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- Title
Nitrogen fertilizer is a key factor affecting the soil chemical and microbial communities in a Mollisol.
- Authors
Du, Yan; Wang, Tianye; Wang, Chengyu; Anane, Paul-Simon; Liu, Shuxia; Paz-Ferreiro, Jorge
- Abstract
Microbial communities drive geochemical cycles in soils. Relatively few studies have assessed the long-term impacts of different types of soil amendments under field conditions in long-term experiments. The response of soil microbial organisms in a Mollisol cultivated with maize for 35 years was examined. Treatments involved the use of N, P, and K fertilizers and two doses of straw residue in isolation or combined. Real-time PCR and Illumina MiSeq sequencing methods were used to characterize the microbial community. The results showed that addition of nitrogen fertilizers decreased soil pH, but this was mitigated when a high dose of straw was also incorporated. Long-term application of inorganic fertilizers was able to alter the abundance of functional soil microbial population. Application of inorganic N fertilizer resulted in distinctive changes on N-cycle microorganisms. Phosphate-solubilizing functional genes abundance was lower in plots with no phosphate fertilizer. Sequencing analysis showed that the presence or absence of N in the fertilizer mix is a key factor affecting bacterial community diversity of agricultural soil, and pH, total organic C, and total N show a high correlation with bacterial community composition. Nitrogen addition increased the N concentration in the soil, which could cause changes in the soil pH and change the soil bacterial community. Our findings proved that interaction of N fertilizer with other fertilizers can affect microbial communities.
- Subjects
NITROGEN fertilizers; MICROBIAL communities; SOIL amendments; PHOSPHATE fertilizers; SOILS; MOLLISOLS; FERTILIZER application
- Publication
Canadian Journal of Microbiology, 2019, Vol 65, Issue 7, p510
- ISSN
0008-4166
- Publication type
Article
- DOI
10.1139/cjm-2018-0683