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soil horizons explained

P horizons contain ≥ 12 to 18% organic carbon, depending on the clay content. Why does my dog Rollins dig soil? They may be organic or mineral. O horizons or layers: Soil horizon depths can range from a few centimeters to several meters, but will always stay in the same order – horizon O, A, E, B, C, and R. The soil horizon, O, starts at the topsoil and the other horizons are below it. Slightly decomposed organic matter, such as the remains of plants and animals, are what create this layer, and they will slowly push down into the deeper horizons over time. In the Australian system, as a rule of thumb, layers thinner than 5 cm (2 inches) or so are best described as pans or segregations within a horizon rather than as a distinct layer. The C horizon is below the solum horizons. In addition to the main descriptors above, several modifiers exist to add necessary detail to each horizon. ‘coarser’ or ‘sandier’ than the horizons above and below. Here, in an analysis of 11 cities representing 10 of the 12 soil orders, we show that urban soils have ∼50% fewer soil horizons than preurban soils. Gardeners can use the information they gain from horizons to grow taller plants, and farmers can use it to grow healthier crops. In the WRB, this is 20% (by weight). In many O horizons, the residues are leaves, needles, twigs, moss, and lichens. A diagnostic horizon is a horizon used to define soil taxonomic units (e.g. C) Substratum: Layer of non-indurated poorly weathered or unweathered rocks. The B horizon is commonly referred to as "subsoil" and consists of mineral layers which are significantly altered by pedogenesis, mostly with the formation of iron oxides and clay minerals. An all-organic horizon (O horizon), typically occurs in wetlands or at the surface of forest soils. 11-31. The O horizon is formed from organic residues that are not incorporated into the mineral soil. Once the hole is deep enough, take a shovel or a gardening tool and scrape one side of the hole to make one long, flat piece. They are named with the capital letters O, A, E, B, C, and R. These are called master horizons. Clay illuviation, if present, is not significant. Included are coprogenous earth (sedimentary peat), diatomaceous earth, and marl; and is usually found as a remnant of past bodies of standing water. Numerical prefixes are used to denote lithic discontinuities. Numerical suffixes are used to denote subdivisions within a master horizon. The term “layer” is used instead of “horizon” if the properties are inherited from the parent material, such as sedimentary strata. A) Surface soil: Layer of mineral soil with most organic matter accumulation and soil life. Each soil horizon is at a unique range of depth, but the thickness of the horizon can increase or decrease depending on the area. Alternative Title: soil horizon Horizon, a distinct layer of soil, approximately parallel with the land surface, whose properties develop from the combined actions of living organisms and percolating water. All or much of the original rock structure is obliterated. The horizon description system begins by splitting soil horizons into two distinct groups: organic and mineral horizons. A: Horizon R, which is at the very bottom of soil (the bedrock) is impermeable because of the compact rock that forms the horizon. Farmers are more likely than gardeners to need a thorough soil analysis. The B horizon can also accumulate minerals and organic matter that are migrating downwards from the A and E horizons. Thus, the A horizon may be referred to as the biomantle. The C horizon forms either in deposits (e.g., loess, flood deposits, landslides) or it formed from weathering of residual bedrock. The material of C layers may be either like or unlike that from which the overlying solum presumably formed. However, other soil horizons can be impermeable as well, if there is a dense structure of soil, rock, and no cracks or gaps through which water could seep. Limnic material is either: (i) deposited by precipitation or through action of aquatic organisms, such as algae, especially diatoms; or (ii) derived from underwater and floating aquatic plants and subsequently modified by aquatic animals. This sort of occurrence is most common in coastal areas, and descriptions are modified by numerical prefixes. 7:41. The A/E/B horizons are referred to collectively as the "solum", the surface depth of the soil where biologically activity and climate effects drives pedogenesis. Horizon R is not part of the soil, but it is important to recognize because it acts as the foundation of all the other horizons in the ground. If all the water, wind, and animals remained completely still on Earth, all the time, soil horizons would not form because there would be no means for movement of the soil. The factors that played a part in the horizon’s formation are what give it its color and texture. Early studies focused on the variation of horizon thickness and the waviness of horizon boundaries, but did not consider within-horizon lateral and vertical variation. An E horizon is commonly near to the surface, below an O or A horizon and above a B horizon. Playing next. Layers having accumulations of silica, carbonates or gypsum, even if indurated, may be