The effects of spraying plant growth regulator under drought stress on seedling growth and physiological and biochemical indexes of soybean were studied based on pot experiment. The results indicated that the plant growth regulator could increase plant height

main root length

lateral root number

root/shoot ratio

chlorophyll content

proline content and the activity of peroxydase(POD)

and improve the ability of drought-resistance of soybean seedlings. Among the 4 plant growth regulators used in this experiment

PSB was the best effective for the drought-resistance of soybean seedlings.