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Potassium (K) is one of the most abundant nutrient and has the greatest influence on fruit quality as it regulates the synthesis and translocation of photoassimilates in plants. K deficiency in tomato plants can compromise the quality and flavor of fruits. Thus, the objective of this work was to evaluate the effect of K doses on the production and quality of cherry tomato fruits in a hydroponic system. We cultivated the cherry tomato Hybrid Sindy for 120 days, from June to October, in an expanded clay sub irrigation system. The experiment was arranged in a completely randomized design with four replicates. The treatments consisted of increasing concentrations of K (6, 8, 10 and 12 mmol L-1) in the nutrient solution provided during the fructification period. It was evaluated production, mean weight of fruits and bunch, total soluble solids contents, titratable acidity, pH, and contents of lycopene, beta-carotene, and 'a' chlorophyll. The contents of nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, copper, boron, iron, zinc, and manganese were also determined in the fruits and in the third leaf above the fourth fruit bunch. Six mmol L-1 of K in the nutrient solution was enough to ensure the production and quality of the Sindy hybrid cherry tomato. Nevertheless, higher K doses improved the contents of the bioactive compounds lycopene and beta -carotene in the fruits.

Sindy cherry tomato: A low potassium (K) demanding, high-quality and highly productive cultivar