R. M. TSHIBINGU et al. / Int. J. Biol. Chem. Sci. 11(2): 816-827, 2017 817 Improvement of soil degraded by inorganic fertilizer, organic matter and yield evaluation of maize (Zea mays L.) in Lomami province, Democratic Republic of Congo ABSTRACTThe study was carried out in Kabinda on a degraded soil that has received inputs from organic and mineral fertilizers in order to assess their effects on maize growth and production. The experiment was conducted during two crop years, season A and season B. Five treatments in four replicates consisted of one control (T0), four levels of fertilizer (inorganic and organic matter) supply: Entada abyssinica (T1), Tithonia diversifolia (T2) Sena floribunda (T3), and Diammonophosphate DAP (T4) were evaluated using a randomized complete block system (RCBD). The observations had related to the parameters of growth and production that underwent the analysis of variance (ANOVA) at 5% level of significance. The results obtained indicate that maize responded positively in the growth stage under the effect of fertilizing indiscriminately of their nature (p <0.05) compared with the control in the two growing seasons. The fertilizers accelerated vegetative growth and increased the yield from 40 to 80% of maize compared with the control of the cropping season indiscriminately. T. diversifolia gave higher seed yield 1398.1 kg / ha and control had lower seed yield 885.5 kg / ha in season A whereas in season B, DAP produced higher seed yield 3332.8 kg / ha and the control plot gave lower seed yield 1825.kg / ha. These organic fertilizers based on E. Abyssinica, T. diversifolia, and S. floribunda were noted for their high yield scores in season A and a non-significant difference in inorganic treatment in season B. These species can be considered as significant sources of soil fertilizer to improve maize yield.
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