Eksplorasi dan Uji Potensi Bakteri Pelarut Kalium Asal Limbah Teh pada Tingkat Dekomposisi Berbeda

Abstract

There are various microbes living in tea waste, some of which might be capable of solubilizing potassium (K). Potassium is a primary essential macro nutrient sourced mainly from minerals in the soil. The purpose of the study was to determine the type and population of potassium solubilizing bacteria and the potential of potassium solubilizing bacteria from various levels of decomposition of tea waste from Kebun Bah Butong Sidamanik in dissolving potassium. This research was conducted at the Biologi Tanah laboratory of the faculty of agriculture, University of North Sumatra. Isolation of potassium solubilizing bacteria using Aleksandrov media. Testing the potential to dissolve K with potassium sources K2HPO4 and feldspar (KAlSi3O8). The research consisted of several stages, namely isolation of bacteria from tea waste compost, purification of potassium solubilizing bacteria to obtain pure isolates, gram staining, macroscopic and microscopic observations of potassium solubilizing bacteria, and potential tests on several K sources on Aleksandrov media. The results showed that there were 4 types of potassium solubilizing bacteria isolates derived from tea waste. Isolates A, B, C, and D were able to dissolve potassium on Aleksandrov media. The four types of isolates were tested on Aleksandrov media with several K sources incubated for 7 days, with the largest potassium dissolution index obtained at 3.93. Potassium-solubilizing bacterial isolates from tea waste were better able to dissolve potassium feldspar than K2HPO4.