Growth and Yield Response of Several Zucchini (Cucurbita Pepo L) Varieties to Auxin Application in The Midland in Tropical Area

Zucchini (Cucurbita pepo L.) is a short-lived vegetable plant with a harvest period ranging from 28 to 60 days after planting. It offers health benefits and has the potential for development in Indonesia, although it faces challenges, particularly because it thrives better in highland areas. This research aims to identify adaptive zucchini varieties for medium-altitude areas and evaluate the effect of auxin (IAA) on the growth and yield of zucchini in these regions. The study employed a split-plot design, with the main plots being varieties (P1, P2, P3) and the subplots being auxin concentrations (A0, A50, A100, A150 ppm). Observed variables included plant length, leaf number, stem diameter, leaf area, flowering age (male and female), number of flowers (male and female), number of fruits per plant, fruit weight per plant, as well as fruit length and diameter. The results indicated that the Carissa variety adapted best, producing a fruit weight per plant of 1,067.40 g. Additionally, auxin application increased the fruit weight per plant compared to those without auxin.