Comparison of soil properties between surface and plow pan layer with different management groups, ordinary ( ), and sandy-textured (+). Dotted lines indicate 1:1 lines. It is because of the establishment of an oxidation–reduction interface between the plow layer and the plow pan layer due to the immediate intrusion of the atmospheric oxygen into the porous plow layer after drainage and the stagnation of soil water in the plow pan layer from ill permeation of the layer. Iron mottles are filmy in the layer. For this episode of the No-Till Farmer podcast, brought to you by FR8STAR, we share a discussion between Ralph Upton Jr. of Springerton, Illinois, and ag researcher John Pike, covering their exchange which delves into research Upton had done on his farm after a 1983 drought revealed that he had a plow pan layer about 6 inches deep in his soil profile that was preventing his crops from getting ... A pan is a hard, cement-like layer in the soil or subsoil which can be very harmful because it prevents surplus water draining away freely and restricts root growth. Such a layer may be caused by ploughing at the same depth every year. Such ploughing produces a ‘plough pan’ and is partly caused by the base of the plough sliding along the furrow. The mouldboard plow remains among the most effective tools for crop residue burying and soil loosening (Bowen 1981). However, the development ofa compacted soil layer, referred to as a "plow pan" is often associated with using this implement (Brady 1990). The detrimental impacts of plow pans on crop production have been reported for years. For The roots often follow crooked paths as they try to find zones of weakness in the soil. Rooting density below the plow layer is a good indicator for subsoil compaction. Roots are almost completely absent from the subsoil below severe plow pans and often move horizontally above the pan (see figure 6.6). Keep in mind, however, that shallow-rooted ... A plow pan is a subsurface horizon or soil layer having a high bulk density and a lower total porosity than the soil directly above or below it as a result of pressure applied by normal tillage operations, such as plows, discs, and other tillage implements. Plow pans may also be called pressure pans, tillage pans, or traffic pans.
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