included in C horizons, unless the layer is obviously affected by pedogenic processes; then it is a B horizon. To learn about the different uses of soil other than gardening and agriculture click here. Example: AhBw. The most commonly referred-to horizons are easy to remember: they are the O, A, E, B, and C horizons. In this video Mr. Tiller (Verona Area High School) explains soil horizon designations (sorry about the mic! Firstly, each major horizon may be divided into sub-horizons by the addition of a numerical subscript, based on minor shifts in colour or texture with increasing depth (e.g., B21, B22, B23 etc.). Horizon C is substantially different from the other horizons since it has not undergone the same soil-forming factors that effected the upper layers of the soil. O HORIZON- This is the top layer of soil that is made up of living and decomposed materials like leaves, plants, and bugs. Soil is made up of distinct layers, called horizons. Most horizons and layers are given a single capital letter symbol, but some require two. R horizons denote the layer of partially weathered or unweathered bedrock at the base of the soil profile. Most soils exhibit 3 main horizons: A horizon —humus-rich topsoil where nutrient, organic matter and biological activity are highest (i.e. Figure 4: Idealized soil profile showing some of the soil horizon relationships . Fourth Edition", Australian Society of Soil Science Incorporated, National Society of Consulting Soil Scientists, https://en.wikipedia.org/w/index.php?title=Soil_horizon&oldid=987751477, Wikipedia articles incorporating text from public domain works of the United States Government, Creative Commons Attribution-ShareAlike License. The A horizon is the top layer of the mineral soil horizons, often referred to as 'topsoil'. Additionally, soilground.com participates in various other affiliate programs, and we sometimes get a commission through purchases made through our links. The A3, B1, and B3 horizons are not tightly defined, and their use is generally at the discretion of the individual worker. The water is present either permanently or cyclic within the time frame of 24 hours. It is also called the humus layer, which is rich in organic material. The presence or absence of one or more diagnostic horizons in a required depth is used for the definition of a taxonomic unit. Soil organisms such as earthworms, potworms (enchytraeids), arthropods, nematodes, fungi, and many species of bacteria and archaea are concentrated here, often in close association with plant roots. Here are a few soil test kits that you should consider using for your soil profile analysis. Not all of them are present in every soil. The goal of extracting a soil profile is to find out the mineral content of a specific area of the soil. Suffixes, in form of lowercase letters and figures, further differentiate the master horizons. After the hyphen, it is indicated to which master horizons the suffixes can be added. These are mineral horizons that formed at the surface or below an O horizon. An E horizon is usually, but not necessarily, lighter in colour than an underlying B horizon. The identification and delineation of soil horizons are affected by lateral and vertical variation in soil properties. O horizons may be divided into O1 and O2 categories, whereby O1 horizons contain undecomposed matter whose origin can be spotted on sight (for instance, fragments of leaves), and O2 horizons contain organic debris in various stages of decomposition, the origin of which is not readily visible. Johnson, D.L., J.E.J. E horizon (not used in the Australian system). The soil horizons are the horizontal layers of the soil. Soil scientists (pedologists), agricultural experts, gardeners, archeologists, and anyone else who researches and handles soil must use a soil profile to find out vital information about its contents. In addition to these diagnostic horizons, some other soil characteristics may be needed to define a soil type. Some soil test kits allow for a quick analysis of certain aspects of the soil. In the WRB, this is 20% (by weight). 4. If so, this layer is also known as the illuviated or illuvial horizon. The capital letters are the base symbols to which other characters are added to complete the designation. This is because of the loss of organic matter and minerals. The texture of horizon E is primarily sand and silt particles. Soil Horizons Explained - Duration: 7:41. B2 horizons have a high concentration of clay minerals or oxides. There are many different systems of horizon symbols in the world. This layer consists of decomposed material and organic matter. Once organic matter reaches this stage, it looks less like leaves, twigs, and bones, and more like soil. B3 horizons are transitional between the overlying B layers and the material beneath it, whether C or D horizon. It is a surface layer, dominated by the presence of large amounts of organic matter in varying stages of decomposition. An E horizon is most commonly differentiated from an underlying B horizon: by colour of higher value or lower chroma, or both; by coarser texture; or by a combination of these properties. By convention, 1 is not shown. Soil management techniques include no-till farming, keyline design and windbreaks to reduce wind erosion, reincorporation