Correlation between chlorophyll content and nitrogen levels applied on bean leavesTwo experiments were carried out at greenhouse conditions in nutrient solution and soil, using six nitrogen levels (28, 56, 84, 112, 140 and 168 mg/L of N) to adjust the chlorophyll meter readings (Minolta SPAD-501) to the nitrogen levels in the bean leaves. Chlorophyll content, leaf area, fresh and dry matter of leaves, N, Ca, Mg and S leaf concentration, and grain yield were evaluated. Good correlations were obtained between chlorophyll meter readings and nitrogen application rates (R = 0.86) and leaf nitrogen concentration (R = 0.75). These results indicate that the chlorophyll meter is a useful device to detect nitrogen deficiency in bean plants.
chlorophyll; nitrogen; beans; chlorophyll meter