Abstract. Kahirun, Sabaruddin L, Mukhtar, Kilowasid LOMH. 2019. Evaluation of land use impact on river water quality using macroinvertebrates as bioindicator in Lahumoko Watershed, Buton Island, Indonesia. Biodiversitas 20: 1658-1670. The Lahumoko Watershed, a small watershed, that empties into the sea is sensitive to water quality changes due to land use changes by humans. Uncontrolled land use changes can threaten the sustainability of the river ecological functions of the watershed. It is important to examine the comparison of river water quality in locations that represent land uses. So, the objectives of this study were to reveal the impact of land use on biological water quality in rivers and to analyze the relationship between macroinvertebrates communities with parameters of biodiversity and physicochemical at the observation locations that represented land use. Biological samplings were done using a hand net with a hole size of 0.5 mm mesh, at five stations, each with three replications, with a length of 30 m of each replication, 60 minutes per station. The results of the study showed that individual abundance, family biotic index and diversity index parameters indicated that the water quality was quite good in the upstream watershed (LM1, LM2, and LM3 stations) and somewhat worse in the middle (LM4 station) and downstream of the watershed (LM5 station). The Spearman's correlation, Dendrogram, and Canonical Correspondent Analysis (CCA) showed that there were similarities among LM1, LM2 and LM3 stations, and also between LM4 and LM5 stations. Physicochemical parameters, especially the velocity and flow rate of the river flow had significant correlation with individual richness and density.  

Organic food agriculture, especially rice, is a potential business opportunity in the present and in the future. This is based on the principle of the benefits of organic food, which puts forward the principles of good health for plants, soil, animals, earth, and humans as an interconnected and inseparable whole. The objectives of this study were to analyze the economic and financial feasibility of organic rice farming in North Buton Regency, to analyze the economic and financial viability of farming when input prices change, and to compare the feasibility of organic rice farming in various bank groups. The data used in this study are primary and secondary data, the variable coverage of which consists of the amount of organic rice production, production price, and the components of farm costs. Respondents were determined using accidental sampling technique, in order to obtain 60 farmer household respondents. Furthermore, an economic and financial feasibility analysis approach is used which consists of 3 criteria, namely net present value, net benefit-cost ratio, and internal rate of return. The results showed that: (1) organic rice farming in North Buton Regency based on economic and financial feasibility criteria is feasible to be cultivated and or developed, (2) Even though there has been a change in input prices, organic rice farming in Buton Utarata Regency is feasible to be cultivated and or developed, (3) the selection of business investment credit in the state-owned bank group and the national private bank group is more feasible to operate, while the business investment credit in the regional government bank group is vulnerable to the risk of loss. Therefore, in applying for investment credit for organic rice farming, farmers must choose a financial institution in the state bank group or national private bank.