Journal of Agronomy1812-53791812-5417Asian Network for Scientific Information10.3923/ja.2015.234.240KarikariB. ArkorfulE. AddyS. 42015144Phosphorus is a major limiting nutrient in soils in Ghana. Selection of cowpea varieties that produce good seed yield under low soil phosphorus or those with high phosphorus response efficiency can be a low input approach in solving this problem in Ghana. Two seasons experiments were conducted to evaluate influence of phosphorus (P) fertilizer on growth, nodulation and yield in cowpea. The experiment comprised 12 treatment combinations of 3 cowpea varieties and 4 levels of triple super phosphate (46% P2O5) laid out as a factorial in RCBD with four replications. The cowpea varieties were Asetenapa (IT81D-1951), Asomdwee (IT94K-410-2) and IT89KD-347-57 and levels of P were 0, 20, 40 and 60 kg ha1 P2O5. In the present study, Asomdwee and IT89KD-347-57 recorded the highest and lowest crop growth of 7.88 and 2.02 g m2 day1 at 45 and 60 days after planting, respectively. Growth rate was not consistent with P application; however, application rate of 60 kg ha1 P2O5 yielded the least growth rate in the entire study period except for 60 days after planting in the minor season. Statistically, Asetenapa and Asomdwee recorded similar number, effectiveness and dry weight of nodules and were significantly different from that of IT89KD-347-57 in both seasons. Number, effectiveness and dry weight of nodules in all varieties were directly proportional to rates of P fertilizer application in both seasons. Asomdwee produced the highest seed yield of 1557.00 and 1415.00 kg ha1 for major and minor seasons, respectively. The rate of P fertilizer application was directly proportional to the seed yield in all three cowpea varieties. The highest seed yield of 1682.00 and 1476.00 kg ha1 for major and minor seasons, respectively was produced at 60 kg ha1 P2O5 application. Farmers are, therefore, encouraged to use P fertilizer in cowpea production in Ghana.]]>Agboola, A.A. and G.H. Obigbesan,1977107175Ankomah, A.B., F. Zapata, G. Hardarson and S.K.A. Danso,19962 fixation by cowpea cultivars at different phosphorus levels.]]>221015Asiamah, R.D.,19981998Aune, J.B. and R. Lai,19951995pp: 499-520pp: 499-520Ayodele, O.J. and A.A. Oso,20149485489Cobbinah, F.A., A.A. Addo-Quaye and I.K. Asante,2011Vigna unguiculata (L.) Walp) accessions with desirable traits from eight regions of Ghana.]]>62132CSIR/CRI.,20122012Haruna, I.M. and A. Usman,2013Vigna unguiculata L. Walp) under varying phosphorus rates in Lafia, Nasarawa State, Nigeria.]]>5209215Haruna, I.M. and L. Aliyu,2011Sesamum indicum L.) as influenced by poultry manure, nitrogen and phosphorus at Samaru, Nigeria.]]>3948844887IITA.,20032003Magani, I.E. and C. Kuchinda,2009Vigna unguiculata [L.] Walp) in Nigeria.]]>2313871393Mokwunye, A.U. and A. Bationo,20022002pp: 209-224pp: 209-224Ndakidemi, P.A. and F.D. Dakora,2007Vigna unguiculata) and maize (Zea mays) plants grown with exogenous phosphorus in different cropping systems.]]>47583589Ndor, E., N. Dauda, E. Abimuku, D. Azagatu and H. Anzaku,2012Vigna unguiculata (L) Walp) in Southern Guinea Savanna agroecological zone, Nigeria.]]>4254257Nirmal, D.E., R.A.J. Kumar and G. Kalloo,2001Vigna unguiculata) genotypes.]]>71598601Nkaa, F.A., O.W. Nwokeocha and O. Ihuoma,2014Vigna unguiculata).]]>97482Osodeke, V.E.,2005Vigna unguiculata) in the acid soils of South-Eastern Nigeria using sorption isotherms.]]>4135138Oti, N.N., B.U. Uzoho and C.C. Opara,200457785Padi, F.K. and K.O. Marfo,2005Vigna unguiculata L. Walp.) genotypes in Northern Ghana.]]>17986Radford, D.J.,19677171175Refay, Y.A.,20092185191Sanginga, N., O. Lyasse and B.B. Singh,2000220119128Sharma, S.C., A.K. Vyas and M.S. Shaktawat,2002Glycine max (L.) Merrill].]]>36123127Singh, A., A.L. Baoule, H.G. Ahmed, A.U. Dikko and U. Aliyu et al.,2011Vigna unguiculata (L.) Walp.) varieties in the Sudan savanna of Nigeria.]]>2313317Willey, R.W.,197932110Zahran, H.H.,1999Rhizobium-legume symbiosis and nitrogen fixation under severe conditions and in an arid climate.]]>63968989