United States have implemented Mehlich‐3 (M3) extraction method for phosphorus (P) and other nutrients. Though M3 is known to work well as a multinutrient extractant, it raises concerns measuring exchangeable cations, particularly in calcareous soils. The objectives of this study were (a) evaluate an extractant base cations Kansas soils, (b) identif...

Sorption of molecular amines by montmorillonite involves protonation of the amine group and hydrolysis of the interlayer cation. Sorption and subsequent desorption of amines may render some of the interlayer cations non-exchangeable, thus causing partial 'chloritization' of the montmorillonite. The effect is stronger with interlayer A1 than Ca ions and depends upon the amine sorbed. I N T R O D...

Call a random partition of the positive integers partially exchangeable if for each finite sequence of positive integers n l , . . . , nk, the probability that the partition breaks the first nl + . . . § nk integers into k particular classes, of sizes nl . . . . , nk in order of their first elements, has the same value p(na . . . . . nk) for every possible choice of classes subject to the sizes...

The mixed oak-pine ecosystems in the southern Appalachians are in decline because of a combination of drought and southern pine-beetle infestation. A commonly applied prescription for restoration of these degraded sites has been to fell all vegetation, allow it to dry, and conduct a site-preparation burn. However, there is little information on the midand long-term influences of this prescripti...

Road salt deicers, especially NaCl and CaCl2, are increasingly applied to paved areas throughout the world. The goal of this study is to investigate the influence of high concentrations of these salts on wetland biogeochemistry. Sediment cores were collected in fall and spring from a freshwater wetland fringing an urban kettle lake (Asylum Lake, Kalamazoo, MI, USA), and incubated for 100 days i...

Rock formation as parent material in Pagedongan Village, Banjarnegara influences the properties of soil formed. The purpose this research was to identify morphology and classification according USDA Taxonomy, National Soil Classifications, World Reference Base for Soils. This study uses a survey method by determining observation points based on rock formation, namely Peniron Formation, with pyr...