The objectives of the present study were to evaluate the effects of arbuscular mycorrhiza, the plant P nutritional status and increasing levels of P in nutrient solution on Zn toxicity to Trema micrantha (L.) Blum. In a first experiment trema seedlings were grown in a substrate with increasing P rates [0, 100, 200 and 400 mg dm-3 as Ca(H2PO4)2], besides a mycorrhizal treatment inoculated with Glomus etunicatum (Ge). After 60 days of growth, the plants were transferred to pots with Clark’s nutrient solution […]

The Amazon banana plant is of great socio-economical importance, despite its requirement for high agricultural input in order to obtain good yields. An association with arbuscular mycorrhizae fungi could minimize the crop’s nutritional needs in the poor soils of the Amazon. The present study aimed at verifying how the plant-fungus mycorrhizal symbiosis influences nutrient concentration in five varieties of adult banana plants cultivated in an acid Amazon Oxisol under field conditions. The banana plantation was defficient in macro (Ca, Mg […]

The aim of this study was to evaluate the inoculation effect of arbuscular mycorrhizal fungi (AMF) of Brazilian pine plants (Araucaria angustifolia (Bert.) O. Ktze.) at different P levels. The experimental design was completely randomized with a factorial outlay of four inoculation and four P level treatments in five replications. The Araucaria plants, grown in greenhouse conditions, were inoculated either with Gigaspora rosea, with Glomus intraradices, or with a mixture of AMF, collected in a native Araucaria forest in Campos […]

Different sites of an iron mining from Mariana, Minas Gerais, Brazil, were evaluated for determining the degree of their degradation or reclamation, using microbial activity of soil, spore numbers of arbuscular mycorrhizal fungi (AMF) and total count of fungi and bacteria. Each site contained a substrate characterized as flotation refuse (Rj), Soil without vegetation (SS), Subsoil (Ss), Subsoil with vegetation (SsV), site under recuperation (AR) and forest (MS), and was sampled at 10-25 cm. Establishment of grasses and “candeia” (Vanillosmopsis […]