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The availability of nitrogen (N) and potassium (K) and the adequate ratio between the two are of great importance for processes such as growth and development of plants. The purpose of this paper was to evaluate the effect of sources and doses of K in association with N in foliar cover on wheat (Triticum aestivum L.) production grown under notillage system after soybean crop. The experiment was carried out in 2018 in the municipality of Juranda, central-western region of Paraná. The study used an experimental design in randomized blocks in a 5 x 1 factorial scheme, with 6 replicates, totaling 30 experimental plots, K and KN in combination, different phenological phases, V5 (rubberizing) and R7 (grain filling) phases. Ear size, grain per ear, and grain weight were assessed to evaluate the real benefits of foliar application of potassium fertilization. For the number of ears, treatment only with K during filling did not differ from the control; for number of grains per ear, the best results were obtained in K in the rubberizing, and K and N in the filling stages. However, for the weight of thousand grains, K in the filling stage presented the best mean (40.75 g plant-1) in the control ratio. It can be concluded that the use of K via foliar application increases the length of the ear, number of grains and weight per thousand grains. Application of the commercial product K-40 at the R7 stage increases yield by about 30%.

ADUBAÇÃO FOLIAR E VIABILIDADE ECONOMICA DE POTÁSSIO NA CULTURA DO TRIGO (Triticum aestiavum L.).