Dissolution of rock phosphate in animal manure soil amendment and lettuce growth

Year 2016, Volume: 5 Issue: 2, 84 - 88, 02.04.2016

Kofi Agyarko Akwasi Adutwum Abunyewa Emmanuel Kwasi Asiedu Emmanuel Heva

https://doi.org/10.18393/ejss.2016.2.084-088

Cited By: 6

Abstract

A study was conducted in pots on the field to assess the effect of different quantities of poultry manure (PM), cattle manure (CM) and pig manure (PG) on the release of available phosphorus from Togo rock phosphate (RP) and lettuce growth. There were eleven (11) treatments which were: Control (soil only); 2.5g RP; 2.5g CM; 2.5gRP + 2.5g CM; 2.5gRP + 5gCM; 2.5gPM; 2.5gRP + 2.5gPM; 2.5gRP + 5gPM; 2.5gPG; 2.5gRP + 2.5gPG; 2.5gRP + 5gPG, applied per kg soil, using the Completely Randomized Design (CRD) with three replications. Available phosphorus and other parameters were assessed using standard methods. Results were statistically analyzed using the the GenStat (11^th Edition) statistical software package. The amount and type of animal manure in the amendment affected the amount of the available P released. The addition of 2.5g manure to 2.5g RP in a kg of soil significantly (P<0.05) increased available P by 4 to 7 times over the sole 2.5g RP/kg soil treatment. Doubling the amount of manure in the amendment (5g manure + 2.5g RP) almost doubled the amount of P released, with the poultry manure combinations being more significant. The amount of available P in the soil positively related to the plant height (R²=63), leaf area (R²=0.55), dry weight (R²=0.73) and the percentage P in the leaf (R²=0.88) of lettuce. The PM at 2.5gRP + 5gPM recorded the highest significant (P<0.05) values. The study has provided further basis for manure selection and quantities to be used in enhancing the release of P from rock phosphate. However, investigations need to be continued using nuclear techniques.

Keywords

Available phosphorus, manure, rock phosphate, soil amendment

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