SULFATE AMMONIUM FERTILIZER ON THE OFF-SEASON PRODUCTION OF SNAKE FRUIT (Salacca sumatrana Becc.)
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Salacca sumatrana (Becc.), known locally as the Sidimpuan snake fruit, is one of the prime local commodity specialties of Padangsidimpuan City in Sumatra. The fruit is known for its sweet, sour, and astringent taste, which differentiates it from Pondoh and Balinese snake fruits. Recently, snake fruit farmers have noticed a continuous decrease in production due to failure in fruit set, particularly during the off-season. The use of fertilization and drip irrigation during the off-season has therefore been explored as a potential solution. Hence, this research investigated the use of these methods to overcome fruit-set failure and to ensure continuous production of Sidimpuan snake fruit throughout the year. Specifically, this study aimed to determine the optimal dosage of ammonium sulfate fertilizer and the appropriate drip irrigation level to improve fruit setting during the off-season. This research employed a split-plot design, with drip irrigation as the main plot and ammonium sulfate fertilization as the subplot. The observed parameters included the number of flower and fruit bunches, fruit-set percentage, and leaf nutrient content. Drip irrigation significantly affected fruit-set percentage and the number of harvested fruit bunches. The best treatment combination was 400 g ammonium sulfate fertilizer per plant combined with drip irrigation at 3,000 mL per plant. Fertilization applied during July–September resulted in an off-season harvest that was comparable to the on-season harvest fertilized during April–June, with differences of 10.76% in fruit-set percentage and 25.65% in the number of fruit bunches. These results indicate that the application of ammonium sulfate fertilizer combined with drip irrigation can overcome fruit-set failure in Sidimpuan snake fruit, particularly during the off-season.
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