The impact of water management systems and biofertilizers on soybean production in type B tidal swamp lands in Kapuas district, Central Kalimantan, Indonesia

Acid sulfate land is a land resource that can be optimized to achieve soybean selfsufficiency. Management of irrigation systems and the use of biological fertilizers play an important role in efforts to increase yields. This research aimed to determine the effect of biological fertilizer application and water management systems on soybean yields on tidal swamp land of overflow type B. The research was carried out on potential acid sulphate land of overflow type B using a Split Plot Design with the main plot, namely water management, namely the system management with trenches 20 cm deep and without trenches and subplots is the use of biological fertilizer, namely, Rhizobium sp., Mycorrhiza, Rhizobium sp. specific for acid land, Rhizobium sp. + Mycorrhiza. Management of water level without channels and without the addition of biological fertilizer for cultivating soybean plants in the dry season on type B tidal land is effective in maintaining soil pH that can be tolerated by soybean plants. There was no interaction and no significant effect of regulating the water level with ditches and adding biological fertilizer on the productivity of soybean plants due to rising water levels.