Fig. 1

Effects of NZVC on the content of (a) chlorophyll a, (b) chlorophyll b and (c) carotenoid pigments of DT26 soybean leaves at different stages. Values are means ± standard deviation, * Indicate significant difference at p < 0.05, respectively, between treatments and control; V1, V3, V5 and R1 were first, third, fifth trifoliate and begin at flowering stages, respectively; control - no NZVC treatment, using distilled water; CoVN - 1, 2 and CoUSA - 1, 2: Seeds were treated with 0.17 and 16.7 mg/kg seeds of Vietnamese and USA NZVCs, respectively