Effects of nutrient solution concentration and spraying interval on the growth of aeroponically grown potato (Solanum tuberosum L.) under greenhouse conditions at Tay Nguyen University
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Effects of nutrient solution concentration and spraying interval on the growth of aeroponically grown potato (Solanum tuberosum L.) under greenhouse conditions at Tay Nguyen University
Abstract
This study was conducted to determine the optimal nutrient solution concentration and spraying interval for the vegetative growth stage (0 - 30 days after planting) of the potato cultivar FL2215 in an aeroponic system. Two independent experiments were arranged in a Latin Square Design with three replications, carried out under greenhouse conditions at the Faculty of Agriculture, Tay Nguyen University. Morphological characteristics were periodically evaluated to analyze the developmental dynamics of the plants. The results indicated that a nutrient combination comprising 600 ppm of NPK macronutrients and 200 ppm of micronutrients created the most suitable osmotic pressure for root and canopy development. At 30 days after planting, this treatment recorded the maximum values for the number of emerged shoots (3.2 shoots/tuber), stem diameter (0.68 cm), and number of floral branches (2.2 branches/plant). Regarding the moisture and aeration regime, a spraying cycle of 4 hours/day (equivalent to a flow rate of 168 liters/day) facilitated the highest biomass accumulation, achieving a main stem height of 35.2 cm and a stem diameter of 0.93 cm. Increasing the total spraying duration to 5 - 6 hours/day tended to reduce internode elongation and stem diameter. The study initially affirms the feasibility of the established operational parameters for the FL2215 cultivar during the early growth stage. Furthermore, it is recommended to implement cooling solutions to control the nutrient tank temperature below 25°C to maintain dissolved oxygen levels, thereby preventing root-zone hypoxia under high thermal radiation conditions.
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