Abstract:More researches were carried out to investigate the application of spectral technology on crop nutrition diagnosis. However, the complex conditions in the field results in the uncertainty of spectrum. In this paper, the influence of foliar dust on spectral of the crop beside the nation road was studied, the differences of the raw spectral reflectance and first derivative spectral reflectance between the foliar with dust and the foliar washed with deionised water were analyzed, nitrogen prediction models were built on the disturbance of foliar dust. Result showed that the dust foliar spectral reflectance increased in the visible light (350~720 nm) and shortwave infrared (SWIR) (1 360~2 500 nm) regions whereas the spectral reflectance in the near infrared (NIR) (720~1 360 nm) wavelength regions decreased. There were no change rules for blue edge position, yellow edge position, red edge position, blue edge slope and yellow edge slope on the effect of foliar dust, but red edge slope, blue edge area, yellow edge area, red edge area decreased. Determinate coefficient(R2) of nitrogen prediction models reduced in the condition of foliar dust. The primary research work about the condition of foliar dust was studied which helps to provide foundation for evaluating effect of foliar dust and proposing foliar dust modification model in the future.
[1] QIN Xia, WANG Shao-hua, XUE Li-hong(覃 夏, 王绍华, 薛利红). Scientia Agricultura Sinica(中国农业科学), 2011, 44(4): 691. [2] Hirano T, Kiyota M, Aiga I. Environmental Pollution, 1995, 89(3): 255. [3] Liew O W, Chong P C J, Li B Q, et al. Sensors, 2008, 8: 3205. [4] WANG Ji-hua, ZHAO Chun-jiang, GUO Xiao-wei, et al(王纪华, 赵春江, 郭晓维, 等). Scientia Agricultura Sinica(中国农业科学), 2001, 34(1): 1. [5] XIAO Shen-liang, CHEN Zhong-xin(肖伸亮, 陈仲新). Chinese Agricultural Science Bulletin(中国农学通报), 2007, 23(4): 410. [6] DING Jian-li, SHEN Tao, ZHU Qi-jiang, et al(丁建丽, 沈 涛, 朱启疆, 等). Remote Sensing Information(遥感信息), 2005, 3: 27. [7] PANG Bo, ZHANG Yin-long, WANG Dan(庞 博, 张银龙, 王 丹). Ecology and Environmental Sciences(生态环境学报), 2009, 18(4): 1312. [8] Gupta A, Kumar R, Kumari K M, et al. Chemosphere, 2004, 55: 1097. [9] JU Chang-hua, TIAN Yong-chao, ZHU Yan, et al(鞠昌华,田永超,朱 艳,等). Journal of Plant Ecology(植物生态学报), 2008, 32(3): 664. [10] YI Qiu-xiang, HUANG Jing-feng, WANG Xiu-zhen, et al(易秋香, 黄敬峰, 王秀珍, 等). Transactions of the Chinese Society of Agricultural Engineering(农业工程学报), 2006, 22(9): 138. [11] Blacker T M, Schepers J S, Varvel G E. Agronomy Journal, 1994, 86: 934. [12] TANG Yan-lin, WANG Xiu-zhen, WANG Ren-chao(唐延林, 王秀珍, 王人潮). Journal of Mountain Agriculture and Biology(山地农业生物学报), 2003, 22(3): 189. [13] Sims D A, Gamon J A. Remote Sensing of Environment, 2002, 81: 337. [14] Zhao D, Reddy K R, Kakani V G, et al. Agronomy Journal, 2005, 97: 89. [15] Gamon J A, Peňuelas J, Field C B. Remote Sensing Environment,1992, 41:35.