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Danso I.,Oil Palm Research Institute | Nuertey B.N.,Oil Palm Research Institute | Danso F.,Oil Palm Research Institute | Okyere S.A.,Oil Palm Research Institute | And 4 more authors.
Research Journal of Applied Sciences, Engineering and Technology | Year: 2014

The aim of the study was to find out the economic suitability of using phosphate rock under matured oil palm in the semi-deciduous forest zone in Ghana. The study was conducted between 2002 and 2007 at the Oil Palm Research Institute at Kusi, Ghana. The oil palm trees selected were 8 year old tenera (DXP ex OPRI). Each plot measured 17.6 m×17.6 m. There were four treatments, consisting of: 1). TSP-control: 222 kg of AS+222 kg of TSP+296 kg of MOP/ha/yr- OPRI fertilizer recommendation; 2). PR1-PR 715 kg+222 kg of AS+296 kg of MOP/ha-Yr 1. PR 358 kg+222 kg of AS+296 kg of MOP/ha-Yr 2. PR358 kg+222 kg of AS+296 kg of MOP/ha-Yr 3; 3). PR2-PR 1428 kg+222 kg of AS+296 kg of MOP/ha applied once in every 5 years; 4). PR3- PR 142.85 kg/ha+222 kg AS/ha+296 kg of MOP/ha applied twice in every 5 years. The cost-benefit analysis was carried out by comparing production cost and revenue for triple super phosphate and phosphate rock regimes. The cost benefit ratio in a declining order were: 3.4, 3.1, 2.9 and 2.4 for PR3, PR2, PR1 and TSP, respectively. The study has clearly shown that, economically it is sound to use PR under matured oil palm. © Maxwell Scientific Organization, 2014.

Issaka R.N.,Academy Post Office | Senayah J.K.,Academy Post Office | Andoh-Mensah E.,Oil Palm Research Institute | Ennin S.A.,Crops Research Institute
West African Journal of Applied Ecology | Year: 2012

Coconut cultivation is mostly practiced in the Western and Central regions of Ghana. Information on the fertility status of the soils on which coconuts are grown and possible fertilizer recommendation is not common. Since coconut yield is generally related to the fertility status of the soil, a study was conducted to evaluate the fertility status of soils supporting coconut in the Western and Central regions. The soils were sampled at three depths, 0-20 cm, 20-40 cm and 40-60 cm at 21 different sites. The soil physical properties do not constitute any major limitation to good coconut growth and yield. Evaluation of the top soil showed that the mean top soil pH was very strongly acidic (4.1 ± 0.12) and far below the acceptable limits for good coconut yield. Mean exchangeable acidity [0.57 ± 0.06 cmol(+)kg-1] was relatively high while exchangeable basic cations (Ca, Mg and K) were generally very low. Mean effective cation exchange capacity (ECEC) of 3.1 ± 0.48 cmol (+) kg-1was very low. Mean organic matter status 22.1 ± 1.9 gkg-1 was moderate. Mean available phosphorus of 2.8 ± 0.56 mgkg-1 was very low and one of the major nutrients that will affect coconut yield. Except for soil pH, nutrient levels generally showed a decreasing trend in the order top soil > subsoil > sub-subsoil. The evaluation showed that the soils suffer from multi-nutrient deficiency. Nutrient levels of the soils are low to very low, and will not support good coconut growth and yield. Liming to improve the exchangeable basic cations and pH of the soils is recommended. Use of rock phosphate is also recommended for raising the levels of both phosphorus and some basic cations. Amendments and fertilizers with high K content must also be considered.

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