Effects of the Extract of the Fruit of Melia azedarach by Water on Maize Root and Seedling Growth

The 100g fruit of Melia azedarach was dried,curshed,and dissolved in water,extracted by ultrasonic wave method. The weight of the fruit of Melia azedarach was standarded to calculate the concentrations of extracts of the fruit of Melia azedarach. Maize seedlings was treated by 33.33%,16.67%,8.33%,3.33%,1.67% extracts of fruit of Melia azedarach, and their growth was observed. The results showed that the extract of the fruit of Melia azedarach had promoting effect on growth of maize seedlings and root .But when exceeding a concentration, inhibitory effect was observed. 33.33% extract of the fruit of Melia azedarach showed inhibition effect on maize growth, the root was decayed.