Role of Seaweed Extract (Stimax Nature) and Trichoderma Fungus on Productivity Traits of Two Lettuce Cultivars

Abstract

The study was conducted during the 2024–2025 growing season in the field of the Horticulture Department, located in the Forests Tourist Area. The experiment included three factors: First factor: Seaweed extract (Stimax Nature) applied at three concentrations: 0 ml L⁻¹ (control), 5 ml L⁻¹ and 10 ml L⁻¹ . The extract was sprayed at four growth stages: first stage occurred two weeks after transplanting, and the subsequent three sprays were applied at 14-day intervals. Second factor: Trichoderma fungus (Trichoderma asperellum) applied at three levels: Without fungus (control), 1 g plant⁻¹and 2 g plant⁻¹. The fungus was added into the planting hole 10 days before transplanting. The seedlings were then transplanted such that the fungus was positioned beneath the root system of each plant. The fungus was added to the planting hole 10 days before transplanting. Seedlings were then transplanted with the fungus placed beneath the

root system of each plant. Third Factor: Lettuce Cultivars
This factor included two imported lettuce cultivars: Nader and Fajer The experiment included 18 treatments (3×3×2) with three replications conducted as a factorial experiment using a Randomized Complete Block Design (RCBD). Treatments were randomly distributed according to the experimental design. The results were statistically analyzed according to the adopted design, and means were compared using Duncan’s Multiple Range Test at a significance level of 0.05.