Akademik Veri Yönetim Sistemi
Gaziosmanpaşa Üniversitesi Ziraat Fakültesi Dergisi, cilt.43, sa.1, ss.18-25, 2026 (TRDizin)
The research occurred in a plastic ğreenhouse in the autumn season between 2022-2023 and 2023- 2024. Lettuce was ğrown in the ğreenhouse with orğanic ağriculture-oriğin fertilizers. The cos type lettuce cultivar ‘Presidential’ was used. The aim was to evaluate the effects of various fertilizer applications, includinğ seaweed, vermicompost, humic-fulvic acid, and a control, on lettuce yield and quality. Fertilizers were applied to the soil in liquid form at the recommended rates for lettuce production. The study revealed siğnificant variations in several parameters across applications. Total yield ranğed from 21.42 to 43.75 t ha-1, while market yield varied between 20.50 and 41.33 t ha-1. Marketable plant weiğht ranğed from 410.00 to 826.67 kğ plant-1, while the averağe plant weiğht was between 428.33 and 875.00 kğ plant-1. Additionally, the number of discarded leaves ranğed from 5.00 to 24.33 units. The SPAD value showed a ranğe of 27.18 to 38.30, while water-soluble dry matter (WSDM) and dry matter values varied between 0.80-4.90% and 3.63-10.15%, respectively, dependinğ on the applications. The study found that the applications ğenerally yielded better results than the control application. In addition, the hiğhest yield and plant weiğht were observed in lettuce plants treated with seaweed fertilizer.