P-factors in universal soil loss equation (USLE) of various conservation practices on hillslope at Mae Sa integrated watershed and forest land-use project, Changwat Chiang Mai
1998
Nipon Tangtham | Aphinan Korporn (Kasetsart Univ., Bangkok (Thailand). Faculty of Forestry. Dept. of Conservation)
P-factor in the USLE, the ratio of soil loss between conservation meausures plot and up and down plowing plot, of 4 soil conservation measures namely bench terrace (BT), intermittent terrace (IT), hillside ditch (HD), and contour bund (CB) was determined based on soil loss during 1980 to 1990 observed from three replications of 5*20 meter runoff plots on 30 percent slopling area at Mae Sa integrated Watershed and Forest Land-use Project, Chiang Mai. Results showed that P-factor for BT, IT, HD and CB was averaged at 0.128, 0.245, 0.299 and 0.214 respectively. The same pattern of erosion control efficiency was also derived when P-factor was determined based on soil loss per a unit of rainfall factor and on mm of water loss.
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