Fig. 7
Effect of dust treatments on chlorophyll content (mg g− 1 fresh weight) in cotton leaves. Ca , Cb , Ca + b and Ca/Cb represented the contents of chlorophyll a, Chlorophyll b, total chlorophyll content, and the ratio of chlorophyll a and chlorophyll b, respectively. The values shown are the mean of four replicates. Bars represent the standard error. Different letters indicate significant differences among the treatments at a 0.05% level