Análise fitométrica em plantas de arroz de terras altas inoculadas com estirpes de azospirillum

Abstract

The rice culture (Oryza Sativa) is the third most consumed cereal in the world, serving as a basis for food to many countries. Regarding rice cultivation, nitrogen is the most limiting nutrient in production and can be supplied by biological fixation, which is performed by some nitrogen-fixing bacteria. Given the above, the present work aimed to evaluate the phytometric characteristics of rice plants inoculated with Azospirillum. The experiment was conducted at the Federal University of Mato Grosso, in Rondonópolis university campus in a greenhouse. The design was completely randomized with 8 treatments and 6 replications totaling 48 experimental units (1 dm³ vessels), where the vessel capacity was maintained at 60% during the experiment. The treatments are inoculant commercial, strain AZ52, 50 mg dm-3 de N in the form of urea (full dose), inoculant commercial + 30% de N(percentage for full dose), inoculant commercial + 60% de N, AZ52 + 30% de N, AZ52 + 60% de N and one absolute. The variables analyzed were height of plant number of tillers, number of leaves and root volume. The data were analyzed with the assistance of the statistical program SISVAR and the averages submitted to Tukey test at 5% probability. Significant differences can be observed between treatments in all analyzed variables, where the inoculated (with or without added nitrogen) treatments presented root volume, number of profiles, plant height and number of leaves superior to the absolute control and average values similar to nitrogen treatment. The treatments inoculated provided increment to the plant development showing to be beneficial the interaction of Azospirillum with plants of rice.