Germinação de sementes e crescimento de plântulas de aveia preta sob diferentes concentrações de cobre

Abstract

Copper, a micronutrient present in soils, due to anthropogenic action has been reported in toxic concentrations. Black oat is widely used in crop rotation, and to obtain increases in productivity, the factors that interfere with cultivation have been evaluated. The objective of the present work was to verify the effects of toxic and subtoxic copper concentrations on the germination and growth of black oat seedlings. A split-plot trial was carried out in randomized blocks with 4 replications. The seeds of the cultivar Iapar 61 (Ibiporã) were divided into 4 lots of 16 replicates of 50 seeds and each replicate sown in a germination paper substrate, previously moistened with a volume of water corresponding to 2.5 times the weight of the paper. The water used for the imbibition of the 4 batches was added with different concentrations of copper sulfate (CuSO4), so that the final concentrations of copper were 0.0, 50, 100.0 and 150.0 mg/L, generating four different treatments. The paper rolls were kept in germinators at a constant temperature of 25ºC, and evaluations were carried out in 4 repetitions of each treatment on the fourth, fifth, sixth and seventh day after sowing. Copper did not interfere in germination capacity, but in the size of roots and shoots at all concentrations tested. The control sample, which did not contain copper, showed the best values for all factors evaluated.