Influência de nanopartículas de zinco e bioinoculantes na fitomassa e produção de berinjela sob déficit hídrico.

Abstract

The low water availability that affects the Northeast region of Brazil is a limiting factor that can reduce eggplant production and quality. To minimize this problem, the use of technologies such as zinc nanoxide and bioinoculants that act as attenuator of the water deficit can promote positive results in the eggplant culture. Water stress is a reality present in agricultural areas throughout Brazil, and in a more challenging way in semi-arid regions. These climatic conditions put the production of vegetable species to the test, sharply reducing their performance in low water availability, which limits the expression of all their productive potential. This work aimed to investigate the influence of zinc oxide nanoparticles associated or not with plant growth- promoting bacteria on the production of aerial phytomass and eggplant production. The experiment was installed in subdivided plots in space, where the plots comprised two levels of irrigation (50% and 100% of the evapotranspiration of the culture-ETc) and the subplots, five treatments composed by the combination of nanoparticles of zinc nanoxide (NZnO) and ,or bioinoculants (Bio) containing plant growth-promoting bacteria (C = control, T1 = ZnSO4 via foliar, T2 = NPZnO via foliar, T3 = NPZnO via foliar + Bio, T4 = ZnSO4 via soil + Bio, with four blocks ( In the production phase, the productivity of commercial and non-commercial fruits was evaluated in two harvests and the production of dry mass. Products based on zinc nanoparticles and zinc sulfate, associated or not with plant growth-promoting bacteria (BPCP) did not interfere with eggplant dry mass production. Total fruit production was negatively affected by the water deficit imposed by the 50% ETc depth. (T3) increased the production of commercial fruits during the second harvest under water deficit. Given adequate water supply conditions (100% of ETc), the best performances in terms of commercial fruits were observed in treatments T3 (T3 NPZnO via foliar + Bio) and T4 (ZnSO4 via soil, with application of BPCP via root.