Enhancing land nutrient through rhizobia biofertilization: modeling the joint effects of rhizobium inoculants and improved soybean varieties on soybean productivity in North Central, Nigeria - Kolapo, Adetomiwa; Ojo, Temitope O.; Khumalo, Nolwazi Z.; Elhindi, Khalid M.; Kassem, Hazem S.; Filusi, Olajide Julius (Frontiers in Sustainable Food Systems, 2025)