Application of mycorrhiza for citrus planting
1984
Leka Manoch | Or Vallenuwatana | Supat Attathom (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Plant Pathology)
Rhizosphere soils and roots of som-o (Citrus grandis), som-khiewwan (C. reticulata), som tra (C. sinensis) and manao (C. aurantifolia) were collected trom central, northern and southern Thailand. Spores were separated from soils by using Gerdemann and Nicolson's wet sieving and decanting method and revealed 4 genera and 24 species of VA mycorrhizal fungi. Among them were Acaulospora scrobiculata, A. trappei, A. tuberculata, Gigaspora aurigloba, Gi. gigantea, Gi. gregaria, Gi. heterogama, Gi. pellucida, Glomus aggregatum, Gl. etunicatus, Gl. fasciculatus, Gl. macrocarpus, Gl. microcarpus, Gl. mosseae, Gl. multicaulis, Gl. tortuosum, Glomus spp., Sclerocystis cocogena, S. coremioides, S. clavispora, Sclerocystis sp. and unidentified species. Glomus was the dominant genus encountered in all soil sample. Glomus etunicatus was abundantly found in all Citrus soils, especially those of central Thailand. Pot-culturing of G. etunicatus was established using maize (Zea mays), sorghum (Sorghum bicolor), sudan grass (Sorghum vulgare), Johnson grass (Sorghum halepense) and jungle grass (Echinocloa colonum) as the host plants. Percent of colonization in the host plant and the number of chlamydospores in the soil were checked at 1, 2, 3 and 4 months and were found to increase with the passing time. Sudan grass and sorghum were most suitable for propagation of Gl. etunicatus.
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