Abstract: The study through different concentrations of DA-6, PBO, 6-BA foliar spray on the pecan variety ‘Mahan’ 2-year-old saplings, research the impact on the growth of pecan trees to find out suitable foliar spray fertilizer and concentration. The results showed that DA-6 and 6-BA foliar application of different concentrations increased the length and thickness of branches, promote the formation of robust long pecan branches. PBO foliar application of different concentrations reduced the length of branches, increased the thickness of branches and promoted the formation of pecan stubby branches. Three different growth regulators foliar application of different concentrations all increased chlorophyll content and specific leaf weight. Contract in favor of light leaves and also increased the C/N of branches