Relationship between chlorophyll content and soil plant analytical development values in two cultivars of fig (Ficus carica L.) as brassinolide effect at an open field

Relationship between chlorophyll and relative chlorophyll values obtained using soil plant analytical development (SPAD)-502 meter after brassinolide treatment were determined in two varieties of fig (Fiscus carica L.) at an open field conditions using fresh weight basis. The experiment was arranged as split plot randomized complete block design (SRCBD) with four replications, and each experimental unit containing three plants. A different fig sample was considered as the main plot and brassinolide concentrations as sub-plots. There were four plants as destructive samples observed monthly for each replication. The correlation of SPAD value and the content of chlorophyll a, chlorophyll b and total chlorophyll content were significantly correlated in fig leaves. At IBT variety, the optimal mathematic function for SPAD value and chlorophyll a, chlorophyll b and total chlorophyll were Y=30.209e−0.081x (r=0.6623), Y=388.42x−1.676 (r=0.3145), and Y=29.738e−0.072x (r=0.5380) respectively. At MD variety, the optimal function models were Y=7.4524e−0.032x (r=0.5318) for chlorophyll a, y=-0.0025x2+0.1268x+0.2896 (r=0.3407) for chlorophyll b and Y=-0.0052x2+0.1961x+3.1882 (r=0.5129) for total chlorophyll. All these data proved SPAD-502 can be an effective tool used for rapid and nondestructive estimation of leaf chlorophyll content in fig.