Abstract
One of the hazards of the erosion is soil infiltration capacity is decreased in the place of occurrence of erosion and increasing the volume of surface flow. It will also lead to the occurrence of the superficiality of the river due to the deposition of materials of soil erosion. These hazards need alternative agrotechnology which could reduce the rate of soil erosion. This research is to know the hazard of soil erosion in the upper watershed of the Aie Limau Kambiang and find out the alternative agrotechnology for reducing the soil erosion. This research was conducted. Soil samples collected was taken in purposive random sampling based on a unit of land. The data were analyzed using the universal soil loss equation. The research results of the largest erosion threat come from the land use of traditional gardens and plant density is low. The highest erosion 151,012.00 ton/ha/year was founded on the plantation blended that have a steep slope over 35% LS value of 9.5. The better of agrotechnology with increasing plant density, that could reduce erosion to 503.40 ton/ha/year. This means that the hazard of soil erosion could be controlled with land management and selected of the better agrotechnology.
Highlights
Upstream river basin area based on its function is a conservation area or water catchment area
The average erosivity during the last six years is 246,112. This erosiveness demonstrates the ability of the destructive force of rain to crush aggregate soil into clay fraction, dust and sand
This is closely related to the maximum amount of rainfall, the amount of rain that occurs in each rainy month
Summary
Upstream river basin area based on its function is a conservation area or water catchment area. This is because the upstream area has a steeper slope. Due to the high pressure of the population, this area is targeted as a farming area, such as gardens that generally do not pay attention to soil conservation methods so that the surface flow and erosion are high [1]. Erosion occurs due to the process of destruction of soil aggregates by the kinetic energy of rainfall. The ground was washed away by the strength of the surface flow to the lower slope and kept partway into the stream and deposited on the quiet and flat part [2]
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