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ISSN : 2456-8643

Title:
INFLUENCE OF POULTRY MANURE ON PHOSPHORUS SORPTION CHARACTERISTICS IN SELECTED ALFISOLS OF BENUE STATE, NIGERIA

Authors:
Bemgba Anjembe and Ibrahim F

Abstract:
Phosphate sorption studies was carried out at the University of Agriculture Makurdi to determine the influence of poultry manure on Phosphorus sorption in some Alfisols of Benue State. Surface soil samples (0 - 20 cm) were collected from three different locations in Benue State (Daudu, TseKough and Ayange) and Poultry manure sourced from the University of Agriculture Makurdi Livestock Teaching and Research Farm. The physical and chemical properties of the soils and poultry manure were determined using standard procedures. Phosphate sorption characteristics of the soils and the influence of poultry manure was determined by equilibrating 5 g sub samples of 2 mm sieved soils from each location in two sets of 60 cm3 sample bottles. Volumes of 40 cm3 of 0.01 M CaCl2 solution containing 0, 15, 25, 40, 100, 200, 400, and 800 mg l-1P as K2HPO4 were distributed to each set of the sample bottles. Poultry Manure was added to one set at the rate of 6 t ha-1 (11.85 g) and the other set left without poultry manure and the soils incubated for 6 weeks after which the samples were equilibrated. The supernatant was filtered and P in the solution analyzed by the modified method of Murphy and Riley. The Freundlich adsorption equation was used to evaluate the adsorption data. Results indicate that the adsorption capacities of the soils were 35.58 mg kg-1 for Daudu, 35.43 mg kg-1 for TseKough and 33.12 mg kg-1 for Ayange. Addition of poultry manure however, reduced the adsorption capacities of the soils to 33.10 mg kg-1 , 34.26 mg kg-1 and 33.00 mg kg-1 representing 6.97 % decrease for Daudu soil, 3.36 % for TseKough and 0.36 % for Ayange. The phosphorus buffering capacities (PBC) of the soils ranged from 115.26 mg kg-1 at Tse-Kough, 126.33 mg kg-1 at Ayange to 130.28 mg kg-1 at Daudu. Upon addition of Poultry manure, PBC increased to 126.28 mgkg-1 ,137.85 mg kg-1 and 133.65 mg kg-1 for Tse-kough Ayange and Daudu respectively. It was concluded that addition of poultry manure would increase the phosphate buffering and reduce the adsorption capacities of the soils.

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