Our stress monitoring project for strawberries is based on the observation that different objects reflect and absorb light in different ways. Stressed and healthy plants have different photosynthetic activity and interact with light in very specific ways.
By looking beyond the visible spectrum with a multispectral camera we can measure light reflectance variations and identify specific fingerprints of plant stress before they are visible to the human eye.
We are looking at specific parameters such as chlorophyl levels or NDVI values (Normalized Difference Vegetation Index).
Here you can see the NDVI map of a strawberry greenhouse.
NDVI provides clear and easy to interpret information on plant vigour. Stressed plants have a lower NDVI value and are represented in yellow/orange shades.
With NDVI, it is possible to quickly identity in-field variability at a given moment. It can also be used to compare images over time to identify significant changes in plant health status.
In this animated picture you can see the evolution of the photosynthetic activity of a strawberry field over a one hour period. The crops in green have the highest levels of activity while the dark-red ones are less active due to a lower sun exposure.
With these information, farmers can provide an early, local and adapted response. Which will allow them to use less resources, lower their costs, save time and eventually prevent yield losses.
Do you want to learn more about the benefits of multispectral imaging for early plant stress monitoring in greenhouses? Have a look at our product presentation here: GreenspectIR