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Characterizing and managing erosion sensitivity in the Jompi watershed, South East Sulawesi, Indonesia

Sumahir La Ode, Mukrimin Mukrimin, Baharuddin Baharuddin, Marwah Sitti

Ecological Engineering & Environmental Technology

2025

Vol. 26, iss. 2

272--279

Soil erosion is a major environmental issue in watershed areas, particularly those experiencing land use changes, such as the Jompi watershed in Muna Regency, where forest conversion to agriculture, settlements, and open land accelerates erosion. Analyzing erosion sensitivity is crucial for identifying high-risk areas, guiding sustainable land management, and supporting soil and water conservation efforts to prevent land degradation and ensure agricultural productivity and ecological stability. The study was conducted in the Jompi watershed, Muna Regency, with the aim of analyzing erosion sensitivity in the Jompi watershed area. The research employed a combination of field surveys and laboratory analysis, supported by a land unit approach. Land units were created by overlaying slope maps, land use maps, and soil type maps using geographic information systems (GIS). The final determination of the number of Land units was based on ensuring uniform characteristics and excluding units that did not meet the required map accuracy scale. The results indicated that erosion sensitivity in the Jompi watershed ranged from very low to very high, with most of the area classified as having very low erosion sensitivity. Effective management of erosion sensitivity can be achieved through vegetation management, land use regulation, and soil quality improvement.

Utilization of Dry Land Using Molybdenum, Lime, and Rhizobium Strains to Increase Soybean Yield

Maulana Zulkifli, Muhibuddin Andi, Nasution Muhammad Arief, Abri Abri, Amiruddin Amirudin, Baharuddin Baharuddin, Fitriyah Andi Tenri, Sirajuddin Sitti Nurani, Al Tawaha Abdel Razzaq M.

Journal of Ecological Engineering

2023

Vol. 24, nr 8

128--136

Ultisol is a type of soil with low organic matter, pH, and nutrient content, including molybdenum, leading to low productivity. This study aimed to investigate the use of dry land using molybdenum and lime (CaCO3) inoculated with Rhizobium strain Nod+Fix+ to increase the soybean production of Willis and Baluran cultivars. This research was conducted from May to September 2021 in Pallangga Subdistrict, Gowa Regency, South Sulawesi, Indonesia. The study used a split-plot design with three replications for each treatment. The first factor was soybean varieties, consisting of Baluran and Willis cultivars. The second factor was the composition of the bacterial strain Nod+ Fix+, lime CaCO3 and NH4-molybdate, which consisted of without (Rhizobium strain Nod+ Fix+ + CaCO3 + NH4-molybdate); Rhizobium strain Nod+ Fix+ + CaCO3 1.0 ton/ha + NH4-molybdate 250 g/h); Rhizobium strain Nod+ Fix+ + CaCO3 1.5 tons/ha + NH4-molybdate 500 g/h); and Rhizobium strain Nod+ Fix+ + CaCO3 2.0 tons/ha+ NH4-molybdate 750 g/h). The results showed that treating the bacterial strain Nod+ Fix+ + MoCo (1.0:0.6) kg/ha achieved the best results on growth, nutrient uptake (Nitrogen, Phosphorus and Potassium), and soybean yields, both for Willis and Baluran varieties on ultisol soils.