Effect of Different Irrigation Levels on Some Lettuce (Lactuca sativa) Varieties Grown in Kocaeli Conditions

In this study, the effects of different irrigation levels on some lettuce cultivars were investigated. The research was conducted under greenhouse conditions in Kocaeli province during the 2020-2021 growing season. In the experiment, a split-plot design in randomized blocks was used. Varieties (Carteganas, Concorde, and Melina) were in the main plots, and five irrigation levels (0.25 E, 0.50 E, 0.75 E, 1.00 E, and 1.25 E) were created by taking the amount of water evaporated (E) from a 100 ml glass petri dish as a reference in the sub-plots. Head weight, diameter, length, root length, and leaf number values showed statistically significant (P