Effects of gibberellic acid on growth of rootstocks for citrus

Abstract

In order to study the effects of gibberellic acid (GA₃) on the growth of citrus rootstocks and the possibility of shortening the period of time for plant formation on nursery, four - month – old seedlings were sprayed with 0.50, 100, 150 and 200 ppm of GA₃ solutions. Plant height increased significantly with the treatments which was positively correlated with GA₃ level. The increases in plant height were 8, 37, 59 and 63%, respectively for 50, 100, 150 and 200 ppm. Stem girth was not affected by the different treatments. The higher concentrations (150 and 200 ppm) showed a tendency to promote dieback of the apex of the plants.