The contribution of off-season weeds to the supply and conservation of soil nutrients under sweetpotato [Ipomea batatas (L.)] ridges in Tanzania

No Abstract. UNISWA Research Journal of Agriculture, Science and Technology Vol. 8(1) 2005: 16-2

Effects of carbamate and pyrethroid insecticides on cowpea bradyrhizobial population assessed in sand culture and on nitrogen fixation in soil

No Abstrac