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Article

Molecular Scale Studies of Phosphorus Speciation and Transformation in Manure Amended and Microdose Fertilized Indigenous Vegetable Production Systems of Nigeria and Republic of Benin

1
Department of Soil Science, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada
2
Department of Soil Science and Land Resources Mgt., Obafemi Awolowo University, Ile-Ife, Osun 220282, Nigeria
3
Department of Natural Resources Management, Universite de Parakou, 03 BP: 351 Parakou, Benin
*
Authors to whom correspondence should be addressed.
Soil Syst. 2020, 4(1), 5; https://doi.org/10.3390/soilsystems4010005
Received: 4 December 2019 / Revised: 2 January 2020 / Accepted: 7 January 2020 / Published: 8 January 2020
(This article belongs to the Special Issue Using Synchrotron Radiation to Perform Phosphate Speciation in Soils)
This study investigated the speciation, transformation, and availability of P during indigenous vegetable production by employing a combination of chemical and spectroscopic techniques. The study focused on sites in two ecozones of SSA, the dry savanna (lna, Republic of Benin) and rainforest (Ilesha, Nigeria). Both sites were cultivated with two indigenous vegetable species: local amaranth (Amaranthus cruentus (AC)) and African eggplant (Solanum macrocarpon (SM)). The soils were treated with 5 t/ha poultry manure and urea fertilizer at the rates of 0, 20, 40, 60, and 80 kg N/ha. Soil samples were collected before planting and after harvest. Phosphorus K-edge X-ray absorption near-edge structure (XANES) spectroscopy was used to determine P speciation in these soils. Quantitative analysis showed that adsorbed and organic P were the two dominant P species in the manure amended dry savanna (DS) soils before planting and after harvest in soils cultivated with both AC and SM, with the addition of urea (40 kg N/ha) causing an increase in the organic P form in dry savanna soils cultivated with AC. Soils of the rainforest (RF) cultivated with AC initially had large amounts of apatite P in the manure amended soils prior to planting, which was transformed to adsorbed and organic P after harvest. Urea addition to the rainforest soils shifted the dominant P species from organic P to adsorbed and apatite P, which was likely to limit P availability. Soils cultivated with SM had similar proportions of both organic and adsorbed P forms, with 40 kg N/ha addition slightly increasing the proportion of adsorbed P. View Full-Text
Keywords: Sub-Saharan Africa; phosphorus XANES; fertilizer microdosing; African leafy vegetables; synchrotron; sustainability; nutrient stewardship Sub-Saharan Africa; phosphorus XANES; fertilizer microdosing; African leafy vegetables; synchrotron; sustainability; nutrient stewardship
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MDPI and ACS Style

Olaleye, A.; Oyedele, D.; Akponikpe, P.; Kar, G.; Peak, D. Molecular Scale Studies of Phosphorus Speciation and Transformation in Manure Amended and Microdose Fertilized Indigenous Vegetable Production Systems of Nigeria and Republic of Benin. Soil Syst. 2020, 4, 5. https://doi.org/10.3390/soilsystems4010005

AMA Style

Olaleye A, Oyedele D, Akponikpe P, Kar G, Peak D. Molecular Scale Studies of Phosphorus Speciation and Transformation in Manure Amended and Microdose Fertilized Indigenous Vegetable Production Systems of Nigeria and Republic of Benin. Soil Systems. 2020; 4(1):5. https://doi.org/10.3390/soilsystems4010005

Chicago/Turabian Style

Olaleye, Abimfoluwa, Durodoluwa Oyedele, Pierre Akponikpe, Gourango Kar, and Derek Peak. 2020. "Molecular Scale Studies of Phosphorus Speciation and Transformation in Manure Amended and Microdose Fertilized Indigenous Vegetable Production Systems of Nigeria and Republic of Benin" Soil Systems 4, no. 1: 5. https://doi.org/10.3390/soilsystems4010005

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