About 30 kg of P/ha in the form of Supa is recommended for cowpea production to help the crop to nodulate well and fix its own nitrogen from the air
pafupifupi 30kg ya p/ha ya supa imalimbikitsidwa ku ulimi wa nandolo kuti izithandiza mbewu kutulutsa tozungulila ta mmitsistsi komanso kuoanga nayitrojeni wake