Soil Phosphorus Dynamics of Sweet Potato-Based Cropping System in a Rainforest Region of Nigeria
2019
Kareem, I. (University of Ilorin, Ilorin (Nigeria) | Akinrinde, E. A. (University of Ibadan, Ibadan, (Nigeria) | Oladosu, Y. (Universiti Putra Malaysia, Serdang, Selangor (Malaysia) | Abdulmaliq, S. Y. (Ibrahim Badamasi Babangida University, Lapai (Nigeria) | Eifediyi, E. k. (University of Ilorin, Ilorin (Nigeria) | Kareem, S. A. Federal College of Education (Special), Oyo (Nigeria)
To guard against soil phosphorus (P) toxicity in tuber production and have optimum tuber yield at lesser cost of P-fertilization, better understanding of the dynamics of phosphorus release in sandy loamy soil is inevitable. Therefore, this work was carried out to investigate the trend of P-release from time of application to its optimum release and its effect on sweet potato growth and tuber production. To achieve this, a 5-week incubation study under laboratory conditions was carried out to study P-release dynamics using different P sources. Similar experiment was conducted on the field using the same P sources and application rate to monitor the influence P-release rate on sweet potato production. Data on number of leaves, vine length, tuber yield, soil extractable phosphorus and phosphorus uptake of the plants were taken. Relationships between P-uptake and tuber yield, number of leaves, vine length were also established. It was found that the trend of phosphorus release was a sigmoid shape. Leaf production and vine length were improved by P-application, while yield was suppressed. It is recommended that P-fertilizer should not be applied to the soil at short intervals to avoid nutrient toxicity.
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