Rice-based farming under rainfed uplands of Northern Luzon [Philippines]: assessment of soil and water management technologies using simulation model
2013
Bareng, J.L.R. | Balderama, O.F. | Alejandro, L.S.
The impact of rainfall regimes and crop management practices in the rainfed uplands of Northern Philippines was examined. Primary goal of the study is to evaluate the performance and adaptability of the Water Erosion Prediction Project (WEPP) model in estimating of rate of soil erosion and run-off under upland rice cultivation. The research involves establishment of automatic weather station and erosion plots with three conservation management as treatments. Analysis was undertaken to characterize rainfall events in terms of amount, intensity, duration and frequency in relation to erosion data. Comparison of actual and simulated data and sensitivity analysis of scenarios for different types of rainfall, slope, and conservation practices were made. Variation result demonstrated statistical acceptability of the WEPP model. Actual and simulated data indicated that 50% soil loss is reduced when contour planting with hedgerow was practiced. The rate of sedimentation is linearly affected by increasing slopes and length, such that, the rate of soil removal ranges 1.2 t/ha to 48.46 t/ha across treatments at 10%-50% slope and 10m-40m slope length. The model can be used to develop decision support tools for conservation, optimization and utilization of farm resources in agricultural watershed units to improved productivity of upland areas in sustainable way.
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