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- W2137661106 abstract "Climatic requirements and topography restrict economic oil palm production in Ghana mainly to the Forest Oxysols and Forest Ochrosol-Oxysol Intergrades developed over granites, LowerBirrimian rocks (phyllites) and a relatively inextensive area (520 km2) in the extreme south-western part of the country of Oxysols over Tertiary sands. 8-12 years' yield records of seven 25 and 24 factorial fertilizer trials (planted in 1954-57), together with foliar analysis data taken from these trials and other experimental fields, have shown P and K deficiencies in oil palms on soils of all three geological formations. Consistent and highly significant yield responses of 30-35% to phosphate fertilizer applications were found in an experiment on soils over Tertiary sands (Aiyinasi) and in one trial on soils over granites (Assin-Foso), while both experiments also showed a significant K effect in some years. A PK interaction by which responses to potash fertilizers became highly significant (20% yield increase) in presence of added P was found in another trial on soils over granites (Pretsea). Incidental N effects, KMg and other interactions in various trials are discussed. The sharp yield decline after the 5th-6th year of production in the experiments at Aiyinasi (Tertiary sands), in contrast to more stable yield levels at Bunso (11-15 t/ha) and other stations, indicates that under conditions of light soils, and excessively high rainfall special precautions have to be taken to preserve a satisfactory fertility status of these soils. Tentative recommendations on type, rate and frequency, time and method of fertilizer application are given." @default.
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- W2137661106 date "1970-01-01" @default.
- W2137661106 modified "2023-09-23" @default.
- W2137661106 title "Nutrient status and fertilizer responses of oil palms on different soils in the forest zone of Ghana" @default.
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