Emergência e crescimento inicial de plantas de soja e nabo forrageiro por Trichoderma sp.

Abstract

The use of biostimulants, macro and micronutrients, influence the productivity and its deficiency affects the phytosanitary aspects of the culture of soybean and forage turnip. According to the context, the objective of this work was to evaluate the emergence and initial growth of soybean and forage turnip plants with Trichoderma sp. The experiments were carried out at the Laboratory of Phytopathology and Soil Microbiology at the Itaqui Campus of the UNIPAMPA. The library of this laboratory yielded the biological control agent Trichoderma sp. for the development of the present study. The powdered formulation of Trichoderma sp. was performed using autoclaved rice as a substrate for fungus growth. It was dried in greenhouse and then crushed in a blender and sifted. The experimental design was completely randomized, with three treatments and four replicates for each culture. Each replicate consisted of an acrylic box of the gerbox type containing 25 seeds. The treatments used were: Trichoderma sp. incorporated into the substrate surface, Trichoderma sp. inoculated in the seed and control. The emergence speed, emergence at 7 days, root length (the 10 largest plants were selected per replicate) and weight of the green mass of the roots (of the 10 plants selected) were evaluated. The data were submitted to analysis of variance by the F test and these were compared by the Tukey test at 5% probability. Statistical tests were performed using Sisvar software. According to the data obtained it can be observed that there was significant difference only for the IVE variable in soybean. The data obtained from the evaluation of the radish forage showed a significant interaction only for the variable IVE (emergency speed index), where the control was outstanding over the other treatments. The Trichoderma sp. used in the experiment did not stimulate the emergence and initial growth of soybean and forage plants.