RESEARCH ARTICLE


Microbial, Urease Activities and Organic Matter Responses to Nitrogen Rate in Cultivated Soil



Sun Jingjing1, Zhu Mijia 1, Yang Xiaoqia2, Zhang Chi1, Yao Jun*, 1
1 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
2 College of Resources and Environment Science, Agricultural University of Hebei, Baoding, Hebei, 071001, 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, University of Science and Technology Beijing, Beijing, 100083, P.R. China; Tel:+86-10-62333305; E-mail: yaojun@ustb.edu.cn


Abstract

Nitrogen (N) fertilizer is an important field management, this paper was to investigate the responses of microbial activity measured by microcalorimetric technique, urease activity and organic matter to proper nitrogen (N) fertilizer in cultivated system in the North China Plain. The microcalorimetry results showed that microorganisms under proper N fertilizer rate got the efficient metabolism. The maximum heat production (Pmax) of microcalorimetry parameter implied that increasing the N fertilizer rate, Pmax did not increase always but firstly increased than decreased. In addition, from soil urease activity and organic matter studies, high soil urease activity due to both N fertilizer rate and growth stage and these had light influence on soil organic matter. These results suggest that only proper amount of N fertilizer rate and suitable topdressing for a good wheat-growing environment.

Keywords: Microbial activity, microcalorimetry, organic matter, urease.