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• W2110836411 abstract "A review of literature shows that work on non-conventional phosphate fertilisers has been done exclusively on sedimentary phosphate rocks. The potential of using novel phosphate fertiliser materials derived from unreactive igneous Dorowa (Zimbabwe) phosphate rock was investigated in a greenhouse experiment. Three phosphate fertiliser materials; (1) finely ground (0.150-mm screen) Dorowa phosphate rock (DPR), (2) partially acidulated Dorowa phosphate rock (PADPR), and (3) a compacted mixture of DPR + triple superphosphate + urea + potassium chloride (DTUK) with half of P from DPR and half from triple superphosphate (TSP) were made from Dorowa rock and their relative agronomic effectiveness compared with that of single superphosphate (SSP) on an acid Hartsells silt loam (pH 4.8) with maize (Zea mays L.) as the indicator crop. Direct application of DPR was found to be ineffective in increasing phosphorus (P) uptake and dry matter yield of maize. The relative agronomic effectiveness of DPR partially acidulated with 50% of the sulfuric acid (H2SO4) required for complete acidulation, in increasing P uptake and dry matter yield was 60% and 75%, respectively. The compacted fertiliser product, DTUK, was equally effective in increasing P uptake and dry matter yield as SSP. Key Words: Acidulation, agronomic effectiveness, fertiliser compaction, Zea mays Résumé Une revue de la littérature montre que le travail sur engrais phosphatiques non conventionels a été fait exclusivement sur les roches (substances) phosphate sedimentaires. Le potentiel d'utilisation des nouveaux matériaux fertilisants phosphatiques dérivés de réactifs éruptifs Dorowa (Zimbabwe) ont été examiné dans une serre experimentale. Trois matériaux fertilisants phosphate ; finement moulu (0, 150 mm tamis) Dorowa roche phosphatique (DRP), et 2) DRP acidulé (DRPA), et 3) un melange compacte de DRP et le triple superphosphate+ urée+ chloride de potassium (DTUK) avec la moitié de P du DRP et la moitié de triple superphosphate (TSP) était faite à partir de la roche Dorowa et leur efficacité agronomique relatives comparées avec celle du superphosphate (SSP) sur un depôt d'acide Hartsells terreau (BH 4, 8) avec le maïs (Zea mays L.) comme indicateur de plante. Une application directe du DRP était trouvée être non effective dans la croissance de l'assimilation du phosphore (P) et production de matière sèche de maïs. L'efficacité relative agronomique du DRP partiellement acidulé, avec 50%d'acide sulfurique (H2SO4) demandée pour une complète acidulation, pour l'accroissement de l'assimilation et la production de matière sèche de P était respectivement de 60% et 75%. Le produit fertilisant compacté DTUK était également effectif dans accroissement de l'assimilation et la production de matière sèche de P comme le SSP. Mots Clés: Acidulation, efficacité agronomique, compaction de fertilisants, Zea mays (Af Crop Sci J 2003 Vol 11 No 3 pp235-243)" @default.
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• W2110836411 date "2004-01-08" @default.
• W2110836411 modified "2023-10-01" @default.
• W2110836411 title "SHORT COMMUNICATION: Agronomic effectiveness of novel phosphate fertilisers derived from an igneous Zimbabwe phosphate rock" @default.
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• W2110836411 doi "https://doi.org/10.4314/acsj.v11i3.27573" @default.
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