Use of Biostimulants to Reduce Chemical Fertilizers of Shallot Plants

The use of biostimulants from endophytic bacteria enriched with seaweed is still rarely used in shallot plants. This study was conducted to determine the effect of reducing NPK chemical fertilizers and adding biostimulants to shallot plants in the highlands. The research was conducted in Lembang, Indonesian Vegetables Research Institute, Indonesia (IVEGRI) from January to July 2021. A two-factor Randomized Complete Block Design used two types of biostimulant formulation (biostimulant A, and biostimulant B), and the chemical fertilizer dose factors (7 levels with 3 replications. The observed parameters included plant height, number of leaves, clump fresh weight and dry weight of bulbs per sample and per hectare, as well as the Relative Agronomic Effectiveness (RAE). The results showed that the application of 75% NPK plus biostimulant at a dose of 3ml/L applied as much as 5X gave the same RAE value as NPK 100%.