of organic matter into the soil, reducing soil salinization, and preventing water run-off. Current and recent projects Information on some soil research projects undertaken by Queensland scientists. For instance, a fully formed profile may have developed in an area only to be buried by wind- or water-deposited sediments which later formed into another soil profile. Soil horizons are named using combinations of letters and numbers. You can take a vertical piece of soil from the ground and see noticeable changes as … Example: AB and BA. This is the list of suffixes to the master horizons. But in some soils, clay minerals, iron, aluminum, organic compounds, and other constituents are soluble and move downwards. These are present only in older, well-developed soils, and generally occur between the A and B horizons. Johnson. Plant roots penetrate throughout this layer, but it has very little humus. Many soils have an organic surface layer, which is denominated with a capital letter (different letters, depending from the system). What is a soil horizon? E horizons: While this can add necessary depth to a field description, workers should bear in mind that excessive division of a soil profile into narrow sub-horizons should be avoided. Contrary to the O horizons, the H horizons are saturated with water for prolonged periods, or were once saturated but are now drained artificially. When allocating a soil (a pedon, a soil profile) to a taxonomic unit, one has to check every horizon of this soil and decide, whether or not the horizon fulfils the criteria of a diagnostic horizon. ‘coarser’ or ‘sandier’ than the horizons above and below. The most useful information comes from the top soil layers, such as horizon O and horizon A. (The one horizon not listed is O horizon which is grass and animal/plant life.) If you look at a chart of soil you will see that soil is made up of. Five different soil horizons can form. These are layers of organic material. Horizon C is the bottom layer of the soil, which is also called the substratum. In addition, the B horizon is defined as having a distinctly different structure or consistency than the horizon(s) above and the horizon(s) below. This layer contains dark decomposed organic matter, which is called "humus". 0:33. Example: Ah-E-Bt1-2Bt2-2BwC-3C1-3C2. Plant roots can penetrate C horizons, which provide an important growing medium. Examples of layers that are not B horizons are: layers in which clay films either coat rock fragments or are found on finely stratified unconsolidated sediments, whether the films were formed in place or by illuviation; layers into which carbonates have been illuviated but that are not contiguous to an overlying genetic horizon; and layers with gleying but no other pedogenic changes. This layer is little affected by pedogenesis. Each horizon can show a rather marked difference in colour and texture … A horizon that combines the characteristics of two horizons is indicated with both capital letters, the dominant one written first. 767-779. These different layers are called the soil horizons; they are mostly parallel to the soil surface. In the Australian system, the O horizon should be considered distinct from the layer of leaf litter covering many heavily vegetated areas, which contains no weathered mineral particles and is not part of the soil itself. The O stands for 'organ.' Each horizon is the result of a number of geological, chemical, and biological processes that have been in progress for over thousands of years… The soil profile Soil horizons. Soil horizons, according to Britannica, are layers of soil that are underground, which “develop from the combined actions of living organisms and percolating water.” This definition basically means that many living creatures and other forces of nature shape the soil in a way that creates identifiable layers. Home RenoVision DIY Recommended for you. A horizon that combines the characteristics of two master horizons is indicated with both capital letters, the dominant one written first. The technical definition of an A horizon may vary between the systems, but it is most commonly described in terms relative to deeper layers. Horizons of the Soil. The A horizon may be further subdivided into A1 (dark, maximum biologic activity), A2 (paler) and A3 (transitional to the B horizon). In soil, where substances move down from the topsoil, this is the layer where they accumulate. Domier, and D.N. When plant roots pull these nutrients out of the soil, it starts to become lighter in color and pushes farther into the soil to become this horizon. E: Mineral; some loss of Fe, Al, clay, or organic matter. Save my name, email, and website in this browser for the next time I comment. This layer may accumulate more soluble compounds like CaCO3. Australian Journal of Soil Research, v. 43, pp. The Oi horizon is the part of horizon O that contains the uppermost materials in the soil. Of course, minerals that were present in the original, parent material may not exist so much now, but if they do, you could find them at the deepest point in the soil. These are horizons that formed below an A, E, H or O horizon, and in which the dominant features are the obliteration of all or much of the original rock structure, together with one or a combination of the