View allAll Photos Tagged Humus,
Paso 4: Ir incorporando humus o compost (materia orgánica para enriquecer la tierra y darle fuerza) a la tierra arneada e ir mezclando constantemente.
*La proporción de materia orgánica dependera de que que tan buena este la tierra, en este caso estaba increible asi que no fue necesario incorporarle mucho.
The mollic epipedon is a mineral surface horizon that is relatively thick, dark colored, and humus rich and has high base saturation. It has dark color and low chroma in 50 percent or more of its matrix. It typically has a Munsell color value of 3 or less when moist and of 5 or less when dry and chroma of 3 or less when moist. If its structure is fine granular or fine blocky, the sample, when broken, may show only the color of the coatings of peds. See Soil Taxonomy “(Soil Survey Staff, 1999) for a complete definition.
Mollisols are mineral soils that have a mollic epipedon. The unique properties of Mollisols are a combination of a very dark brown to black surface horizon (mollic epipedon) that makes up more than one-third of the combined thickness of the A and B horizons or that is more than 25 cm thick and that has structure or is not hard or very hard when dry; a dominance of calcium among the extractable cations in the A and B horizons; a dominance of crystalline clay minerals of moderate or high cation-exchange capacity; and less than 30 percent clay in some horizon above 50 cm if the soils have deep, wide cracks (1 cm or more wide) above this depth at some season. See Soil Taxonomy “(Soil Survey Staff, 1999) for a complete definition.
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Landscape: This soil is in the poorly drained, slowly permeable Tonka series. Tonka soils are in plane or slightly concave, closed basins and depressions on till and glacial lake plains. They are Argiaquic Argialbolls with a mollic epipedon up to 24 inches thick (about 12 inches in the photos). Most areas are cultivated. Corn, soybeans, and small grains are the main crops. A small acreage is in hay and pasture. Native vegetation is prairie.
Upper left: Observation pit in an area of Tonka soil. A small pit to a depth of 50 cm was excavated to determine surface color and thickness and presence of a depleted matrix.
Upper right: The surface horizon had a color of 10YR 3/1 with strong fine granular structure.
Lower left: A section of the upper soil was removed and studied for the presence of redox features.
Lower right: The horizon directly below the mollic epipedon had a depleted matrix with matrix color of 10YR 4/2 and common distinct redox concentrations and common distinct depletions lining pores.