Uso de micorrizas em mudas de pinus (Pinus elliottii Engelm. e Pinus taeda L.) com diferentes doses de fósforo e nitrogênio

Abstract

This study aimed to evaluate the initial development and nutritional status of Pinus elliottii and Pinus taeda in natural substrates inoculated with mycorrhizae, offering technical indications on the use of nitrogenous and phosphate fertilizers in the production of seedlings of the species. The experiment was conducted at the forest nursery UTFPR Campus Dois Vizinhos, PR, with seedlings of Pinus elliottii and Pinus taeda. The treatments consisted of adding mycorrhizal fungi and application of phosphate rock and soluble phosphate, the experiment was conducted in plastic tubes with capacity 50 cm ³, a number eight tubes per replicate with three replicates. The conduct of the experiment was given for a period of approximately one year from the deployment (April/2012). The species Pinus elliottii has better plant growth, dry matter production and nutrient content in the root and shoot biomass relative to Pinus taeda, with greater height and diameter of plants. Fertilizer Single Super Phosphate (SSP) provides the best initial seedlings compared to phosphate fertilizer Natural (FN), but these results in half the dose and standard dose of fertilizer, both species as the species Pinus elliottii Pinus taeda. As the inoculation of mycorrhizal fungi in the substrate is efficient providing better seedling growth, dry matter production and nutrient content in the root and shoot biomass compared to the substrate without the fungi.