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Objectif: Cette etude a ete realisee durant deux campagnes agricoles en vue d’evaluer les effets directs et arrieres effets de feces humaines sur certaines proprietes chimiques d’un ferralsol et le rendement du mais a Lubumbashi. Methodologie et resultats: En premiere campagne, six doses de feces humaines (0, 1, 10, 20, 30 et 50 t.ha -1 ) ont ete appliquees sur deux varietes de mais (Babungo et Katanga) dans un dispositif factoriel a 3 repetitions. En seconde campagne, les memes varietes ont ete semees dans le meme dispositif, sans apport de fertilisants. Des analyses chimiques ont ete realisees sur des echantillons de sol et de feces humaines. Cette etude montre une amelioration des caracteres agronomiques en deuxieme annee, notamment l’augmentation du rendement, attribuee non seulement a la valeur fertilisante des feces humaines mais egalement a leur action sur l'amelioration des proprietes chimiques observee. L’augmentation de rendement est plus remarquable avec l’application de la faible dose (1 t.ha -1 ) soit 15 fois plus meilleure que celle observee avec la dose de 50 t.ha -1 de feces humaines et/ou avec l’application de toutes doses intermediaires. Toutefois, comparativement aux resultats d’analyse du sol de la premiere annee, une diminution de la teneur en magnesium a ete observee en deuxieme annee, montrant l’impact des exportations sans compensation sur la production vegetale. L’apport de la faible dose qui a permis d’augmenter le rendement jusqu’a 77,3% a la deuxieme campagne serait recommandable Conclusion et application des resultats: Cette etude atteste que non seulement l’application des feces humaines est directement benefique en culture de mais, mais aussi les arrieres-effets sont exploitables pour les campagnes prochaines. Il est cependant interessant de determiner jusqu’a quelle campagne les arrieres-effets sont encore exploitables. Mots cle: feces humaines, arrieres-effets, rendement, proprietes chimiques, ferralitique, mais, Lubumbashi English Title: Integration and exploitation of back effects of the human faeces to improve chemical fertility of soil and production of maize ( Zea mays L.) in Lubumbashi (D.R. Congo) English Abstract Objective: This study was carried out during two agricultural surveys to evaluate the direct effects and back effects of human faeces on certain chemical properties of a ferralsol and maize yield in Lubumbashi. Methods and results: In the first season, six doses of human faeces (0, 1, 10, 20, 30 and 50 t.ha -1 ) were applied to two varieties of maize (Babungo and Katanga) repetitions. In the second season, the same varieties were planted in the same device, without use fertilizers. Chemical analyzes were carried out on samples of human soil and faeces. This study shows an improvement in agronomic characteristics in the second year, in particular an increase in yield, attributed not only to the fertilizing value of human faeces but also to their effect on the improvement of the chemical properties observed. This increase in yield is more remarkable with the application of the low dose (1 t.ha -1 ) which is 15 times better than that observed with 50 t.ha -1 dose of human faeces faeces and / Application of any intermediate doses. However, compared to soil analysis results for the first year, a decrease in magnesium content was observed in the second year, showing the impact of exports without compensation on crop production. The contribution of the low dose which allowed increasing the yield to 77.3% in the second campaign would be recommendable Conclusion and results application: This study shows that not only the application of human faeces is directly beneficial in maize cultivation, but also the backward effects are exploitable for the forthcoming campaigns. It is, however, interesting to determinate the extent to which the backward effects are still exploitable. Keywords: human faeces, back effects, yield, chemical properties, ferralitic, maize, Lubumbashi

journal of applied biosciences

Intégration et exploitation des arrières effets des fèces humaines pour l’amélioration de la fertilité chimique du sol et de la production de la culture de maïs (&lt;i&gt;Zea mays&lt;/i&gt; L.) à Lubumbashi (R.D. Congo)