What is the Plant Cell Density Index (PCD)?
PCD, also known as the Simple Ratio Index, is a well-known remote sensing index used to characterise the relative health and biomass status of vegetation. Healthy, vigorous vine biomass will exhibit a strong near infrared (NIR) reflectance and a very low red (R) reflectance due to chlorophyll absorption:
Plant Cell Density = (NIR 780nm / Red 675nm)
What does this mean in the vineyard?
|Low PCD||High PCD|
|Leaf and vine characterstics||Lower vigour, greater plant stress, leaf senescence, thinner canopy||Higher vigour, new shoots, green healthy leaves, fuller canopy|
|Fruit characteristics||Potentially lower yield and higher quality fruit composition, even berry ripeness||Potentially higher yield and lower fruit composition, uneven berry ripeness|
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