Soil chemistry

upright=1.6|class=skin-invert-image|thumb|right|Sodium "gives" one outer electron to [[fluorine, bonding them to form sodium fluoride. The sodium atom is oxidized, and fluorine is reduced.]] thumb|right|upright=1.25|When a few drops of glycerol (mild reducing agent) are added to powdered [[potassium permanganate (strong oxidizing agent), a violent redox reaction accompanied by self-ignition starts.]]

biogeochemical cycle by which carbon is exchanged among the biosphere

pollution of land by human-made chemicals or other alteration

group of minerals

measure of the acidity or alkalinity in soils

biogeochemical movement

biogeochemical cycle of sulfur

any chemical compound with a carbon–sulfur covalent bond

approach for economic control of pests

discipline embracing all chemical and mineralogical compounds and reactions occurring in soils and soil-forming processes

measure of soil chemistry

application of minerals to soil

buildup of hydrogen cations, which reduces the soil pH

ratio

study of the impacts and processes that organisms have had on the Earth

organic compounds that are important components of humus

soil type

Glomalin is a hypothetical glycoprotein produced abundantly on hyphae and spores of arbuscular mycorrhizal (AM) fungi in soil and in roots. Glomalin was proposed in 1996 by Sara F. Wright, a scientist at the USDA Agricultural Research Service, but it was not isolated and described yet. The name comes from Glomerales, an order of fungi. Most AM fungi are of the division Glomeromycota. An elusive substance, it is mostly assumed to have a glue-like effect on soil, but it has not been isolated yet.

Graph of concentrations of different species of a polyprotic acid, as a function of pH, when the solution is at equilibrium

thumb|300px|right|Calcareous sandstone in [[Seven Sisters Country Park, England]]

transformation of Fe(OH)2 into Fe3O4 with hydrogen release

thumb|Look of tomato plants when missing essential nutrients they need Agrominerals (also known as stone bread or petrol fertilizer) are minerals of importance to agriculture and horticulture industries for they can provide essential plant nutrients. Some agrominerals occur naturally or can be processed to be used as alternative fertilizers or soil amendments. The term agromineral was created in the 19th century and is now one of the leading research topics for sustainable agriculture. These geomaterials are used to replenish the nutrients and amend soils. Agrominerals started with small uses