The direct and residual effects of different levels of chicken manure fertilization on the growth and biomass production of B. ruziziensis at the bolting were studied in West Cameroon. The objective of this study was to evaluate the effects of different levels of chicken manure fertilization on the growth and biomass production of Brachiaria ruziziensis at the bolting.
L'effet des différents niveaux de fertilisation aux fientes de poules sur la croissance et la production de biomasse de B. ruziziensis en fonction des stades phénologiques a été étudié à l'Ouest-Cameroun. Cette étude avait pour objectif d'évaluer les effets des différents niveaux de fertilisation aux fientes de poules sur la croissance et la production de biomasse de B. ruziziensis à différents stades phénologiques. Un dispositif factoriel comparant cinq doses d'azote sous forme de fientes de poules (0 ; 25 ; 50 ; 75 et 100 kg N/ha) et trois stades phénologiques (montaison, floraison et après grenaison) sur des parcelles de 6 m 2 (3 x 2 m) en quatre répétitions, soit un total de 60 parcelles expérimentales a été utilisé. Les fientes de poules ont été répandues un mois après la plantation des éclats de souches. À chaque stade phénologique, 40 plantes ont été prélevées par traitement pour les mesures des hauteurs et des diamètres. L'évaluation de la biomasse des tiges, des feuilles et de la plante entière s'est faite sur chaque parcelle en fonction du niveau de fertilisation et du stade phénologique. Les résultats obtenus ont montré que la fertilisation aux fientes de poules a augmenté de manière significative la taille, le diamètre, les biomasses des feuilles, des tiges et des plantes entières des parcelles fertilisées de B. ruziziensis par rapport à celui des parcelles témoins et proportionnellement aux quantités de fientes répandues. Les tailles, les diamètres et les biomasses des plantes entières les plus élevées ont été obtenues avec la fertilisation à la dose de 100 kg N/ha. L'étude a montré que les fientes de poules dans les conditions de cet essai ont augmenté la disponibilité en éléments nutritifs du sol et ont pu fournir la quantité d'éléments nutritifs nécessaires à la culture de B. ruziziensis.
The use of organic manures, constitute an alternative to that of polluting artificial fertilizers. In this study, the effect of various levels of hen droppings fertilization on the production of biomass, chemical composition and carrying capacity of P.
Aim:A study was conducted at the Research and Experimental Farm (REF) of the University of Dschang with the aim of evaluating the direct and residual effects of fertilization with hen droppings on the growth and biomass yield of Brachiaria ruziziensis at flowering. Methodology: A factorial design with five levels of fertilization in terms of nitrogen in hen droppings (0, 25, 50, 75 and 100 kg N/ha) on 6 m 2 (3 m x 2 m) plots in four replicates, i.e. a total of 20 Azangue et al.; JAERI, 21(1): 44-52, 2020; Article no.JAERI.54562 45 experimental plots was used. Fertilization with hen droppings was done one month after the placement of the stump chips, during the first year of cultivation (direct effects). In the second year of cultivation (residual effects), no fertilization was done. Measurements of plant heights and diameters were made on 40 plants per level of fertilization. Leaf, stem and whole-plant biomass assessments were made on all plots in relation to their fertilization levels. Results: This study shows that the direct effect of fertilization in the form of hen droppings resulted in heights and diameters significantly greater than those obtained under the residual effect of fertilization. Biomasses of whole plants and their different compartments obtained under the residual effect of fertilization were significantly higher than those obtained under the direct effect of fertilization. Under the direct and residual effect of fertilization, the heights, diameters and biomasses of the fertilized plots were greater than those of the control plots. The level of fertilization corresponding to the dose of 100 kg N/ha gave the best results. Conclusion: Fertilization with hen droppings at a dose of 100 kg N/ha would be recommended for the cultivation of B. ruziziensis over a two-year period, in order to limit the use of mineral fertilizers.
Original Research Article
Aim: A study was conducted at the Research and Experimental Farm (REF) of the University of Dschang between March 2015 and December 2016, and then at the Animal Nutrition Laboratory of the Faculty of Agronomy and Agricultural Sciences. The objective of this study was to evaluate the direct and residual effects of fertilization with hen droppings on the protein content of Brachiaria ruziziensis at different phenological stages.
Methodology: A factorial design comprising five levels of fertilization in terms of nitrogen in the form of hen droppings (0, 25, 50, 75 and 100 kg N/ha), and three phenological stages of cutting (bolting, flowering and after seed set) on 6 m2 plots (3 m x 2 m) in four replicates, i.e. a total of 60 experimental plots was used. Fertilization with hen droppings was done one month after the stump chips were grown in the first year of cultivation (direct effects). In the second year of cultivation (residual effects), no fertilization was applied. The total nitrogen content of the plant samples was determined by the Kjeldhal method and the crude protein contents were obtained by multiplying the nitrogen contents by the forage-specific coefficient of 6.25.
Results: This study showed that protein contents obtained under the direct effect were significantly higher than those obtained under the residual effect of fertilization. Fertilization at 100 kg N/ha resulted in the highest protein contents under direct and residual fertilization.
Conclusion: In view of the results obtained, fertilization with hen droppings at a dose of 100 kg N/ha would be recommended for the cultivation of B. ruziziensis in order to limit mineral fertilizer inputs and improve its protein content.
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