Inoculação de bactérias diazotróficas associativas e coinoculação de rizóbio em arroz de terras altas

Abstract

The objective of this study was to evaluate the efficiency of inoculation of associative bacteria and the coinoculation of rhizobia in upland rice. The experiment was conducted under greenhouse conditions. The experiment was conducted in a completely randomized design with seven treatments: commercial inoculant (CI), coinoculation with four rhizobia strains: MT16, MT23, MT08, MT15 and two controls (nitrogen - 50 mg dm-3 nitrogen in the form of urea, and absolute without nitrogen and without inoculation), with 5 replicates, totaling 35 experimental units. The cultivar of rice used was BRS Esmeralda. The variables analyzed were: Falker chlorophyll index, number of tillers, plant height, dry shoot mass, grain mass, root volume, root dry mass and total dry mass. The SISVAR statistical program was used for data analysis. Statistical differences were observed between treatments. The results showed that the co-inoculated rice plants presented beneficial results similar to the nitrogen control for the variables plant height, Falker chlorophyll index, root dry mass, root volume and number of tillers. In addition, all treatments presented superior performance when compared to the absolute control. Therefore, the inoculation of associative diazotrophic bacteria coinoculated with rhizobia showed a beneficial effect on the development of rice plants. L