Present study was conducted to analyze the soybean production system in Benin. Data were collected from 324 soybean producers selected from the three major soybean-producing agro-ecological areas i.e. agro-ecological zone 3 (southern Borgou), agro-ecological zone 4 (West Atacora) and agro-ecological zone 5 (Cotton zone of the Centre of Benin). A participatory research approach with group discussions followed by individual interviews was carried out for extracting the information from respondents. Information mainly referred to the socio-demographic characteristics of soybean producers, production practices, extent of yields and constraints. Descriptive statistics were then used to analyze the data. Ordered Probit regression was further carried out to assess the determinants of soybean yield levels in Benin. Results of this study revealed that soybean producers of the three agro ecological zones have most of the common demographic characteristics. They equally revealed that farmers do not follow correct soybean cropping practices. Improved seeds, plant density, fertilizers, fallow, and sex of farmers have significantly (P<0.05, P<0.01, P<0.001) influenced the yields of soybean in Benin. Within the context of sustainable agricultural production practices, it is recommended to develop appropriate technologies for soybean cultivation. The extension services should focus more on the appropriate combination of input resources which are found to contribute more to the soybean production.
Nitrogen-15 isotopic dilution method was used to estimate biological nitrogen fixation (BNF) and nitrogen (N) budget of fourteen (14) soybean varieties using maize as reference crop. The experiment was carried out at Sekou in Southern Benin. The amount of N derived from air (Ndfa kg N ha -1 ) ranged from 51 for variety BRS 261 to 148 for variety Canarana. In a scenario where the soybean shoot dry matter and grains were removed from the field after harvest and only the fallen leaves were incorporated into the soil, the N budget ranged between -91 (Canarana) and -17 kg N ha -1 (BRS 260). When only soybean grain was exported from the fields and fallen leaves and shoot dry matter are incorporated into the soil, the N budget varied from 7 (BRS 261) to 74 kg N ha -1 (BRS Garantia). The study showed that Canarana, TGX 1448 2E and BRS Paraiso soybean varieties fixed the highest amount of N among the 14 varieties. The inclusion of those soybean varieties in cereal-based cropping systems would help reduce N inputs and improve soil and crop productivity in farming systems in Benin.
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