Potato is considered one of the few foods able to nourish the growing world population for being a source of energy and containing high levels of proteins, vitamins, and minerals. However, these compounds suffer influence of several factors such as the use of cultivars, soil and climate characteristics, crop, harvest, and storage. Hence, the present paper aims to determine the potato chemical composition (cvs. Atlantic, Asterix, Innovator and Shepody), grown under four different levels (0, 120, 360 and 1080 kg K2O.ha-1) and two different sources of potassium (KCl e K2SO4). Samples of crop water production were collected from a farm in the city of Fazenda Rio Grande/PR, Brazil. The following criteria were determined: vitamin C, moisture, proteins, fat, ashes, carbohydrates, energy, starch content, and potassium. The Atlantic cultivar presented the highest average ashes content (0.93%) and potassium (528.80 kcal.100 g-1); Asterix presented the highest moisture content (81.47%); Innovator presented the highest proteins (2.25%), fat (0.06%), carbohydrates (17.72%), energy (80.40 kcal.100 g-1) and starch content (16.45%); and the Shepody presented the highest vitamin C amount (31.01 mg.100 g-1). It can be concluded that the potato chemical composition depends on the potassium fertilization (level and source).
Solanum tuberosum; composition; potassium fertilization
