@article{article,
title = {Effect of nitrogen fertilization on nitrate nitrogen contents and - nitrate reductase activities in the plants of different winter wheat varieties},
author = {},
year = {2006},
journal = {Acta Botanica Boreali Occidentalia Sinica},
volume = {26},
number = {1},
pages = {104-109},
howpublished = "\url{https://eurekamag.com/research/004/421/004421060.php}"
}