Abstract:

Head lettuce was suffered harm and growth badly in high temperature environment cultivation. In order to provide high quality head lettuce varieties, eight varieties of head lettuce were compared, which planted in open country in summer and sunlight greenhouse in autumn. The seedling characters, economical characters, nutrients, production, and resistance were observed and studied. The results showed that the physiological indexes of head lettuce had differences in different cultivate environment. J42 was the best in seedling stage, and J44 was second. J42 and J44 were the best in leaf traits, maximum yield and resistance, W64 had no resistance, and the remaining varieties were moderately resistant varieties which had no serious feeling sick phenomenon. J42 had the best comprehensive nutrition quality, and the 8 varieties taste and texture was similar, all with a bitter taste, texture crisp. In a word, ‘King102’ (J42) and ‘Zaoyu heat lettuce’ (J44) had high yield, good traits, excellent quality and strong resistance, so they deserved to be promoted.