Intercomparison of Unmanned Aerial Vehicle and Ground-Based Narrow Band Spectrometers Applied to Crop Trait Monitoring in Organic Potato Production.

After that, leaf area index changed very little, except on the last acquisition when considerable lower leaf area levels were observed in comparison with the previous dates, in particular for plots with mixed varieties, while leaf chlorophyll content continued to decrease, resulting in a positive trend between these traits in this period, as can be observed in Figure 3 as well.

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A negative trend occurred between leaf chlorophyll and leaf area index ( Figure 4 a) for observations corresponding to the first two acquisition dates (from 43 to 62 DAP).

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