Inoculação de sementes de diferentes cultivares de trigo com Azospirillum brasiliense associada a adubação nitrogenada

Abstract

Wheat is a highly nitrogen-demanding crop, thus, cultivars with greater productive potencial need greater extraction of this nutrient. In grasses, nitrogen assimilation can be more eficiente through bactéria such as Azospirillum brasiliense. Thus, the objective of this work is to evaluate the response of diferente wheat cultivars to inoculation associated with nitrogen fertilization. The design used was a randomized block design, with 3 replications, 4x5 two-factor scheme, with four wheat cultivars: TBIO Ponteiro, TBIO Astro, ORS Ágile and TBIO Audaz and five combinations of application of N/use of inoculant: control, without application of nitrogen and without the use of inoculant; only use of Azospirillum brasiliense inoculant; only application of N in sowing and covering; N application at sowing and topdressing + Azospirillum brasiliense inoculant; and application of N at sowing + inoculant of Azospirillum brasiliense. There was a significant interaction between whear cultivars on the use of inoculant associated with nitrogen fertilization for grain yield. The most responsive cultivar to inoculant and nithogen fertilization was TBIO Ponteiro. When nitrogen was Applied at sowing and topdressing, plus the use of inoculant with Azospirillum brasiliense, there was a greater number of productive tillers, greater ear length and greater number of spikelets per ear. There was no significant effect of inoculation associated with nitrogen fertilization on hectoliter weight.