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The NRCS curve number is related to soil type, soil infiltration capability, land use, and the depth of the seasonal high water table. To account for different soils' ability to infiltrate, NRCS has divided soils into four hydrologic soil groups (HSGs). They are defined as follows. [1]
Sheet mulch has important advantages relative to conventional methods, such as tilling, plowing or applying herbicides: Improvement of desirable plants' health and productivity. [1] Retention of water and nutrients and stabilization of biochemical cycles. [1] Improvement of soil structure, soil life, and prevention of soil erosion. [1] [7]
the permissible long term average depth of the water table (Dw) on the basis of agricultural drainage criteria; the soil's hydraulic conductivity (Ka and Kb) by measurements; the depth of the bottom of the aquifer (Di) the design drain spacing (L) can be found from the equation in dependence of the drain depth (Dd) and drain radius (r ...
Bark chips applied as mulch. A mulch is a layer of material applied to the surface of soil. Reasons for applying mulch include conservation of soil moisture, improving fertility and health of the soil, reducing weed growth, and enhancing the visual appeal of the area. A mulch is usually, but not exclusively, organic in nature.
In agriculture, mulch tillage (or mulch-till) is a seeding method where a hundred percent of the soil surface is disturbed by tillage, [1] crop residues are mixed with the soil and a certain amount of residues remain on the soil surface. A great variety of cultivator implements are used to perform mulch-till.
Time-lapse of Tigercat mulcher clearing brush. Forestry mulching is a land clearing method that uses a single machine to cut, grind, and clear vegetation.. A forestry mulching machine, also referred to as a forestry mulcher, forest masticator, or brushcutter, uses a rotary drum equipped with steel chipper tools ("teeth") or blades to shred vegetation. [1]
The Universal Soil Loss Equation (USLE) is a widely used mathematical model that describes soil erosion processes. [1]Erosion models play critical roles in soil and water resource conservation and nonpoint source pollution assessments, including: sediment load assessment and inventory, conservation planning and design for sediment control, and for the advancement of scientific understanding.
In soil science, soil gradation is a classification of a coarse-grained soil that ranks the soil based on the different particle sizes contained in the soil. [1] Soil gradation is an important aspect of soil mechanics and geotechnical engineering because it is an indicator of other engineering properties such as compressibility , shear strength ...