Estimating the nitrogen content in wheat leaves by near-infrared reflectance spectroscopy
YAO Xia, TANG Shou-Peng, CAO Wei-Xing, TIAN Yong-Chao, ZHU Yan
Chin J Plant Ecol . 2011, (8): 844 -852 .  DOI: 10.3724/SP.J.1258.2011.00844