Guided PhotosynQ Spad vs. Minolta


The industry standard for collecting quick chlorophyll measurements is Minolta's SPAD meter. We are comparing our MultispeQ to Minolta to see how similar we are to the standard.

Our first projects comparing the MultispeQ to Minolta had mediocre linear regression outputs (r2 around 0.5) for most crops excluding young apple trees. Young apple leaves tended to have more consistent color throughout the leaves. In other plants, like corn, there is a visual color difference within the same leaf. Leaves that have high venation can produce different SPAD readings in a small area, and since the area for measurements differs between devices, this experiment creates a standard area.

We are testing the PQ SPAD vs. Minolta SPAD using guided sleeves to ensure similar sample area's. The MultispeQ's area of measurement is much larger than the Minolta SPAD, so we want to test if a single MultispeQ PQ SPAD measurement is as accurate as multiple Minolta measurements.


Chlorophyll content (SPAD) III

REQUIREMENTS: Firmware v0.41 or higher. Measures transmission at 940nm and 650nm in order to determine the 'greenness' of a leaf, an indicator of chlorophyll content and nitrogen content. The 940 is used to account for leaf thickness. Improvements over Chlorophyll content (SPAD): - performs 3 different spads at 3 intensities for thin and thick ...


  1. Average Minolta Value (Short Answer)
  2. Crop (Short Answer)
  3. Location on plant (Multiple Choice)



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