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A properly designed and installed extensive green-roof system can cost $108–$248/m 2 ($10–$23/sq ft) while an intensive green roof costs $355–$2,368/m 2 ($33–$220/sq ft) However, since most of the materials used to build the green roof can be salvaged, it is estimated that the cost of replacing a green roof is generally one third of the ...
Root barriers are also used to separate plant roots from each other. In particular, walnut trees secrete the chemical juglone which is toxic to other plants but the use of root barriers can prevent the yield reduction that would normally occur when walnut trees are alley cropped with maize as often occurs in the American Midwest. [3] [4]
Vegetative barriers are narrower buffer strips of hardy, native, perennial grasses or shrubs planted in parallel rows to crops. [5] They are very effective in reducing wind and water erosion which results in sediment trapping and water infiltration. They function in a similar fashion to a contour buffer strip, just much narrower. [1]
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Equipment costs and availability will vary. The placement of a root barrier can offer additional protection to trenching, but increases total costs. A geomembrane is a semipermeable textile (similar to landscape fabric) that physically blocks roots from coming into contact. It is essential that trenching and geomembrane installation occur ...
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