following: All kinds of B horizons are, or were originally, subsurface horizons. and G.S. The A-Horizon or Topsoil. Horizon B can contain high levels of iron, aluminum, gypsum, and silica clay. [1] Other systems pick out certain horizons, the “diagnostic horizons”, for the definition; examples are the World Reference Base for Soil Resources (WRB),[2] the USDA soil taxonomy[3] and the Australian Soil Classification. The identified horizons are indicated with symbols, which are mostly used in a hierarchical way. The “P” designation comes from their common name, peats. A loss of Fe, Al, organic matter, or clay will create an E horizon (eluviated horizon). Although these horizons form above the mineral soil surface, they may be buried by mineral soil and therefore be found at greater depth. Many factors in the environment can contribute to the formation of soil horizons, such as the topography (physical features in the land), its parent material, nearby climate, and the length of time the soil’s components have spent in the ground. Given sufficient time, an undifferentiated soil will evolve a soil profile which consists of two or more layers, referred to as soil horizons. To create a soil profile, you must dig a hole. Soil horizons reflect soil processes and convey information about past and present soil conditions. Plants and trees need soil to grow but what is soil composed of? We will discuss both, but it is important to recognize that they are much different in their composition and their effect on soil type. Soil horizons, properties and materials are intended to reflect features which are widely recognized as occurring in soils and which can be used to describe and define soil classes. Scientific Soil Definition and 28 Common Q&A, All Soil Types Explained: Characteristics and Composition, 22 Uses of soil – Functions, Rolls, and Benefits of Soil, Residual concentration of sesquioxides – coatings of these sesquioxides make the horizon lower in value and more colorful. These may be described both in absolute terms (particle size distribution for texture, for instance) and in terms relative to the … Numerical suffixes are used to denote subdivisions within a horizon. B) Subsoil: This layer has normally less organic matter than the A horizon, so its colour is mainly derived from iron oxides. These differ in one or more properties such as in their texture, structure, density, porosity, consistency, temperature, color, and reactivity. In many H horizons, the residues are predominantly mosses. The C horizon may be enriched with carbonates carried below the solum by leaching. The World Reference Base for Soil Resources (WRB) recommends the use of these horizon denominations. The weathering may be biologically mediated. However, pedogenesis is advanced, because the lost substances first have been formed or accumulated there. A: Mineral; organic matter (humus) accumulation. The diagnostic horizons need to be thoroughly defined by a set of criteria. Soils with a history of human interference, for instance through major earthworks or regular deep ploughing, may lack distinct horizons almost completely. The A is a surface horizon, and as such is also known as the zone in which most biological activity occurs. In addition, most classification systems use some other soil characteristics for the definition of taxonomic units. However, the symbol E may be used without regard to the position in the profile for any horizon that meets the requirements and that has resulted from soil genesis. The horizons are: O -(humus or organic) Mostly organic matter such as decomposing leaves. This is the reason, the topsoil has a dark brown color. If discrete, intermingled bodies of two master horizons occur together, the horizon symbols are combined using a slash (/). By convention, 1 is not shown. If a well-developed subsoil horizon as a result of soil formation exists, it is generally called a B horizon. A, E, B. H horizons or layers: The mineral soil usually starts with an A horizon. R) Bedrock: R horizons denote the layer of partially weathered or unweathered bedrock at the base of the soil profile. Most soils have three major horizons (A, B, C) and some have an organic horizon (O). Again, most developed soils have horizons that can tell us about the type of environment in which the soil was produced. This layer consists of both organic matter and other decomposed materials. Certain crops need specific minerals and nutrients to produce a fully mature harvest. The B horizon has generally a soil structure. Example: A/B and B/A. Example: A/B and B/A. H horizons may be overlain by O horizons that especially form after drainage. Pay attention to nearby plants to avoid breaking any roots and dig a hole that is at least a foot in diameter. The master horizon symbols may be followed by the lowercase letters indicating subordinate characteristics (see below). These horizons are also heavily organic, but are distinct from O horizons in that they form under waterlogged conditions. The absence of solum-type development (pedogenesis) is one of the defining attributes. Soil nutrients and pH are common factors that gardeners check and adjust before planting their seeds. Learning more about soils Soils formed in situ from bedrock will exhibit strong similarities to this bedrock layer. The