Characteristics of indigenous mycorrhiza of weeds on marginal dry land in south Konawe, Indonesia

摘要

South Konawe is one of the areas that have the potential for the development of marginal farming dry land, which is wide enough, with a predominance of Ultisol type. In such area, more than 80% of farming communities who are dependent on the farming activities are still conventional to characterize the shifting cultivation. In many cases, most weeds that grow in their land are always considered to be destructing and disturbing the human interests, both during the land clearing and after the fields abandoned. On the other hand, the presence of weeds can be useful for the growth of plant as it provides benefits against microorganisms. One of the microorganisms which is associated with roots of weed is mycorrhiza. This study aims to determine the characteristics of indigenous mycorrhiza being present on dry weeds from marginal land. This study was conducted from May to November 2013 in South Konawe, Indonesia. The result shows that two types of indigenous mycorrhiza were present on the marginal dry land; Glomus sp and Gigaspora sp. The highest percentage of indigenous mycorrhiza infection was found in the roots of weeds Amaranthus gracilis and Sida rhombifolia, each of which by 90%. The presence of the vesicles and internal hyphae on the roots of weeds indicate the indigenous mycorrhiza infection.