Quantitative evaluation of soil erosion rate is an important basic to investigate and improve land use system, which has not been sufficiently conducted in Indonesia. The Universal Soil Loss Equation (USLE) and Erosion Three Dimension (E3D) in Surfer were used to identify characteristic of dominant erosion factors in Sumani Watershed in West Sumatra, Indonesia using data soil survey and monitoring sediment yield in outlet watershed. Climatology data from three stations were used to calculate Rainfall erosivity (R) factor. As many as101 sampling sites were used to investigate soil erodibility (K-factor) with physico-chemical laboratory analysis. Digital elevation model (DEM) of Sumani Watershed was used to calculate slope length and Steepness (LS-factor). Landsat TM imagery and field survey were used to determine crop management (C-factor) and conservation practices (P-factor). Calculating soil loss and map of USLE factor were determined by Kriging method in Surfer 9. Sumani Watershed had erosion hazard in criteria as: severe to extreme severe (26.23%), moderate (24.59%) and very low to low (49.18%). Annual average soil loss for Sumani watershed was 76.70 Mg ha-1 y-1 in 2011. Upland area was designated as having a severe to extreme severe erosion hazard compared to lowland which was designated as having very less to moderate. On the other land, soil eroded from upland were deposited in lowland. These results were verified by comparing one year’s sediment yield observation on the outlet of the watershed. Land use (C-factor), rainfall erosivity (R- factor), soil erodibility (K-factor), slope length and steepness (LS-factor) were dominant factors that affected soil erosion. Traditional soil conservation practices were applied by farmer for a long time such as terrace in Sawah. The USLE model in Surfer was used to identify specific regions susceptible to soil erosion by water and was also applied to identify suitable sites to conduct soil conservation planning in Sumani Watershed.[How to Cite : Aflizar, R Afrizal, T Masunaga. 2013. Assessment Erosion 3D Hazard with USLE and Surfer Tool: A Case Study of Sumani Watershed in West Sumatra Indonesia. J Trop Soils, 18 (1): 81-92. doi: 10.5400/jts.2013.18.1.81][Permalink/DOI: www.dx.doi.org/10.5400/jts.2013.18.1.81]
The existence of PT. CNM Solok becomes very important as one of the guarantor of the availability of Indonesian corn seeds in order to keep corn production in a sustainable manner. In operation PT. CNM Solok in cooperation with PT. Pertani and farmer breeder. During the partnership there were two barriers: the delay in product distribution and the late payment of the contract. The purpose of this research is (1) Analyzing the partnership pattern applied by PT. CNM Solok with farmer breeders and PT. Pertani, (2) Analyze the evaluation of partnership implementation implemented by PT. CNM Solok with farmer breeders and PT. Pertani, (3) Compare the income level of the breeder farmer with regional income standard when partnering with PT. CNM Solok, (4) Describe the level of satisfaction of both partners of PT. CNM Solok is farmer breeders and PT. Pertani to the way the partnership so far. This research was carried out for 2 months from the date of February 20, until May 19 2018 at PT. Citra Nusantara Mandiri Solok, Solok City, West Sumatra. The study used primary data (interviews and contract documents of partnership) and secondary data were processed descriptively qualitative. Partnership pattern of PT. CNM Solok with farmer breeder ie plasma core. While the partnership pattern of PT. CNM Solok with PT. Pertani is subcontracted. The implementation of the partnership has not been fully realized. Farmers' income is lower than UMP with a land area of 0.25 hectares. Partners have been satisfied with existing partnerships
This paper presents the geochemical study of agricultural soil and river sediments along Sumani watershed, West Sumatra in Indonesia. We examined the distribution and abundances of 16 elements (Pb, Zn, Cu, Ni, Cr,V, Sr, Rb, Ce, Th, Zr, Si, Ti, Fe Ca, and P) in vegetable soil, sawah soil =and river sediment sample, to evaluate the factors controlling their abundances, possible sources, and environmental implications. Average concentrations of Pb, Zn, Cu, Ni, Cr,V, Sr, Rb, Ce, Th, Zr at vegetable (1) soil were 38, 88.3, 38.7, 3, 8, 101, 96, 98, 87, 31 and 218 mg kg-1 , 26, 39.05, 8.8, 13.5, 31, 231.5, 37, 19, 78, 16 and 303.5 mg kg-1 at sawah soil (3, 4) and 30, 61.6, 35.7, 9, 22, 294, 65, 12, 78, 14 and 232 mg kg-1 at river sediment (2), respectively. The concentration of Pb, Rb, Th and Zr at upland vegetables, V and Zr at sawah soil and river sediment were mostly two time Sumatra BCSCST or BCC in several samples. Enrichment factor values showed low to moderate enrichment of Pb, Zn, Cu, Rb, Ce and Zr, whereas Th showed significant contamination at vegetables soil, suggesting contributions from anthropogenic sources. Anthropogenic contributions of most metals mainly originate from natural processes. However, Pb, Ce, Th and Zr ranges of 527–108, 41-89, 66-117 and 35-100%, respectively, at Vegetable and sawah soil and river sediment confirm their anthropogenic contribution. Factor analysis and correlation matrices suggested that elevated metal concentrations at agricultural soil in Sumaniwatershed might be controlled by pH, CEC, Fe-oxy-hydroxides. Deposition of metals at vegetable and sawah soil and river sediment might be controlled by non-ferrous metal (i.e., aluminosilicates), sediment grain size, or source rock composition (andesite, alluvial fan, undifferentiated volcanic material, granite and gneiss).Keyword: Agricultural soil, anthropogenic activities, enrichment factor, metals source, river sediment, watershed trace [How to Cite: Aflizar, Muzakkir, R Afrizal and MA Rahman. 2016. Geochemical Investigation of Selected Elements in an Agricultural Soil: Case Study in Sumani Watershed West Sumatera in Indonesia. J Trop Soils 21: 49-66. Doi: 10.5400/jts.2016.21.1.49]
Merantau is a unique form of outmigration in Minangkabau communities. The Minangkabau's strong tendency to migration as a rite de passages especially for young men. They migrate from rural areas to looking for experience, prosperity and education. Its also places a heavier burden on household left behind to make up for lost local labor. The impact of outmigration on agriculture, especially on household left behind has long been debated. Thus identifiying the impact of migration on household in rural origin is an open empirical questio. The main purpose of this paper is to analyse impact of merantau to household left-behind labor allocation in on-farm, off-farm and non-farm activity. The paper uses treatment regression techniques to asses impact merantau on household labor allocation. The result provide that merantau contributes to increase hired labor on paddy farming. Paddy farming operations used 89% hired labor. Merantau reduce labor force participation for household members left behind and increase non-farm activity. Base on the findings, this study contributions to the literature by providing a wider understanding of labor supply decisions in rural household that have migrant and receive financial transfers.
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