The relationship between the absolute chlorophyll content and the relative chlorophyll content (SPAD-502 values) was determined in four fruit trees species (cupuassu, araza, lemon, and annato). The absolute chlorophyll content was determined using a spectrophotometer after pigment extraction in 80% acetone. Chlorophyll content (y) was related to SPAD values (x) as follows: y = 93.95e0.0356x, r² = 0.80 for annato; y =125.41e0.0205x, r² = 0.67 for cupuassu; y =67.58e0.0374x, r² = 0.80 for lemon and y =66.96e0.0365x, r² = 0.92 for araza.
Chlorophyll meter; Bixa orellana; Citrus limon; Eugenia stipitata; Theobroma grandiflorum
