RESUMEN
With strawberry ' French 3' (Fragaria x ananassa Duch cv. French 3) as test material, this paper studied the effects of foliar spraying DA-6 at the rates of 10, 20 and 30 mg x L(-1) in late autumn on its seedlings net photosynthetic rate, metabolism of reactive oxygen species, and plant growth. Compared with the control, foliar spraying DA-6 of 20 and 30 mg x L(-1) increased the net photosynthetic rate, chlorophyll a and b contents, and SOD and CAT activities significantly, and decreased the reactive oxygen and MDA contents. Moreover, foliar spraying DA-6 of 20 and 30 mg x L(-1) increased the average dry weight per leaf, and the dry mass of shoot and root significantly. The ratio of root to shoot after spraying DA-6 of 20 and 30 mg x L(-1) was 29.9% and 29.3% higher than the control, respectively. Foliar spraying appropriate concentration of DA-6 in late autumn could improve the plant growth of strawberry seedlings.