No abstract

Increase of CO2 concentration in the atmosphere has increasingly become an issue as it causes global warming. Such an increase is partly brought about by change in land use and land cover. The research is aimed at identifying type of cropping system in smallholder coffee plantation in Tana Toraja district that provide the best CO2 sequestration. The CO2 sequestration were analysed by sampling the CO2 content of plant biomass, plant residues, stems, soil organic matters, and undercover plants at varieties of coffee cropping system in Rante Deata village. The best CO2 sequestration is the cropping system of coffee with Gliricidia (Gliricidia sepium) as shading plant (231.25 MT CO2 ha-1), followed by the intercrop of cocoa and coffee with Gliricidia (Gliricidia sepium) and suren (Toona sureni) as shading plant (198.55 MT CO2 ha-1). The least CO2 sequestration is obtained at the cropping system of coffee – clove intercrop without shading plant (137.44 MT CO2 ha-1).

South Sulawesi is one of the provinces in Indonesia which contributes 6.6% to national soybean production. Soybean productivity in South Sulawesi is on average above the national soybean productivity. However, soybean farmers have not been able to draw many benefits from the high productivity because in general they are soybean farmers for consumption purposes. This study aims to look at opportunities to increase the income of soybean farmers through the change from consumption farmers to soybean breeder farmers. The method used in this study is a business feasibility analysis by calculating the R/C ratio and B/C ratio, social capital in the form of social networks of farmers on the West Coast and East Coast of South Sulawesi, and climate mapping using ArcGis 10.5. The results showed that the feasibility of soybean business in the West Coast of South Sulawesi for breeders and consumption farmers each had an R/C ratio of 2.33 and 1.33, while the B/C ratios were 1.72 and 0.72. The soybean business on the East Coast of South Sulawesi for breeders and consumption farmers each had an R/C ratio of 2.25 and 1.63, while the B/C ratio were 1.25 and 0.63. Social capital in the form of a social network between the West Coast and the East Coast has the potential to be developed into a network of soybean breeder that produce continuous (based on unique climate) in South Sulawesi.