Deep, medium-grain soils are best for filtering, moisture balance and nutrient retention. Clay soils create such conditions and may cause rot and poor nutrient uptake. The soil structure, texture and depth varied across the site and consisted of poorly sorted sand, silt and gravel with cobbles, boulders and areas of rock outcrop. Type C is the least stable soil. Soil depth was a … It's important to remember that a trench can be cut through more than one type of soil. kristinetpo08 kristinetpo08 Correct would be: Clay. Porous soils allow voids in the soil, creating aeration, which is important for root health. Which type of soil is the most porous? Soil texture is determined by the relative proportion of sand, silt, clay and small rocks (pebbles) found in a given sample. Soils can be classified as Type A, Type B, or Type C. Type A soil is the most stable soil in which to excavate. Soil can be classified on the basis of the size of the particle and its water holding capacity into clay soil, sand soil and loam soil, silt soil. However, sands have less total pore space by volume, or porosity, than clays, loams or silts. Particles of clay and organic matter help hold nutrients in the soil. Sand is gritty to the touch and the individual grains or particles can be seen with the naked eye.It is the largest of the three size classes of soil particles. In this article, You will read Soil Characteristics i.e. Clay soil has the finest particles of all the soils. Properties of Soil - Physical, Chemical, and Biological for UPSC (Biogeography). When dealing with soils, "porous" usually refers to how fast water enters a soil. New questions in Biology. They are the most porous soil. Soil is the upper weathered layer of the Earth's crust affected by plants and animals. Water enters sands faster than it does other soil types because the pores in sand are large. The large pore spaces allow water to drain through the soil quickly, and porous soil often holds fewer nutrients than other soils. Hence, it is the least porous soil. Most plant life cannot withstand soils that are soggy or boggy. Permeable soils are well-balanced and stable whereas those with poor drainage may cave in or compact. Porous soils have a low holding capacity for water and become saturated quickly. In some soils, the loss of just a few inches of topsoil may result in a yield reduction of 50%. Migration of the fuel was aided by the porous soil structure and surface run-off during the melt [112]. Sand soil has the largest size of particles. If you are eager to plant a garden at your new home, discovering the soil is rock hard is discouraging. See answer rsangliana399 rsangliana399 Loam is the most porous in soil. Include the name of the molecule and the cell that is responsible. 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