Diversity of potassium solving microbes on andisol soil affected by the eruption of Mount Sinabung, North Sumatra, Indonesia

Abstract

Abstract. Sembiring M, Sabrina T. 2022. Diversity of potassium solving microbes on andisol soil affected by the eruption of Mount Sinabung, North Sumatra, Indonesia. Biodiversitas 23: 1759-1764. Potassium (K) is one of the macronutrients needed by plants for seeds' growth, development, and quality. Andisols covered by volcanic ash from Mount Sinabung contain potassium ranging from 0.39-0.58 me/100g. The use of microbes is one of the alternatives methods to increase the availability of potassium in the soil that can be absorbed by plants. This study aimed to find environment-specific superior potassium-solvent microbes. Soil sampling was carried out in Kutarayat Village, Nama Teran Sub-district, Karo District, North Sumatra, Indonesia. The method used is random composite sampling by taking samples from 4 different locations. Sampling points were taken on Andisol soil that had been processed, covered with thin, medium, and thick ash. Sampling was carried out at a depth of 0-20 cm from the ground surface around the rhizosphere area. Isolation of bacteria and fungi was carried out by using multilevel dilutions. The microbes obtained after using the pour plate method were identified at molecular level by using PCR. Microbial potential test was carried out by using andisol soil which was incubated for 30 days. Parameters observed were soil pH, exchangeable potassium, soil organic carbon, and microbial population. 7 bacterial isolates and 3 potassium solubilizing fungi were isolated and identified during the present study. All bacterial and fungal isolates obtained were able to increase the availability of potassium soil exchange. The research results show that Talaromyces pinophilus can increase potassium soil exchange up to 102.94%.

The Role of Bacillus Subtilis Bacteria on The Growth and Production of Two Varieties of Shallots (Allium Ascalonicum L.) Asal True Shallot Seed

“…The Role of Bacillus Subtilis Bacteria on The Growth and Production of Two Varieties of Shallots (Allium Ascalonicum L.) Asal True Shallot Seed Bacillus subtilis bacteria and various other bacteria can dissolve potassium in the soil. Potassium solvent bacteria can release potassium from a mineral by producing organic acids, such as acetic, citric, oxalic, and so on (Sembiring & Sabrina, 2022). The research results by (Pieterse et al, 2014) show that the application of earthworm types and various microbes, including Bacillus subtilis, has a noticeable influence on plant growth.…”

The ability of potassium-solubilizing fungi isolated from leucite potassium rock deposits

“…In addition to plant metabolism, potassium improves crop quality as it aids grain filling, hence kernel weight, strengthens hay, increases disease resistance, and helps plants to better withstand the stress (Meena et al 2016). Potassium deficiency in plants will inhibit root growth, cause stunted plants, imperfect fruit growth and in turn, decrease plant production (Dasan 2012;Wang and Wu 2013;Sembiring and Sabrina 2022). Potassium in the soil available to be absorbed by plants is only around 2-10%, on the other hand, about 90 to 98% of the total potassium is in a form that is not available for plants (Pratama et al 2016).…”

“…Potassium in the soil available to be absorbed by plants is only around 2-10%, on the other hand, about 90 to 98% of the total potassium is in a form that is not available for plants (Pratama et al 2016). The form of potassium in the soil is determined by some soil physical and chemical condition including soil pH, texture, type and mineral content of clay, water content, soil cation exchange capacity (CEC), and interactions with other cations such as Ca and Mg (Sembiring and Sabrina 2022). Low content of potassium in its available form in the soil causes low absorption of potassium by plants which in turn will result in poor plant growth and quality.…”