Indonesian

Abstract

Prayudyaningsih R, Nursyamsi, Sari R. 2015.Advantaging soil microorganism on the rhizosphere of tuber crop under the shade of community forest stand in South Sulawesi.Pros Sem Nas Masy Biodiv Indon 1: 954-959. Utilization of space under the stand of Vitex cofassus (bitti) stand, Toona sinensis (suren), Tectona grandis (teak) and Aleurites moluccana (hazelnut) with tuber crops are not only expected to improve the economy of the local community but also to improve soil fertility as well as soil conservation. The existence of tuber crops would extend rhizosphere zone so that it will increase soil microorganism population. The presence of beneficial soil microorganisms such as phosphate solubilizing bacteria and free-living N-fixing bacteria are expected to increase soil fertility. The objective of the research was to identify phosphate solubilizing bacteria and free-living N-fixing bacteria on the rhizosphere of tuber crops grown under community forest stands in South Sulawesi. The results showed genera of phosphate solubilizing bacteria on the rhizosphere of tuber crops which grown under community forest stands i.e., Micrococcus and Clostridium, in which the highest number of bacterial colonies were found on rhizosphere of Xanthosoma violaceum (kimpul). There was one genus of free-living nitrogen-fixing bacteria i.e Azotobacter, in which the highest number of bacterial colonies was found in the rhizosphere of Amorpohophallus campanulatus (iles-iles/suweg).