Influence de la fertilisation à base des déchets humains recyclés, des engrais minéraux et de leur combinaison sur le comportement de 3 variétés de maïs (Zea mays L.)

Abstract

 Objectives: The use of municipal solid waste in urban agriculture is a common practice. Recycled human waste made with little or no mineral fertilizers and their effects on crops and soil has however been poorly understood. This work was initiated to evaluate the effects of the combined inputs of recycled human waste and mineral fertilizers on the yield of maize.
Methodology and Results: The trial was installed following a factorial design with three replications. The effects of four doses of recycled human waste (0, 1.75, 3.5 and 7 t.ha^-1) were evaluated on three varieties of maize (Babungo, Unilu and Katanga). The waste was made alone or with a mineral fertilizer supplements (0 kg, 300 kgNPK+ 200 kg urea ha^-1, 150 kg NPK+100 kg urea ha^-1). The Babungo variety gave the highest yield (6.6 t.ha-1) compared to the other two varieties who gave similar yields statistically (5.3 t.ha^-1 for Katanga variety and 4.4 t.ha^-1 for Unilu). Compared to the yield obtained on plots fertilized with human waste or mineral fertilizers alone, yields were increased on plots where the two fertilizers were combined.
Conclusion and Application: The profitability of high doses of recycled human waste applied alone or combined with mineral fertilizers is comparable to that obtained with mineral fertilizers applied alone (profitable treatments). In contrast, the low dose of recycled human wastes applied only to give excellent profitability (Ration Value by Cost= 7.73). Katangese has a growing population, this leads to an increase in food needs along with high production of waste and effluents. Recycling of waste involved in environmental sanitation and the fight against poverty through increased yields.

Keywords: maize; recycled human waste; yield; mineral fertilizers