Assessing petiole iron content in Vitis vinifera 'Chardonnay' using reflectance based hyperspectral indices
2013
Gonzalez-Flor, C. | Gorchs, G. | Serrano, L.
Iron chlorosis is a relevant nutritional disorder in vineyards grown in the Mediterranean area, which affects both berry yield and quality. Reflectance based remote sensing techniques might provide a valuable tool to characterize iron chlorosis incidence through the assessment of chlorophyll content. The study was conducted in ten vineyards (Vitis vinifera ‘Chardonnay’) to test the capability of reflectance based chlorophyll indices at assessing petiole iron content. Significant relationships emerged between petiole Fe concentration and reflectance based chlorophyll indices. Among the chlorophyll indices tested, the modified Normalized Difference 705 (mND(705)) and the modified Simple Ratio 705 (mSR(705)) were found to be significantly related (p<0.01) to petiole iron concentration with r2 = 0.82 and r2 = 0.72, respectively. In addition, the Chlorophyll Normalized Difference Index was also significantly related to petiole iron concentration although in a lesser extent (r2 = 0.53, p<0.05). The results obtained suggest that narrow-band chlorophyll indices derived from canopy reflectance might provide a useful tool to assess petiole iron concentration in ‘Chardonnay’ vineyards.
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