IJAIR NAAS Score : 3.99 ,ISSN : 2319-1473
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Transformations and Distributions of the Applied and Native Phosphorus into Different Phosphorus Pools in Incubated Rustenburg and Loskop soils
- Ochwoh V. A.; Nankya E.; Claassens A. S.; C. J. Steenkamp
- A study was carried out on the transformations and distributions of applied and native soil phosphorus (P) into different pools in the two soils, a Ferric Luvisol from Rustenburg which is a high P fixing and a Ferric Acrisol from Loskop a low P fixing. They were examined after treatments with different P rates (0, 25, 50, 100, 150, and 200 mg kg-1), and incubation periods (1, 60, 120, 180, and 240 days) under laboratory conditions, at ARC – IIC in Rustenburg, South Africa. A sequential P extraction procedure was carried out on each treatment combination to determine the changes in (a) soluble and labile, (b) adsorbed, and (c) occluded and residual P pools in each soil. The results showed that while solution and labile P decreased with time of incubation, there were corresponding increases in adsorbed, occluded and residual P. Loskop soil had more marked increases in solution and labile P than the Rustenburg soil, which showed higher values for the adsorbed, occluded and residual P forms. Approximately 30 to 60 % of the added P was transformed into less labile P pools in one day and 80-90 % of the added P after 60 days of incubation. This transformation was very well marked in the higher (Rustenburg) than in the lower (Loskop) P fixing soil. A major proportion of the P transformation was to the NaOH extractable inorganic P (Pi) pool (adsorbed P pool). The added P desorbed from this pool was fairly constant (about 30 %) for the different incubation periods.
- Select Volume / Issue:
- Year:
- 2015
- Type of Publication:
- Article
- Keywords:
- P Adsorption; P Desorption; P Distribution; P Fractionation; Sequential Extraction; P Transformation
- Journal:
- IJAIR
- Volume:
- 3
- Number:
- 5
- Pages:
- 1471-1477
- Month:
- March
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