Produtos biológicos, bioregulador de crescimento e Bacillus sp. no tratamento de sementes de alfafa inoculadas com Penicillium spp.

Abstract

Alfalfa (Medicago sativa), is known for its productivity and quality, considered one of the best fodder for dairy cattle and horses, as well as goats and sheep. However, its productivity is limited by abiotic and biotic factors, among which the incidence of diseases stands out, mainly transmitted by seeds. Given this scenario, the objective of this study was to verify the potential of biological products, growth bioregulators and Bacillus sp. (isolated RD 34), via microbiolization of alfalfa seeds inoculated or not with Penicillium spp., in the promotion of seedling growth and in the control of pathogens in seeds. For this purpose, culture seeds, inoculated or not with Penicillium spp, were subjected to the following treatments with the StimuControl® product “based on Trichoderma harzianum”; Quality® product “based on Trichoderma asperellum”; product Stimulate® based on phytohormones; Bacillus sp. DR 34; witness the base of distilled water. The following variables were evaluated: germination (G); emergency speed index (IVE); aerial part height (APA); root part length (CPR); partially dry weight of the shoot (PPSPA), partially dry weight of the root part (PPSPR) and sanitary quality. The results obtained were submitted to analysis of variance (ANOVA) at 5% of significance and the averages were compared by Tukey's test, using the SISVAR program. With the data obtained, it is concluded that the use of biological products had a significant effect on germination, IVE and plant growth, as well as on controlling the incidence of the fungus Aspergillus spp. The growth bioregulator had an effect on shoot height, root length and shoot dry weight. The Bacillus sp. RD 34 had an effect on IVE and shoot dry weight. Alfalfa seed treatment provides effects on seedling growth promotion and control of Aspergillus spp. in the seeds.