Desenvolvimento de milho safrinha em doses de azospirillum e nitrogênio em solo arenoso

Abstract

Nitrogen (N2) is 78% of the gases, however plants cannot assimilate it in this firm, making biologic fixation necessary. Biological nitrogen fixation in grasses is a unique process of nitrogen fixing bacteria Azospirillum and Herbaspirillum genders, organisms capable of fixing atmospheric nitrogen in the soil and cause phyto-hormone production stimulation that enhance germination and plant growth development. The experiment was established at Caarapó region, the coordinates were 22.33'21" South and 54.49'50" West. The aim of the study was to evaluate the feasibility of bacteria doses inoculation in corn seed and mineral nitrogen levels in coverage in order to identify the bacteria's ability to assist the nitrogen uptake of winter maize. The treatments were arranged in a split plot scheme, represented by three inoculations (d0, d1 and d2) in the plot and 4 levels of nitrogen in the subplots with 5 repetitions. Inoculation of bacterias in corn seeds had a positive effect during the growth and development of the plant. The effect of double inoculant dose (d2) did not show statistically significant results for the variables evaluated in this experiment and this increased inoculant dose did not result in increased productivity to justify twice the dosage.