RESEARCH ARTICLE


Microorganism Quantity and Enzyme Activities in Wheat Field Subjected to Different Nitrogen Fertilizer Rate



Sun Jingjing, Ma Jiaheng, Wu Xiaoying, Wang Cheng, Yao Jun*
School of Civil & Environmental Engineering and National “International Cooperation Based on Environment and Energy” and Key Laboratory of “Metal and Mine Efficiently Exploiting and Safety” Ministry of Education, University of Science and Technology Beijing, Beijing 100083, P.R. China


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Creative Commons License
© 2015 Jingjing et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the School of Civil & Environmental Engineering and National “International Cooperation Based on Environment and Energy” and Key Laboratory of “Metal and Mine Efficiently Exploiting and Safety” Ministry of Education, University of Science and Technology Beijing, Beijing 100083, P.R. China; Tel: +86-10-62333305; E-mail: sunjing0314@126.com


Abstract

Field experiments are described involving nitrogen fertilizer in the wheat field to analyze its effect on microbial quantity and enzyme activity. The results showed that 250 kg N hm-2 applied in the wheat field (1) can increase bacteria, fungi and the quantity of actinomycetes by 39.9%, 56.7% and 70.5% compared to 0 kg N hm-2. (2) Similarly, the activities of soil urease, catalase and FDA exhibited 60.8%, 18.3% and 49.1% improved variation compared to 0 kg N hm-2, respectively. (3) Moreover, Shannon-Wiener diversity index (H) and Evenness index (E) reached the peak (H=0.37, E=0.33). Correlation analysis of microbial quantity with enzyme activity indicated that they were related to each other. These findings suggested that soil microbial quantity and enzyme activity were significantly influenced by nitrogen fertilizer and the application of 250 kg N hm-2 in the wheat field was observed to be the best.

Keywords: Enzyme activity, microorganism quantità, nitrogen fertilizer, wheat field.