Penentuan Laju Erosi Pada Tanah Andepts Menggunakan Tanaman Jagung Dan Teras Bangku Dengan Metode Usle Dan Petak Kecil Di Lahan Kwala Bekala Universitas Sumatera Utara

Abstract

RIAN HIDAYAT LUBIS: The determination of Erosion Rate on Andepts Soil Using Corns Plants and Bench Terrace With USLE Methods and Small Plots in Kwala Bekala Estate University of North Sumatera, supervised by SUMONO and LUKMAN ADLIN HARAHAP. The way to prevent the soil degradation (erosion) is using vegetation methods (plants) and mechanical methods (terrace). This study was aimed to determine tolerable erosion rate and Erosion Hazard Level (TBE) on Andepts soil using corns plants and bench terrace with slope of 9%, in April-July 2014 in the District of Kwala Bekala using small plots and USLE predictions. The results showed that the amount of erosion using small plots for control land was 1,79 ton/(ha.year), on corns land was 1,67 ton/(ha.year), and on bench terrace land was 0,44 ton/(ha.year) respectively with low Erosion Hasard Level (TBE) category. USLE predictions based on 10 years of rainfall data for control land was 49,34 ton/(ha.year), on corns land was 31,34 ton/(ha.year), and on bench terrace land was 17,27 ton/(ha.year) respectively with Erosion Hazard Level (TBE) category of low to moderate. Predictions based on the USLE for 4 months rainfall data for control land was 6,28 ton/(ha.year), on corns land was 4,003 ton/(ha.year), and on bench terrace land was 2,19 ton/(ha.year) respectively with low Erosion Hazard Level (TBE) category. The amount of tolerable erosion rate was 29 tons/(ha.years).