Incremento na concentração do potássio nos tecidos da soja (Glycine max) através da aplicação de fertilizante foliar

Abstract

Soybean (Glycine max) spread and became cultivated in several countries, due to its great nutritional capacity. The productive growth of soybeans is due to technological advances in agriculture, including the technique of foliar fertilization, which has a fast absorption capacity by the leaf, however, it is still surrounded by uncertainties among the research carried out on its efficiency. Thus, the present work evaluated the concentration of Potassium (K) in the leaves, through the increment of nutrients via the leaves. The experiment was carried out in the post-harvest laboratory and in the greenhouse of the Universidade Federal da Fronteira Sul, at the Campus of Laranjeiras do Sul/Paraná, conducted from October 19, 2021 to February 3, 2022. Being used 42 pots, we divided into three treatments. The treatment 1 was witness, being the application, in the plants, with water in the volume of 10ml. Treatment 2 was the application of calcium (Ca) in the plants at a concentration of 19.80ppm with water in a volume of 10ml. Treatment 3 was the application of Potassium (K) in the plants at a concentration of 215.6ppm with water in a volume of 10ml. The applications in the treatments were carried out fortnightly, with the first spraying carried out on 11/09/2021 and ending with the 4th spraying on 01/09/2022. The collection of samples was careful and obtained considering the representativeness, then the leaves were washed for disinfestation, dried and packed in paper bags for drying in an oven, after drying, grinding was performed and stored in plastic pots. The digestion of the samples was nitric-perchloric and the determination of potassium concentration was performed in a flame photometer, using a standard solution of 1,000mg L-¹ of K and a standard solution of 25mg L-¹ of K. The results obtained were T1. 6.49, T2. 7.03, and T3. 7,36 and showed that the leaves did not significantly increase the concentration of potassium, regardless of its application. However, there is a difference in potassium content in leaf tissue when the nutrient is applied, but this increase does not differ significantly.