Improving Shallot Yield Performace through Applications of Vermicompost and Mycorrhiza with Low Doses of Synthetic Fertilizer

The objective of this study was to reduce the use of synthetic fertilizers on shallot production by application of vermicompost and mycorrhiza. The study was arranged by using a factorial Randomized Completely Block Design. The factors of vermicompost dose viz. 0, 20 and 40 t ha-1, the dose of mycorrhiza viz. 0, 10, and 20 g plant-1 and the dose of synthetic fertilizer based on recommendation dose viz. 100% (138 kg N ha-1, 72 kg P2O5 ha-1 180 kg K2O ha-1), 75% (103 kg N ha-1, 54 kg P2O5 ha-1, 135 kg K2O ha-1) and 50% (69 kg N ha-1, 36 kg P2O5 ha-1, 90 kg K2O ha-1) were tested. The variables observed included the number of bulbs, fresh weight of bulbs and bulbs diameter. All variables were observed at harvest time. The use of 50% synthetic fertilizer along with 40 t ha-1 of vermicompost and 20 g plant-1 of mycorrhiza gained equal number of bulbs, fresh weight of bulbs and diameter of shallot bulbs compared to application of 100% synthetic fertilizer only. Therefore, the reduction of 50% synthetic fertilizer with application of vermicompost and mycorrhiza could support sustainable of agriculture on the production of shallot.