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Demand-Driven Technologies for Sustainable Maize ... - IITA

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123Effect of organic and inorganic nutrientsources on extra-early maize in theNigerian savannaC.K. Daudu 1 , E. Uyovbisere 2 , E.N.O. Iwua<strong>for</strong> 2 , J.J. Owonubi 2 and J.E. Onyibe 11Crop and Forestry Programme, NAERLS2Department of Soil Science, IAR, Ahmadu Bello University, Zaria, NigeriaAbstractField studies were undertaken to evaluate the response of extra- earlyvarieties of maize (Zea mays L.) to different sources of organic amendmentsalone and in combination with varying rates of inorganic fertilizer in analfi sol of the Nigerian savanna <strong>for</strong> three years. The treatments consistedof factorial combinations of 5 different organic material sources (cowdung, maize stover, Leucaena leucocephala prunings, Mucuna pruriensvines, applied at 5 t ha -1 and no amendment control) and four rates ofchemical fertilizer (0, 25, 50 and 100% recommended rates). Organicand inorganic fertilizers as well as their interactions affected maizegrowth and yield. Yield differences were signifi cant at each incrementallevel of inorganic fertilization. The relative effects of applications of theorganic materials were in the order: cow-dung> M. pruriens vines>L.leucocephala prunings>maize stover respectively. The results showedthat, under intensive systems, a combination of 5 t cow dung ha -1and recommended optimum inorganic fertilizer rate could producemaximum yields. It was concluded that, in low input and nutrientdefi cient systems, application of cow dung or M. pruriens vines couldreduce the inorganic fertilizer requirement of the maize crop.RésuméDes études au champ ont été conduites afi n d’évaluer la réponse devariétés extra-précoces de maïs aux différentes sources d’amendementsorganiques spécifi ques et en combinaison avec des taux variés d’engraisinorganiques dans un alfi sol dans la savane nigériane pendant troisannées. Les traitements ont consisté en des combinaisons factorielles de5 différentes sources de matières organiques (fumure de vache, résidusde maïs, élagages de L. leucocephala, tiges de M. pruriens et témoins)appliquées à deux taux (0 et 5 tonnes/ha). Le traitement d’engraischimique était appliqué à quatre taux (0, 25, 50 et 100% de la doserecommendée). Les paramètres de croissance et de rendement du maïsont été affectés par les applications individuelles d’engrais inorganiqueset organiques et à leurs interactions. Les différences de rendement maïsétaient signifi catives pour chaque augmentation du niveau d’engrais

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