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

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.