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采用可见光光谱扫描研究田间条件下春玉米冠层图像色彩参数和氮素营养指标之间的相关性以及简便、快捷、非接触性的作物氮素营养诊断方法。结果表明,春玉米冠层图像色彩参数与氮素营养指标间的相关性依次为6叶期>9叶期>3叶期。在6叶期,春玉米冠层图像色彩参数B、R/G、G/B、G/L、B/L、G/(R+G+B)均与氮素营养指标存在显著或极显著的线性相关关系,其中,G/(R+G+B)与氮素营养指标间的线性正相关性最高。运用可见光光谱扫描的数字图像进行东北地区春玉米氮素营养诊断是可行的,6叶期可作为春玉米氮素营养诊断的关键时期,G/(R+G+B)是春玉米氮素营养诊断的最佳冠层图像色彩参数。
The correlation between the color parameters of spring maize canopy images and nitrogen nutrition indexes under field conditions and the diagnosis method of crop nitrogen nutrition which is simple, quick and non-contact were studied by visible light spectral scanning. The results showed that the correlations between the color parameters of spring maize canopy and nitrogen nutrition indexes were 6 leaf stages> 9 leaf stages> 3 leaf stages. In the 6-leaf stage, the color parameters B, R / G, G / B, G / L, B / L and G / (R + G + B) of spring maize canopy had significant or extremely significant The linear correlation between G / (R + G + B) and nitrogen nutrition index was the highest. It is feasible to use the digital image of visible light spectrum to diagnose spring maize nitrogen nutrition in northeast China. The 6-leaf stage can be used as the key period for the diagnosis of nitrogen nutrition in spring maize. G / (R + G + B) Diagnostic best canopy image color parameters.