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dc.contributor.authorNwoke, O.C.
dc.contributor.authorVanlauwe, Bernard
dc.contributor.authorDiels, J.
dc.contributor.authorSanginga, Nteranya
dc.contributor.authorOsonubi, O.
dc.description.abstractThe role of residue characteristics in enhancing the availability of P was investigated in a greenhouse study using two soils from the northern Guinea savanna (NGS) and four from the derived savanna (DS) zones of the West African moist savanna. Eight organic residues of varying C-to-P ratio were used and maize ( Zea mays) was grown for 7 weeks. The effect of the organic residues on P availability (measured as resin P and maize P accumulation) differed among the soils. On average, the increase in resin P, calculated as {[(soil+residue)?control]/(control)×100}, was between 8% (Davié, DS) and 355% (Danayamaka, NGS). Maize P accumulation was increased by ca. 11% in Davié and Niaouli (DS) soils and 600% in Danayamaka soil. The increase in maize total dry matter yield (DMY) ranged from 2% to 649%. Residues with C-to-P ratio >200 produced lower DMY than those with lower ratios. Residue organic P (Po) extractable with 0.2 N H2SO4 (acid-Po) accounted for 92% ( P =0.0001) of the variation in DMY in a step-wise regression with residue parameters as independent variables and mean DMY as the dependent variable. The residue Po extractable with 0.5 M NaHCO3 (HCO3-Po) correlated significantly with DMY in Danayamaka and Davié soils, and with P accumulation in Danayamaka soil. The relationships between the residue Po and DMY might imply that Po fractions in decomposing residues contribute to P availability. However, the suitability of using the Po content of organic residues to predict their agronomic value with respect to P nutrition needs further evaluation.
dc.subjectSoil Fertility
dc.subjectCrop Residues
dc.subjectFertilidad Del Suelo
dc.subjectResiduos De Cosechas
dc.titleImpact of residue characteristics on phosphorus availability in West African moist savanna soils
dc.typeJournal Article
cg.coverage.regionWest Africa
cg.isijournalISI Journal
cg.journalBiology and Fertility of Soils
cg.accessibilitystatusLimited Access

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