Impact of Boron and Gibberellin on the Growth and Yield Bima Brebes Variety of Shallots in Bangka Island
Keywords:
Shallot, Gibberellin, boronAbstract
Shallot (Allium ascalonicum L.) is known as a horticultural commodity with significant economic value. Demand for shallot increases annually due to population growth and changes in consumption habits. High consumption of shallot on Bangka Island is not matched by adequate local production. Low local shallot production on Bangka Island is caused by nutrient deficiencies in the planting medium. The application of plant growth regulators (PGRs) such as gibberellin (GA3) and micronutrients such as boron (B) has been proven to increase shallot production. This study was conducted at the Bangka Tengah Farmers' Garden from July to September 2025. This study applied a randomized block design (RBD) with two factors and separate plots, where the main plot was the boron dose with three levels, namely 0 kg ha⁻¹ (B0), 2 kg ha⁻¹ (B1), and 4 kg ha⁻¹ (B2), while the subplot was the GA3 concentration, which included four levels, namely 0 ppm (G0), 25 ppm (G1), 50 ppm (G2), and 75 ppm (G3). Each treatment combination involved 5 plants and was repeated 3 times. The findings revealed that gibberellin application showed a very significant effect on plant height and fresh weight of shallots, and also had a significant effect on the number of tillers. On the other hand, the addition of boron did not have a significant effect on all measured variables. The use of gibberellin at a dose of 50 ppm is the best value for the number of tillers and is the highest average value for the leaf number variable compared to other concentrations. Meanwhile, a boron dose of 2 kg ha-1 provided the best results for the number of leaves, number of offshoots, number of umbels, fresh weight, and dry weight of Bima Brebes onion varieties.
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