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Wood Fiber <br />Wood fiber is also known as <br />hydromulch. Longer fiber wood <br />provides greater erosion control <br />protection than short fiber or paper <br />pulp products. Hydromulch is dyed a <br />green color as an aid in application, <br />but soon fades to a light brown color. <br />Wood fiber is mixed into a water <br />slurry solution and sprayed on the soil <br />surface at the rate of 1000 to 2000 <br />pounds per acre. Tackifier, a plant- <br />based glue, is added to the wood <br />fiber mixture when it is applied to <br />slopes. A small amount of wood fiber <br />is added to a tackifier slurry solution <br />for an overspray when used as a glue <br />for hay and straw mulch. <br />Netting <br />5 <br />Netting is used to hold straw and hay mulch in place on steep slopes or in critical <br />areas. Netting should be applied as stated in Erosion Control Matting (Chapter 3,.Section <br />4). <br />Problems may occur if: <br />¦ Inadequate coverage results in erosion, washout, and poor plant <br />establishment. <br />¦ Appropriate tacking agent is not applied or is applied in insufficient <br />amount, leading to the loss of straw or hay mulch to wind and runoff. <br />¦ Netting is difficult to hold to surface on extremely roughened sites. <br />¦ Noxious or persistent weeds are brought in with hay or straw. Certified <br />noxious weed-free straw and hay can be ordered. Inspect hay field prior <br />to purchase or cutting. <br />¦ Too much grain seed in the mulch results in competitive exclusion of <br />seeded species. <br />¦ Netting is stretched over soil contours, leading to erosion underneath. <br />Netting should be loose enough to be in contact with mulch. <br />¦ Netting is too loose. This could allow the wind to catch under the netting, <br />moving the mulch underneath. <br />¦ High application rates of mulch smother germinating seeds. <br />¦ Mulch keeps the soil too cool for seed germination during the wet, early <br />spring period. <br />¦ Grass, alfalfa, straw and hay attract cows and wildlife, causing damage to <br />the new seeding. <br />114 <br />Figure 3.5: A wood fiber mulch is sprayed on the soil <br />surface with a hydromulcher. Gordon Creek 2, 7, & 8 <br />Mines.