RESPOSTAS MORFOFISIOLÓGICAS E FOTOSSINTÉTICAS DE MATERIAIS GENÉTICOS DE MILHO A FORMAS DE APLICAÇÃO E DOSES DE Azospirillum brasilense

Abstract

The present work aimed to evaluate the effect of doses and forms of application of A. brasilense in corn genetic materials on morphophysiological and photosynthetic parameters. The experimental design was in randomized blocks, in a 4x4x2 factorial scheme, with three repetitions. As Treatments, four doses of inoculant were tested (0, 200, 400 and 800 mL.ha-1), two forms of application (via seed and via foliar spray) in four cultivars of corn (varieties SCS 154, SCS 155, SCS 156 and hybrid VIP 3). The evaluation parameters were chlorophyll content; fresh mass of stem, leaf and total shoot; dry mass of stem, leaf, root, total shoot and total plant; mean neck diameter; volume of source; leaf area; plant height; number of leaves developed; initial fluorescence, maximum, variable and terminal; and photochemistry. When A. brasilense is applied in at doses of up to 200 mL.ha-1 there was an increase in the total chlorophyll content. For the SCS 156 variety, regardless of the form of application or dose used, reduction of phytomass production in the aerial part of the plant, as for the SCS 154 and SCS 155 varieties, better development of the plants was observed with a dose of up to 200 mL.ha-1. Best response of parameters morphophysiological characteristics was observed for the variety SCS 155 when inoculation is performed via foliar spraying, for the varieties SCS 154, SCS 156 and the hybrid maize VIP3, with the average values, the best development of the plants is observed when the inoculation is done via seed.