Organic fertilizer decomposed with biofilm biofertilizer to nutrients status and yield of shallot on acid and alkaline soil

¹ Soil Science Study Program, Faculty of Agriculture, Sebelas Maret University, Surakarta, Central Java, Indonesia
² Agrotechnology Study Program, Faculty of Agriculture, Sebelas Maret University, Surakarta, Central Java, Indonesia

^* Corresponding author: sudadi62@staff.uns.ac.id

Abstract

The use of organic fertilizer in organic farming increases carbon sequestration so will reduce CO₂ concentration in the atmosphere and impact of global warming. Research aims to study the effect of biofilm biofertilizer (BiO₂) formulas and organic fertilizer dosages on soil nutrients status and shallot yield in acid (Alfisol) and alkaline (Vertisol), Experiment was conducted in field with two treatment factors says BiO₂ formula (F₀, F₁, F₂, and F₃) and doses of organic fertilizer composted with biofilm biofertilizers i.e 0, 10 and 20 tonha^-1 (D₀, D₁₀, and D₂₀). As a comparison treatment was NPK at a rate of 200 kg urea, 200 kg ZA, 400 kg SP-36 and 250 kg KCl per hectare). The observed variables include available-P, exchangeable-K and shallot bulb weights. Data analyzed by ANOVA followed by DMRT at 95% level confidence. The dose of organic fertilizer increased significantly of observed variables, while the formula of BiO₂ was not. The application of organic fertilizer at 20 tonha^-1 increased available-P, exchangeable-K and weight of shallot bulbs on Vertisols and Alfisols. Compared to the NPK fertilizer treatment, the application of 20 tonha^-1 organic fertilizer provided higher shallot yield on Alfisol soil but lower on Vertisol soil. It need further reseacr to identified the factor causing lower yield on Vertisol.