Azospirillum Brasilense and jasmonic acid as attenuators in the productivity of criollo corn cobs under different water regimes

Abstract

In this way, the objective was to evaluate the action of Azospirillum brasilense and jasmonic acid as attenuators in the productivity of Creole corn plants in different water depths. The experiment was conducted in a greenhouse, belonging to the Integrated Weed Management Group of the Amazon (MIPDAM), located at the Institute of Agricultural Sciences (ICA) of the Federal Rural University of the Amazon (UFRA), municipality of Belém (PA), the experimental design was completely randomized in a factorial scheme of type 2 A. brasilense (absence and presence) x 3 Jasmonic Acid (0,10 and 20 µmol L^-1) x 3 irrigation depths (60.80 and 100% of CC), containing 4 replications, totaling 72 experimental units, using Creole corn seeds. Evaluations were carried out at the physiological maturity stage R6: number of tassels, number of branches of the tassel, number of ears, number of ears, height of ear insertion, diameter of ear with straw, diameter of ear without straw, diameter of cob, mass of cob with straw, mass of cob without straw, mass of cob, length of cob, number of rows per ear, number of grains per ear, mass of grains per ear. The experimental data were submitted to the Shapiro-Wilks and Levene tests at 5% significance. Subsequently, analysis of variance was carried out, in which the developments were shown to be significant. The effects of doses of jasmonic acid in the presence and absence of A. brasilense and in water deficiency conditions were studied by means of polynomial regression analysis, observing the results of the F test (p <0.05) of the analysis of variance, by using the SISVAR statistical software. The MGE variable adjusted to the quadratic model in the states of 80% and 100% of the CC in the absence and presence of A. brasilense with the best mathematical value of technical efficiency (Ymet) in 100% of the CC in the presence of A. brasilense, 41,48% higher than the 80% treatment of CC. In the NGE variable, the conditions of 60%, 80% and 100% of the CC in the absence of A. brasilense showed adjustment to the quadratic model, obtaining a better Ymet in 100% of the CC, a quantity 50,55% greater in relation to 80% of the CC and 66,35% compared to 60% of CC. The 80% CC blade showed better interactions between A. brasilense and Jasmonic acid in the studied variables. Jasmine acid obtained better responses in isolation between the irrigation depths. The results for the blade of 60% of the CC with the use of attenuators were inferior to those of the other slides. The treatment of 10 µmol.L^-1 of AJ was the one that came closest to the dosages estimated as positive for plant productivity.