期刊
JOURNAL OF APPLIED REMOTE SENSING
卷 2, 期 -, 页码 -出版社
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
DOI: 10.1117/1.2968954
关键词
winter wheat (Triticum aestivum L); canopy reflectance; nitrogen reflectance index (NRI); grain crude protein content; ASTER image
资金
- National High Tech R&D Program of China [2006AA10A302, 2007AA10Z201, 2006AA10Z203]
- National Natural Science Foundation of China [40701119]
- Beijing Natural Science Foundation [6062019]
- State Key Laboratory of Remote Sensing Science
- Beijing Normal University and Institute of Remote Sensing Applications of Chinese Academy of Sciences
- Ministry of Agriculture [2006-G63]
The advanced technology in site-specific and spaceborne determination of grain crude protein content (CP) by remote sensing can help optimize the strategies for buyers in aiding purchasing decisions, and help farmers to maximize the grain output by adjusting field nitrogen (N) fertilizer inputs. We performed field experiments to study the relationship between grain quality indicators and foliar nitrogen concentration (FNC). FNC at anthesis stage was significantly correlated with CP, while spectral vegetation index was significantly correlated to FNC. Based on the relationships among nitrogen reflectance index (NRI), FNC and CP, a model for CP prediction was developed. NRI was able to evaluate FNC with a higher coefficient of determination of R-2=0.7302 in Experiment A. The relationship between laboratory measured and remotely sensed FNC had a coefficient of determination of R-2=0.7279 in Experiment B. The method developed in this study could contribute towards developing optimal procedures for evaluating wheat grain quality by in situ canopy-reflected spectrum and ASTER image at anthesis stage. CP derived from both in situ spectrum and the ASTER image exhibited high accuracy and the precision in Experiment C. The RMSE were 0.893 % for in situ spectrum model and 1.654 % for ASTER image model, and the R-2 were 0.7661 and 0.7194 for both, respectively. It is thus feasible to forecast grain quality by NRI derived from in situ canopy-reflected spectrum and ASTER image. Our results indicated that the inversion of FNC and the evaluation of CP by NRI were surprisingly good.
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