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Effect of different levels of nitrogen on physiological characteristics of
flag leaves and grain yield of wheat
WANG He-zheng, ZHANG Jun, WU Jin-zhi, XU Guo-wei, CHEN Ming-can, FU Guo-zhan, LI You-jun
Acta Prataculturae Sinica . 2013, (4): 69 -75 .  DOI: 10.11686/cyxb20130408