首页|Ammonia volatilization and Sporosarcina genus abundance in an Oxisol enriched with urea, compost and biochar
Ammonia volatilization and Sporosarcina genus abundance in an Oxisol enriched with urea, compost and biochar
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NSTL
Elsevier
? 2022Nitrogen (N) loss through ammonia (NH3) volatilization (AV) has been a major agricultural and environmental concern. AV reduction is one of the main challenges to increase N-use efficiency and decrease environmental risks. The present research aimed to evaluate the effects of the addition of urea (URE) amended with compost (COM) and biochar (BC) to soil on the biochemical process of AV and the soil-urea microsite bacterial community composition. Soil microcosm assays were performed with the addition of URE, COM, and BC and their combination URE-COM and URE-BC under incubation conditions for 28 days. AV decreased significantly only in the URE-BC, reducing the N loss by approximately 40% compared to that in the URE. The results revealed that URE hydrolysis occurred within 5 days of incubation, and urease activity increased in all treatments with urea. Urease activity decreased significantly in the URE-COM and URE-BC. Bacterial 16S rRNA gene sequencing revealed a high abundance of reads classified to Sporosarcina, suggesting that organisms belonging to this genus might play an important ecological role in the soil-urea environmental niche. There was no effect of the COM or BC on the abundance of this genus or on the bacterial community composition at 5 and 28 days. This study shows that the addition of an acidic biochar amendment with urea is the key pathway to reduce N loss through AV.
NSTL
Elsevier
