In this 3-year study, total phenolics, percent soluble solids, ascorbic acid, and the flavonoid aglycones
quercetin, kaempferol, and luteolin were measured in two varieties of tomato (Lycopersicon esculentum
L. cv. Ropreco and Burbank) and two varieties of bell peppers (Capsicum annuum L. cv. California
Wonder and Excalibur) grown by certified organic and conventional practices in a model system.