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. 2020 Mar 6;11:259. doi: 10.3389/fpls.2020.00259

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Copyright © 2020 Tan, Zhang, Zhang, Zhou, Wang, Du, Mao, Li, Wang and Guo.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Experimental design. (V1 and V2 represent Yangmai 16 and Yangmai 17 varieties, respectively. N1, N2, N3 and N4 represent different nitrogen treatments of 0, 225 kg⋅ha^–¹,450 kg⋅ha^–¹,900 kg⋅ha^–¹, respectively. Each level had two replicates. A total of 16 plots, the area of each experimental plot was 8*10 m²).