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The Vetiver System is used in more than 100 countries for soil and water conservation, infrastructure stabilization, pollution control, waste water treatment, mitigation and rehabilitation, sediment control, prevention of storm damage and other environmental protection applications (through bioengineering and phytoremediation).
Chrysopogon zizanioides, commonly known as vetiver and khus, is a perennial bunchgrass of the family Poaceae.. Vetiver is most closely related to Sorghum while sharing many morphological characteristics with other fragrant grasses, such as lemongrass (Cymbopogon citratus), citronella (Cymbopogon nardus, C. winterianus), and palmarosa (Cymbopogon martinii).
Chrysopogon zizanioides is a directly related species of the perennial type grass that has been more widely adopted by farmers, especially in India. [2] However, the two forms of vetiver grass are very similar in their benefits and growing conditions; the largest difference is that Chrysopogon zizaniodes has been more widely studied and used, especially to create fragrances.
Wind throw is the toppling of a tree due to the force of the wind, this exposes the root plate and adjacent soil beneath the tree and influences slope stability. Wind throw is a factor when considering one tree on a slope; however, it is of lesser importance when considering general slope stability for a body of trees as the wind forces involved represent a smaller percentage of the potential ...
Contour plowing or contour farming is the farming practice of plowing and/or planting across a slope following its elevation contour lines. These contour line furrows create a water break, reducing the formation of rills and gullies during heavy precipitation and allowing more time for the water to settle into the soil. [ 1 ]
The width of strips is determined by a number of factors, with the two most important being the average wind velocity in a specific site and the features of the slope, particularly the gradient. [3] Each strip typically ranges from 25 feet (7.6 m) to 75 feet (23 m) in width, but certain conditions may necessitate widths outside of this range. [4]
More generally, therefore, re-profiling systems are associated with and integrated by surficial protection of the slope against erosion and by regulation of meteoric waters through drainage systems made up of ditches and small channels (clad or unclad and prefabricated) to run off the water collected.
"Pull": Strip of Signal grass (Brachiaria brizantha) planted along the edge of a push-pull field in Kenya. The approach relies on a combination of companion crops to be planted around and among maize or sorghum. Both domestic and wild grasses can help to protect the crops by attracting and trapping the stemborers. The grasses are planted in the ...