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Direct Research Journals
Vol.5 (2), pp. 88-95, February 2017
ISSN: 2354-4147: International Standard Journal Number (ISJN) e-ISJN: A4372-2604

Effect of algae on phosphorus sorption characteristics of an ultisol of Southeastern Nigeria
Article Number: DRJA22560476
DOI:

Original Research Article


Azu, Donatus, E. O.1 Osodeke, V. E2. and Nwanja, O. U3.


1Department of Horticulture and Landscape Technology, Akanu Ibiam Federal Polytechnic, Unwana, Afikpo Ebonyi State,Nigeria.

2Department of Soil Science and Meteorology, Michael Okpara University of Agriculture, Umudike Abia State. Nigeria.

3Department of Agricultural Technology, Akanu Ibiam Federal Polytechnic, Unwana, Afikpo Ebonyi State. Nigeria.

*Corresponding author E-mail:  donblessed01@gmail.com.


date Received: December 2, 2016     date Accepted: December 30, 2016     date Published: January 21, 2017

Abstract

A pot experiment was carried out in a Green House at Michael Okpara University of Agriculture, Umudike, to investigate the phosphorus sorption characteristic of soil treated with algae. The experiment was a 2×2 factorial in completely randomized design and soil samples were collected from 0-20 cm depth of a sandy-loam soil from the University Research farm. The treatment comprised of five rates (0, 1, 2, 3 and 4 t/ha) algae and each treatment replicated three times giving a total of fifteen observational units. The data generated from the sorption studies were fitted into Freundlich model and from P-sorption isotherms, the Standard Phosphorus Requirement (SPR) of these soils were calibrated. Results showed that application of algae to the soils increased the soils available phosphorus which in-turn influenced the SPR of these soils. The SPR values ranged from 90 mg/kg in the control to 10 mg/kg in the 4 t/ha algae treated soil which showed an inverse relationship between the SPR and the rate of application of algae. Results also showed that, the P-sorption capacity, the affinity coefficient (bonding energy) and the maximum buffering capacity (MBC) were lowest in the 4 t/ha algae treated soil.  It is therefore recommended that to satisfy the phosphorus need of both soil components and plant nutrition, 4 t/ha algae should be applied in ultisols of southeastern Nigeria for sustainable crop production.


Key words: Phosphorus sorption isotherm, Algae, P-sorption energy, maximum buffering capacity