The Effects of Some Plant Growth Regulator on Seedling of Laurel (Laurus nobilis L.)

Abstract

An investigation was carried out to consider the effect of polystimulins (PS), gibberellic acid (GA(3)) and stratification date on the growth of laurel seedlings. Seeds treated with PS-A6+PS-K and GA(3) at two different concentrations before stratified, and a total of 315 seedling were investigated taking account of height, root collar diameter, root length and number of leaves. The greatest height and root length were found with the treatment GA(3) at 50 mg/100 ml. The greatest seedling height measured 21.2 cm at the 50 mg/100 ml level, compared with 13.9 cm for the stratification at 70 days seedlings. The greatest root collar diameter measured 5.8 mm with the stratification at 30 days seedlings, while the least measured 4.3 mm with the GA(3) application at 50 mg/100ml seedlings. To conclude, it is obvious that hormone application is very effective and has contributed significantly to the metabolism of laurel seedlings. According to this study, the application of GA(3) to laurel seedlings has been recommended for practical use in nursery conditions.