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[72] [71] Platy soil structure and soil compaction ... It is the surface chemistry of mineral and organic colloids that determines soil's chemical properties. [88]
Soil chemistry is the study of the chemical characteristics of soil.Soil chemistry is affected by mineral composition, organic matter and environmental factors. In the early 1870s a consulting chemist to the Royal Agricultural Society in England, named J. Thomas Way, performed many experiments on how soils exchange ions, and is considered the father of soil chemistry. [1]
Age and origin of the source material determine the chemical structure of humic substances. In general, humic substances derived from soil and peat (which takes hundreds to thousands of years to form) have higher molecular weight, higher amounts of O and N, more carbohydrate units, and fewer polyaromatic units than humic substances derived from ...
Soil texture determines total volume of the smallest pores; [56] clay soils have smaller pores, but more total pore space than sands, [57] despite a much lower permeability. [58] Soil structure has a strong influence on the larger pores that affect soil aeration, water infiltration and drainage. [59]
Soil has a crucial function in the global carbon cycle, with the global soil carbon pool estimated to be 2,500 gigatons. This is 3.3 times the amount of the atmospheric pool at 750 gigatons and 4.5 times the biotic pool at 560 gigatons.
The best way to determine if the soil is acidic or deficient in calcium or magnesium is with a soil test which a university can provide with an agricultural education department for under $30.00 for United States residents. [8] Farmers typically become interested in soil testing when they notice a decrease in crop response to applied fertilizer.
[4]: 65 It is a variety of laterite (residual sedimentary rock), so it has no precise chemical formula. [31] It is composed mainly of hydrated alumina minerals such as gibbsite [Al(OH) 3 or Al 2 O 3 . 3H 2 O)] in newer tropical deposits; in older subtropical, temperate deposits the major minerals are boehmite [γ-AlO(OH) or Al 2 O 3 .H 2 O] and ...
Its structure is a 2:1 sandwich of silica ... The chemical formula is given as (K,H 3 O)(Al ... (1993). "Ch. 3: Soil Mineralogy". Fundamentals of soil behavior