The objective of this work was to evaluate the use of digital image analysis for the N nutritional diagnosis in common bean. Four treatments combining two levels of N and P applied to the soil were evaluated. At the pod setting stage, the Falker chlorophyll index was determined, the images of trifoliates were scanned, and leaf-N concentration was measured. In the images, a note with the software AFSoft was assigned based on the area occupied by green standards. Leaf-N content correlated to the Falker chlorophyll index and the AFSoft note, but the correlation between chlorophyll index and AFSoft note was higher.
Phaseolus vulgaris; AFSoft; phosphorus; color identification; chlorophyll index
