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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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.