Abstract: Surface feature spectro-comparator was used to probe the effect of spectral absorption feature parameters on water content of the wheat leaves at NIR. The results showed that the water content of the wheat leaves decreased when the spectral reflectance was between 1.65 μm and 1.85 μm. The wave-band lies in the atmosphere window, so was seldom interfered by the water in the atmosphere. Thus it could be regarded as the index of the aviation or satellite remote sensing. The linear correlation curve and the regression equation between water content of wheat leaves and absorption depth or area of the spectrum were obtained on the basis of a great deal of data observed. Thus a remote sensing method of using spectral reflectance was used to diagnose the water status of the wheat leaves was obtained.

Key words: Wheat, Water content of the leaves, Spectral reflectance, Remote sensing