University of Tehran International Journal of Horticultural Science and Technology 2322-1461 11 4 2024 12 01 Nutrient Uptake, Fruit Quality, and Yield of Greenhouse Tomato (Solanum lycopersicum, cv. Hirad) as Influenced by the Interaction of Nitrogen and Potassium 523 532 95848 10.22059/ijhst.2024.362151.666 EN Saeed Alah Tavakoli Islamic Azad University, Jahrom Branch, Jahrom, Fars, Iran Abdolhossein Abootalebi Jahromi Islamic Azad University, Jahrom Branch, Jahrom, Fars, Iran 0000-0001-5114-9049 Abdolrasoul Zakerin Islamic Azad University, Jahrom Branch, Jahrom, Fars, Iran Abdolkarim Ejraei Islamic Azad University, Jahrom Branch, Jahrom, Fars, Iran Hamed Hassanzadeh Khankahdani Agricultural Organization Fars, Shiraz, Fars, Iran 0000-0002-2679-4561 Journal Article 2023 07 12 Plant growth in hydroponic systems is affected by the nutrient solution concentration. The present study evaluated the effects of nitrogen (N) and potassium (K) on the concentration of some nutrients, chemical fruit qualities, and yield in tomatoes (Solanum lycopersicum, cv. Hirad). The experiment was arranged as a completely randomized design with four treatments (T1: N160 + K350 ppm at the vegetative stage and N130 + K250 ppm at the reproductive stage, T2: N170 + K360 ppm at the vegetative stage and N140 + K260 ppm at the reproductive stage, T3: N180 + K370 ppm at the vegetative stage and N150 + K270 ppm at the reproductive stage and T4: N190 + K380 ppm at the vegetative stage and N160 + K280 ppm at the reproductive stage). Results indicated that higher N and K supplies in the nutrient solution<br />decreased Ca, Na, Mn, and Zn concentrations in leaf samples. In contrast, the concentration of various elements in fruits was unaffected by the increase in N and K (except for Cu). The second treatment (T2) had the most beneficial effect on the Cu concentration in tomato leaves and fruits. The increase in total soluble solids, chlorophyll, lycopene, and total acids could improve fruit quality in tomato fruits. The best treatment in the present study was N170 + K360 ppm at the vegetative stage and N140 + K260 ppm at the reproductive stage. https://ijhst.ut.ac.ir/article_95848_daabb92f8006f1c30ce11b2370aba5a4.pdf