The Bioassay of Vesicular Arbuscular Mycorrhizal Inoculums on Cassava Plant in Greenhouse

บทคัดย่อ

The bioassay was carried out in greenhouse with Pakchong and Yangtalard soil. The experimental design was CRD with 4 replications and the host plant was KU-50 cassava. Stalks were grown in plastic pots containing 2 l of sterilized soil, nonsterilized soil, nonsterilized soil with Glomus sp. T6 and
nonsterilized soil with Glomus sp. D13, depending upon each treatment. The bioassay was checked 2 times, 6 and 12 weeks. The results revealed that roots of cassavas were proliferately colonized by 2 isolates of Glomus sp. and the amount of root infections were higher than those of indigenous species from nonsterilized soil.The root infection of Glomus sp. T6 was higher than that of Glomus sp. D13 in both soils. P concentrations in the leaves of most VAM inoculated plants at both soils were higher than those of noninoculated plants. Height of plant in Yangtalard soil was higher than that in Pakchong soil. Growth of almost VAM inoculated plants were lower than plants grown in sterilized soil at 6 weeks, while the positive
effect of VAM on growth of tested plants appeared at 12 weeks.