EFFECTS OF DIFFERENT LEVELS OF GIBBERELLIC ACID (GA₃) ON GROWTH OF SOUR ORANGE (C.AURANTIUM L.) SEEDLINGS

Eight-month-old seedlings of sour orange were sprayed with 0, 25, 50, 75, 100 and 200 ppm of the water soluble salt of gibberellic acid at 15-day intervals.

Data collected two months later revealed that Ga₃ significantly increased (P < 0.05) seedling height by internodal expansion and that the seedling height was positively correlated with GA₃ level.
The percentage increase in height was 13.95, 18.68, 19.63, 25.90, 31.80 and 38.80 respectively for 0, 25, 50, 75, 100 and 200 ppm GA₃ treatments.

Maximum leaf size was produced by control plants while increasing concentrations of GA₃ progressively reduced leaf size.

Stem girth and number of leaves were not affected by the different treatments.

V Africa Symposium on Horticultural Crops

O.A. Sidahmed

https://doi.org/10.17660/ActaHortic.1978.84.19