Germinação de sementes e crescimento de plântulas de aveia preta (Avena strigosa Schreb.) submetidas a diferentes concetrações de zinco

Abstract

In Brazil, pig farming plays a fundamental role in agribusiness, mainly due to the great production potential. However, the application of swine manure is the main source of zinc bioaccumulation in agricultural soils, and it is important to evaluate its behavior in soils and plants. The experiment was conducted from April 07 to April 14, 2022, in the seed and grain laboratory of the Federal University of Fronteira Sul Campus Chapecó, under a split-plot scheme in time, in a randomized block design (DBC), with cross-classification , with 4 lots of 16 repetitions of 50 seeds each. The different lots were sown on germination paper and these were soaked with deionized water added with different concentrations of zinc sulfate (ZnSO4) so that the final concentrations of zinc were 0, 100, 200 and 400 mg L-1, generating four different treatments. The paper rolls were kept in a germinator under lighting and a constant temperature of 25ºC, and the evaluations of percentage of germination, growth of shoots, roots and speed of germination were carried out in 4 repetitions of each treatment, taken randomly in the room , fifth, sixth and seventh day after sowing. The different doses of zinc affected the germination potential of black oats in relation to the different doses tested, which did not occur for the variable days of evaluation. It was possible to observe a significant difference in the evaluations of shoot growth, in the highest doses of zinc (200 and 400 mg L-1), causing a delay in shoot growth, especially on the fifth, sixth and seventh day. Regarding root growth, there was a paralysis in root growth on both evaluation days for both doses, with the exception of 0 mg L-1. And in relation to the speed of germination, the doses tested did not show any effects. The control (0 mg L-1) was the treatment that presented the best performance during the evaluations, proving that zinc, in high concentrations, impairs the development of black oats.