<![CDATA[Zucchini (Cucurbita pepo L. var. cylindrica) is a horticultural crop with economic potential and increasing market demand. Improving zucchini growth and yield requires appropriate nutrient management and the application of plant growth regulators. This study aimed to evaluate the effects of Mono Potassium Phosphate (MKP), gibberellic acid (GA₃), and their interaction on zucchini growth and yield. The study was conducted from March to June 2026 at the Smart Farming Greenhouse, Gunadarma University Technopark, Cianjur, West Java. A factorial Randomized Complete Block Design was used, consisting of three MKP concentrations (0, 6, and 9 g L⁻¹) and three GA₃ concentrations (0, 150, and 300 ppm), with four replications. Data were analyzed using analysis of variance (ANOVA), followed by Duncan’s Multiple Range Test (DMRT) at the 5% significance level. The results showed that MKP significantly affected several growth and flowering parameters, while GA₃ significantly affected the number of leaves, male flowers, and female flowers at specific observation times. GA₃ at 150 ppm produced the highest number of female flowers, averaging 3.84 flowers. No significant interaction between MKP and GA₃ was observed, and neither treatment significantly affected first harvest age or fruit quality. Overall, the effects of MKP and GA₃ were parameter- and growth-stage-specific.]]>
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