Spraying gibberellin solution on celery can promote cell division and growth. The absorption of nutrients by cells reaches a peak at 8 hours after spraying. According to experiments, the optimal concentration of gibberellin for the growth of celery is 0.004% to 0.009%. During the normal growth of celery, it can be sprayed two or three times every two weeks.
If the supply of nutrients in celery is insufficient, yellowing of leaf color, cracking of stems, and weak stalks will occur after gibberellin is sprayed, which will directly affect the yield and quality of celery. Spraying gibberellin should be combined with foliar spray to supplement nutrients. The conventional formulation for foliar spraying is: 0.2% potassium dihydrogen phosphate plus 0.03% borax plus 5% brown sugar.
Gibberellic acid is an acid preparation and it is forbidden to mix with alkaline preparations. During spraying, the soil remains moist, the plants must be strong, and the rain should be avoided.
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