Universal Journal of Agricultural Research 10(5): 526-533, 2022 http://www.hrpub.org DOI: 10.13189/ujar.2022.100507 Potential of Liquid Organic Fertilizer on Flowering, Yield of Shallots (Allium cepa L. Aggregatum) and Soil Quality Eddy Triharyanto 1,* , Desy Setyaningrum 2 , Daffa Maulana Muhammad 1 1 Department of Agrotechnology, Faculty of Agriculture, Universitas Sebelas Maret, Indonesia 2 Doctoral Program of Agriculture Science, Faculty of Agriculture, Universitas Sebelas Maret, Indonesia Received July 17, 2022; Revised August 15, 2022; Accepted September 19, 2022 Cite This Paper in the Following Citation Styles (a): [1] Eddy Triharyanto, Desy Setyaningrum, Daffa Maulana Muhammad , "Potential of Liquid Organic Fertilizer on Flowering, Yield of Shallots (Allium cepa L. Aggregatum) and Soil Quality," Universal Journal of Agricultural Research, Vol. 10, No. 5, pp. 526 - 533, 2022. DOI: 10.13189/ujar.2022.100507. (b): Eddy Triharyanto, Desy Setyaningrum, Daffa Maulana Muhammad (2022). Potential of Liquid Organic Fertilizer on Flowering, Yield of Shallots (Allium cepa L. Aggregatum) and Soil Quality. Universal Journal of Agricultural Research, 10(5), 526 - 533. DOI: 10.13189/ujar.2022.100507. Copyright©2022 by authors, all rights reserved. Authors agree that this article remains permanently open access under the terms of the Creative Commons Attribution License 4.0 International License Abstract Continuous intensification of agriculture with inorganic fertilizers causes a decrease in soil quality; grumusol soil has high clay content and low organic matter. This study aims to examine the effect of liquid organic fertilizer on flowering, shallot yield, and the ability to improve soil quality. The research used a completely randomized block design with one factor, namely fertilization with six levels: 100% inorganic fertilizer; 75% inorganic fertilizer and 25% liquid organic fertilizer; 50% inorganic fertilizer and 50% liquid organic fertilizer; 25% inorganic fertilizer and 75% liquid organic fertilizer; 100% liquid organic fertilizer; 100% solid organic fertilizer. Repeat three times. Fertilization has a significant effect on the flowering of shallots. Liquid organic fertilizer can support shallot flowering with the highest number of flowers, namely 8 flowers. However, fertilization did not affect the yield of shallots. Liquid organic fertilizer can increase carbon organic and soil organic matter, exchangeable potassium content, exchangeable sodium content, and the number of bacteria. The highest number of fungi was fertilized with 50% inorganic fertilizer, and 50% liquid organic fertilizer, namely 2.0.105 cfu/gr. Substitution of inorganic fertilizers with liquid organic fertilizers can support soil nutrients so that liquid organic fertilizers have the potential to replace inorganic fertilizers to stimulate flowering and increase the growth and yield of shallots. Keywords Anorganic Fertilizer, Number of Flowers, Organic Fertilizer, Soil Biology, Soil Chemistry 1. Introduction Shallots (Allium cepa L. Aggregatum) are horticulture with a high economic potential to be developed. The shallot consumption of the Indonesian population increased in 2018. However, the productivity of shallots is still relatively low [1]. The Central Statistics Agency (2019) stated that in 2014-2017, the national productivity of shallots decreased from 10.22 tons/ha to 9.29 tons/ha, so the production of shallots in Indonesia has not yet met the level of consumption [2]. Agricultural intensification is an effort to support increased productivity of shallots [3]. Shallot farmers often use chemical fertilizers for agricultural intensification and high yields. However, these chemical fertilizers can only be absorbed by plants by 10-40%, and the rest of the fertilizer remains in the soil in the form of insoluble inorganic salts [4,5]. Soil can be negatively affected by the continuous use of chemical fertilizers, namely the presence of ammonium-nitrogen (NH4+) and phosphorus residues. These residues cause an increase in soil acidity and change the structure of bacterial and fungal communities [6].