Yield Response of a Cowpea Variety on Ground Seashells on Isohyperthermic Arenic Kandiudult of Owerri Southeastern Nigeria

E. U. Onweremadu, C. C. Opara, U. Nkwopara, C. I. Duruigbo and I. I. Ibeawuchi

International Journal of Soil Science 1 ( 3 ): 251 - 257 , 2006