Gao, Xiaoyu
Huo, Zailin
Qu, Zhongyi
Xu, Xu
Huang, Guanhua
Steenhuis, Tammo S.
Article History
Received: 4 October 2016
Accepted: 19 January 2017
First Online: 21 February 2017
Competing interests
: The authors declare no competing financial interests.