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- W2158741982 abstract "Long-term effects of mineral fertilizers (FM), organic manure (FO) and organomineral fertilizer (FOM), i.e. a mixture of FM and FO, were compared on an oxisoil over an 11 year period in fields cropped with maize (Zea mays). Fisher randomized blocks with 4 treatments and 6 replications were used. Maize yields were evaluated yearly. After 9 cropping years (1983-1992), the major soil chemical properties were measured by laboratory analysis.All treatments increased maize yields during the first period of 3-4 years (Figure 2). In the second period of 4-6 years, maize yields decreased for all treatments. FOM gave higher yields than FM over the 11 year period; the latter decreased soil organic carbon and exchangeable bases (Table 2); 50% loss of soil organic carbon was observed after 9 years of cultivation under FM, as compared to 25% loss with FMO. FM also increased soil acidity and exchangeable aluminum (Table 1). The soil results with different treatments gave a negative correlation (P < 0.01) between soil base saturation and aluminum saturation (Figure 3). A significant positive correlation (P < 0.01) was observed between soil exchangeable acidity and exchangeable aluminum (Figure 4). Soil exchangeable acidity and pH-KCI were correlated with an exponential regression (Figure 5). When soil acidity and aluminum were neutralized by liming, maize yield increased (Figure 2), indicating that soil acidification by continuous cultivation may be an important factor limiting fertilizer efficiency." @default.
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- W2158741982 date "1997-12-19" @default.
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- W2158741982 title "Effet à long terme des fumures sur le sol et les rendements du maïs au Burkina Faso" @default.
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