Penjaringan Azotobacter Sp Dan Azospirillum Sp Dari Ekosistem Lahan Sawah Sebagai Sumber Isolat Pupuk Hayati Penambat Nitrogen

Abstract

Utilization of Azotobacter and Azospirillum as microbial N 2 fixation may be a solution in reducing the use of inorganic N fertilizer. Inoculation of microbial N 2 fixation requires superior isolates in N 2 fixation and high viability. A screening experiment to get the Azotobacter and Azospirillum isolates superior in N 2 fixation and high viability in paddy field has been performed at the Laboratory of Biology and Biotechnology soil, Faculty of Agriculture, Universitas Padjadjaran. Isolates taken from the rhizosphere and roots of paddy at Sukatani and Karangbahagia-Bekasi, Rengsdengklok-Karawang, Jatinangor-Sumedang and Ciparay-Bandung. The results obtained bacterial isolates are superior in N 2 fixation and viability were Azotobacter chroococcum from rhizosphere of paddy Ciherang varieties at Rengasdengklok-Karawang and Azospirillum irakense from roots of paddy Ciherang varieties at Ciparay-Bandung.