ABSTRAKPopulation and diversity of arbuscular mycorrhiza fungi (AMF) are varied in the soil and influenced by biotic factors such as host plant and abiotic factors such as soil fertility, soil moisture, pH, temperature, etc. This study aimed to determine the population, diversity, and the dominant type of AMF in the rhizosphere of Kasetsart cassava clones obtained from LampungTimur and Tulang Bawang Barat Regencies, Lampung Province, Indonesia. Population of AMF was counted directly from the rhizosphere of Kasetsart cassava clones and the diversity of AMF was assesed using a pot culture experiment. The results showed that the population and the diversity of AMF in the rhizosphere of Kasetsart clone obtained from Tulang Bawang Barat was higher than that from LampungTimur. The predominant type of AMF found in the pot culture using soil samples from Lampung Timur was spore with S2 code that belongs to the genus Gigaspora and S4 code that belongs to the genus Glomus. On the other hand, the type of AMF found in the rhizosphere of soil samples from Tulang Bawang Barat was dominated by spore with S9 code that belongs to the genus Entrophospora. Keywords: Arbuscular mycorrhiza fungi, cassava, diversity, populationPopulasi dan keragaman fungi mikoriza arbuskular (FMA) sangat beragam di dalam tanah karena dipengaruhi oleh faktor biotik seperti jenis tanaman inang dan abiotik seperti kesuburan tanah, kelembaban, pH, suhu, dll. Penelitian ini bertujuan untuk mengetahui populasi, keragaman, dan jenis FMA yang dominan pada rizosfir ubi kayu Klon Kasetsart yang ditanam di Kabupaten Lampung Timur dan Tulang Bawang Barat. Populasi FMA dihitung langsung dari sampel tanah rizosfir ubi kayu Klon Kasetsart, sedangkan penentuan jenis-jenis FMA pada sampel tanah dilakukan melalui kultur pot. Hasil penelitian menunjukkan bahwa populasi dan keragaman FMA pada sampel tanah dari rizosfir ubi kayu Klon Kasetsart di Kabupaten Tulang Bawang Barat lebih tinggi dibandingkan dengan sampel tanah rizosfir ubi kayu Klon Kasetsart dari Kabupaten Lampung Timur. Jenis FMA yang dominan dari hasil kultur pot dengan sampel tanah Kabupaten Lampung Timur yaitu spora dengan kode S2 yang termasuk ke dalam genus Gigaspora dan kode S4 yang termasuk ke dalam genus Glomus. Sedangkan pada Kabupaten Tulang Bawang Barat didominasi oleh jenis spora dengan kode S9 yang termasuk ke dalam genus Entrophospora.
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