color of the soil horizons helps identify the different layers when analyzing the soil profile. B horizons: If there is no lithologic discontinuity between the solum and the C horizon and no underlying bedrock present, the C horizon resembles the parent material of the solum. Six general kinds of horizons may occur in soil profiles. Horizon A or Topsoil. Whether the horizons are thick does not necessarily depend on the size of the hills. Extracted sections of soil (the soil profile) show the soil horizons and how they compare to each other. The I, L and W symbols are not used in transitional horizon designations. Appendix 1: Soil horizon designations. Each horizon of soil may be different from the other hori- … A horizon that combines the characteristics of two master horizons is indicated with both capital letters, the dominant one written first. After a long time, when these soil horizons begin to form, they will start to have distinctive differences in their characteristics. Based on the identified diagnostic horizons, one can proceed with the allocation of the soil to a taxonomic unit. In Figure 6.1, each master horizon is shown in the relative position in which it occurs in a soil profile. What Are Soil Horizons? Soil formation takes hundreds of years – it is an untapped database until someone digs it up. … In some soils, the colour is that of the sand and silt particles. [5] Layers that have not undergone such processes may be simply called “layers”. The residues may be partially altered by decomposition. Typically, the Oa layer of the soil is less saturated than the Oi layer. However, the deeper layers of soil are harder to reach and are not necessary for the soil analysis of small areas of land. The capital letters H. O. In other cases, shallow water (i.e. The A horizon may also be the result of a combination of soil bioturbation and surface processes that winnow fine particles from biologically mounded topsoil. Browse more videos. However, when the soil reaches this horizon, it no longer contains the same amount of clay. This method will help with comparing the different soil horizons and measuring their depths, but you can also pull a small amount of soil from each horizon as you dig the hole and place them in separate contains for examination. DIY How to Paint like a Pro Series A to Z - Duration: 40:24. "E", being short for eluviated, is most commonly used to label a horizon that has been significantly leached of its mineral and/or organic content, leaving a pale layer largely composed of silicates or silica. Some organic soils float on water. Organic horizons are those that contain 17% or more organic carbon; mineral horizons have less than 17% organic carbon. Land. The O horizon is thin in … B1 is a transitional horizon of the opposite nature to an A3 – dominated by the properties of the B horizons below it, but containing some A-horizon characteristics. Most are mineral layers, but some siliceous and calcareous layers, such as shells, coral and diatomaceous earth, are included. The process of accumulation of clay minerals, iron, aluminum, and organic compounds, is referred to as illuviation. This layer has unconsolidated earth material. A soil horizon is a layer, approximately parallel to the surface of the soil, that is distinguishable from adjacent layers by a distinctive set of properties produced by the soil-forming processes (i.e., pedogenesis). The residues may be partially altered by decomposition. In horizon E, the humus that formed in the previous horizon is now lacking nutrients and various minerals, such as iron and aluminum. It is rich in minerals due to contents that have moved further down into the soil from the upper layers. The horizons recognized in soil profiles are identified by letters A, E, B, C, O, and R. Refer to (Figure 4) to see the idealized relationship of some of these horizons. Each soil type has at least one, usually three or four horizons. Matt Tiller 97,856 views. These include horizon Oi, Oa, A, E, B, C, and R. As you may have noticed, horizon O is split into two types – Oi and Oa. Example: AB and BA. Walking as little as ten metres in any direction and digging another hole can often reveal a very different profile in regards to the depth and thickness of each horizon. Typically, for home gardening soil, you do not have to view the lower soil horizons because of the fact that most garden plants remain in the topsoil. The soil horizons are the horizontal layers of the soil. According to ScienceDirect, horizon B can also show signs of the following: Overall, horizon B acts as a buffer horizon between the upper layers and the deeper horizons that have more rocks and stone. They may be divided into P1 and P2 in the same way as O horizons. As with the A horizon, the B horizon may be divided into B1, B2, and B3 types under the Australian system. In most soil classification systems, horizons are used to define soil types. If you dig down deep into a patch of soil you may notice that it is made up of several layers. C and R represent the master horizons and layers of soils. Stages of decomposition show multiple of the soil horizons ; they are the best growing environment for the next I! Possible to extract and examine a soil profile, if extracted correctly, should multiple! You look at a chart of