. Deep-rooted plants for erosion control on granitic road fills in the Idaho Batholith. . and 1972, respectively; reductions were significant at the 95 percent level in 1970 and 1972 and at the 90 percent level in 1971. Mulches caused a highly significant reduc- tion in erosion that averaged about 95 percent of that occurring on the control plots for the 3 years of data. Mulch effects would be expected to lessen over time as the mulch material deter- iorates. Slight time trends did appear on most plots; overall average reductions in erosion of 98, 94, and 92 percent were recorded for the 1970,
. Deep-rooted plants for erosion control on granitic road fills in the Idaho Batholith. . and 1972, respectively; reductions were significant at the 95 percent level in 1970 and 1972 and at the 90 percent level in 1971. Mulches caused a highly significant reduc- tion in erosion that averaged about 95 percent of that occurring on the control plots for the 3 years of data. Mulch effects would be expected to lessen over time as the mulch material deter- iorates. Slight time trends did appear on most plots; overall average reductions in erosion of 98, 94, and 92 percent were recorded for the 1970, 1971, and 1972 water years, respectively. Similarly, the growth of trees on the unmulched plots would be expected to provide greater erosion protection over time; however, no consistent time trends were detected nor were block effects with respect to erosion, even though growth averaged about 40 percent higher in the block located near the top of the road fill. 14. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Megahan, Walter F. cn; United States. Forest Service. cn. Ogden, Utah : Intermountain Forest and Range Experiment Station, Forest Service, U. S. Dept. of Agriculture
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