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In civil engineering, a wheel tractor-scraper (also known as a land scraper, land leveler or tournapull) is a type of heavy equipment used for earthmoving. It has a ...
A blue-grey soil colour and a smell of hydrogen sulphide can occur in the top soil due to extenuated aeration . An increase in soil strength can be measured with a penetrometer, which is basically a device for measuring the resistance of a soil. Another important indicator of soil compaction is the vegetation itself.
The soil type—that is, grain-size distributions, shape of the soil grains, specific gravity of soil solids, and amount and type of clay minerals, present—has a great influence on the maximum dry unit weight and optimum moisture content. [6] It also has a great influence on how the materials should be compacted in given situations.
Soon after 1900, the farm tractor was introduced, which made modern large-scale agriculture possible. However, the destruction of the prairie grasses and tillage of the fertile topsoil of the American Midwest caused the Dust Bowl , in which the soil was blown away and stirred up into dust storms that blackened the sky.
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.
The terraces form a series of steps each at a higher level than the previous. Terraces are protected from erosion by other soil barriers. Terraced farming is more common on small farms. This involves creating a series of flat terraced levels on a sloping field.
Topsoil is composed of mineral particles and organic matter and usually extends to a depth of 5-10 inches (13–25 cm). Together these make a substrate capable of holding water and air which encourages biological activity.
The Big Bud 747 or 16V-747 Big Bud is a large, custom-made farm tractor built in Havre, Montana, in 1977. It has 1100 horsepower. It is billed by the owners and exhibitors as the "World's Largest Farm Tractor". [1] It is about twice the size of many of the largest production tractors in the world, depending on parameter. [2]