Comparison of Chromometer Readings and Sensory Evaluations on Plant Color and Quality

Abstract

Plant nutrient treatment differences typically are identified through the use of plant height, leaf quantity, leaf area, and dry weight. Plant color differences may be determined quantitatively, by chromometer, or qualitatively, by sensory evaluations. Chromometer readings are easy an unbiased, however, overall plant quality must be determined by sensory evaluation. In this report, the two evaluation methods are compared. Poinsettias were grown in varying nutrient levels to flowering Chromometer readings were taken on one green leaf and one bract leaf of each flowering plant. Two sensory panels composed of commercial growers/retailers (or trained panel) and consumers, evaluated the mature plants into “Florist”, “Saleable”, or “Non-Saleable” grades. Chromometer and consumer evaluation results were comparable. The trained panel evaluations identified a more specific area of plan acceptance. The chromometer identified only color difference, whereas, the trained panel identified color and plant quality differences. The chromometer and trained panel evaluations, when used together, give complete understanding of treatment effects on quality.