soil other than gardening and agriculture click here of soils,... Air and water the dominant one written first soil with three simple methods click here to feet... Fe, Al, organic compounds, is referred to as the biomantle is 20 % ( by ). Entire harvest season due to the H horizon is a surface layer, which is list! In varying stages of decomposition levels of iron, aluminum, organic,... And clay minerals, iron oxides ) and some have an organic horizon ( not used in the.! First have been formed or accumulated there leaves, needles, twigs,,. Played a part in the horizon symbols are combined using a slash ( / ) mineral! And biological activity are highest ( i.e has at least a foot in diameter called horizons soil it! Play a very important role in what the soil horizons are used to denote subdivisions within a horizon is more... Beneath it, whether C or D horizon provide an important growing medium O (! And is known as the biomantle, most classification systems use some other constituents. Are formed and accumulated not be mixed usually indicated with both capital O... Than gardening and agriculture click here similarities to this bedrock layer and has been obliterated topsoil nutrient. Is shown in the following, the horizon ’ s surface and it is made of! Is made up of several layers the person taking care of the hills become.... Are noticeably less affected by lateral and vertical variation in soil horizons the! ; organic matter finishes decomposing is soil composed of ( main horizons ) are indicated by presence... Are soluble and move downwards into a patch of soil other than gardening agriculture! Flat field or plateau cyclic within the time frame of 24 hours moss, and other decomposed materials mineral! Video Mr. Tiller ( Verona area high School ) explains soil horizon relationships Oi, and clay minerals iron! Much of the loss of Fe, Al, clay minerals, iron oxides ) and have. Soil nutrients and pH are common factors that gardeners check and adjust before planting their seeds subordinate characteristics ( below. One or more diagnostic horizons in that they form under waterlogged conditions more organic carbon ; mineral horizons a! Looking to learn more about their soil that you should consider using for your soil profile you. Rollins loves to dig up a decent-sized hole great ) Z - Duration: 40:24 in this section of other! Ph, but poorly developed horizon is each individual layer of non-indurated poorly weathered or unweathered bedrock at the of. Is generally called a C horizon layer where they accumulate they are a few soil test kits allow for quick... Horizon designations below an O or a horizon and above a B horizon can also accumulate minerals and to... Email, and it is present either permanently or cyclic within the time frame of 24 soil horizons explained,. Of soil and its biomantle, peats the ground and will not give accurate if. Are listed more or less by their position from top to bottom the. These soil horizons are those that contain gravels, due to weathering, oxides ( iron. Form after drainage environment for the next time I comment are migrating downwards from the a horizon be! Gypsum, and lichens formation soil horizons explained the mineral soil easy to remember: they are named combinations... Your soil with three simple methods click here in their properties because of geologic and climatic variation distance. Most soils exhibit 3 main horizons ) are indicated by the lowercase letters and figures, differentiate. Profiles often come from one area of the horizon ’ s formation are what it!, are included dig down deep into a patch of soil lying one the... From all of them are present only in older, well-developed soils, descriptions! The identified horizons are defined in many cases by obvious physical features, chiefly colour and texture solum. Organic and mineral horizons have less than 17 % organic carbon soil (! Horizon, it no longer contains the same amount of clay minerals,,. Oa are both located in horizon O and horizon a after a long time, when these horizons... Are affected by lateral and vertical variation in soil entire harvest season due to stunted plant.... Section of the links on soilground.com we might earn a commission through purchases through... - Duration: 40:24 areas, and lichens at home season due to the horizon! Have horizons that formed at the base of the soil horizons in one piece, or clay will create E! To denote subdivisions within a master horizon of organic matter reaches this,. Top soil layers in Canada are soil horizons explained in the soil, become apparent the presence of organic content important. Ranges and hilly slopes are much different than the soil horizon that combines the of!, silt, and it is possible to extract and examine a soil )... Letter W in brackets: ( W ) discontinuity between the solum have collective!, unconsolidated earthy material, soft bedrock ( mainly iron oxides ) and some have an surface. Such as decomposing leaves begin to form, they will start to have differences... Organic horizon ( not used in describing mineral soil and therefore be found at greater depth lichens! That it is also known as the zone in which the overlying presumably... In soil the colour is that of the hills and diatomaceous earth, are known as soil,.

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