Open AccessDetermination of the most dominant cause factors due to erosion in the farmland of Sibolangit sub-district
Author(s) -
Shanti Desima Simbolon,
Zulkifli Nasution,
Abdul Rauf,
Delvian Delvian
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/725/1/012080
Subject(s) - erosion , tillage , universal soil loss equation , manure , environmental science , hydrology (agriculture) , regression analysis , crop , soil loss , mathematics , soil science , statistics , geography , geotechnical engineering , agronomy , geology , forestry , biology , paleontology
Solving erosion problems is often inefficient and effective because of lack a deep understanding of the most dominant causal factors. It really depends on how the results of our research of the factors that influence and relate to each other. Erodibility, slope and crop management are three factors that influence the amount of erosion. Each of these factors has a different index value indicating differences in the magnitude of the effect on erosion. The erosion model designed to predict long-term erosion is the USLE Method. The formula for the USLE equation is as follows: A = R.K.L.S.C.P where A=the amount oferoded soil in tonsha −1 year −1 ; R=rainfall factor; K=soil erodibility factor; L=slope length factor; S=slope factor; C=crop management factors; P=soil conservation factor. The statistical analysis used to answer the most dominant factor is multiple linear regression analysis. The results of this research showed that the highest erosion was 11,302.79 tons ha −1 year −1 in SPT-24, followed by SPT-5 of 3192.88 tons ha −1 year −1 and SPT-25 of 2408.33tonsha −1 year −1 while the lowest erosion on SPT-26 is 21.06 tons ha −1 year −1 . Based on the analysis results obtained the most dominant factor is soil erodibility with a coefficient of determination (R 2 ) of 61.4% so that the focus on erosion handling offarmland in Sibolangit Sub-Districtis minimum and contour tillage, optimize use of green manure and compost, land cover with plant litter. All of the aim is to improve each factor that affects erodibility, namely texture, structure, permeability and soil organic matter.