Potassium fertilizer doses and local microorganism concentration affecting growth and yield of shallot (Allium ascalonicum L.)

This study aimed to determine the effect of potassium fertilizer doses, Local Microorganism concentrations, and the interaction between the two factors on the growth and yield of shallots. The study applies Randomized Block Design with 3 x 4 Factorial and 3 replications. The observed factors were potassium fertilizer at 3 levels each of control, 100, and 200 kg ha-1 and Local Microorganisms at 4 levels each of 0, 75, 150, and 225 ml L-1). The highest yield potential of the shallots was found at a dose of 100 kg ha-1 potassium fertilizer. The highest diameter of shallot bulbs was initiated at 150 ml L-1 of Local Microorganism concentration, but it was not significantly different from the control treatment. The combination of a potassium fertilizer dose of 200 kg ha-1 and a local liquid microorganism concentration of 75 ml L-1 provide the highest growth and yield of shallots.