Author(s):

Hanafi, Septilina Melati Sirait, Endri Purwanti, Candra Irawan, Henny Rochaeni, Tita Rosita and Juni Aldhani Purba

Abstract: The dryness had the effect to increase the level of abscisic acid in oil palm. The increasing level of abscisic acid in the leaves will induce and regulate stomatal closure so the dryness can be prevented. Dryness can be prevented by watered regularly. The average abscission rate was 2.2361 (μg/g) and watered leaves was 2,3832 (μg/g). Significance different test was at 95% confidence interval and obtained Pvalue equal to 0,005 and value α = 0,05. The average abscisic of oil palm which not watered was higher than the average abscission acid level with watered.

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