Authors: LouisB Jugnia Yaseen Mottiar Euphrasie Djuikom Alexandre R Cabral Charles W Greer
Publish Date: 2011/09/06
Volume: 93, Issue: 6, Pages: 2633-2643
Abstract
The effects of compost nitrogen salts and nitrogen–phosphorous–potassium NPK fertilizers on the methane oxidation potential MOP of landfill cover soil at various temperatures were assessed For this we used batch assays conducted at 5°C 15°C and 25°C with microcosms containing landfill cover soil slurries amended with these elements Results indicated variable impacts dependent on the type of amendment and the incubation temperature For a given incubation temperature MOP varied from one compost to another and with the amount of compost added except for the shrimp/peat compost With this latter compost independent of the amount MOP values remained similar and were significantly higher than those obtained with other composts Amendment with most of the tested nitrogen salts led to similar improvements in methanotrophic activity except for urea MOP with NPK fertilizer addition was amongst the highest in this study the minimum value obtained with NPK 20–0–20 suggested the importance of P for methanotrophs MOP generally increased with temperature and nutrient limitation became less important at higher temperatures Overall at each of the three temperatures tested MOP with NPK fertilizer amendments provided the best results and was comparable to those observed with the addition of the shrimp/peat compost The results of this study provide the first evidence of the following 1 compost addition to improve methanotrophic activity in a landfill cover soil should consider the amount and type of compost used and 2 the importance of using NPK fertilizers rather than nitrogen salts in enhancing this activity primarily at low temperatures One can also consider the potential beneficial impact of adding these elements to enhance plant growth which is an advantage for MOPWe gratefully acknowledge the financial support by the National Research Council Canada through the Biotechnology Research Institute including a summer research studentship for YM Also ED was supported by the fellowship program “Professeur Invité du Sud” from “lAgence Universitaire de la Francophonie” sponsored by ARC We also acknowledge the contribution of Waste Management and NSERC Canada under the Cooperative Research and Development grant CRD 37988508
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