Agronomic evaluation of different lettuce (Lactuca sativa L.) varieties under unheated plastic tunnel

Among the leafy vegetables, lettuce (Lactuca sativa L.) is most widely grown species in world. Wide ranges of physical properties products are used to assess degree maturity. In this study, different varieties were under an unheated plastic tunnel springtime. We evaluated agronomic varieties, condition plants, and determined bioactive substances. Larger head weight can be achieved by ‘King May’ butterhead (259.31 g) ‘Great Lakes 659’crisphead (220.40 genotypes. A very strong correlation (r = 0.995) was observed between index, leaf index both had a positive 0.828 0.760) with NDVI. The highest SPAD values measured for cos ‘Romaine lettuce’ (44.01) iceberg 659’ (42.71). However, these genotypes showed (9.52%; 8.74%) dry matter content, too. red variety 'Lollo Rosso' total polyphenol content (181.53 GAE/100 g FW). properties, favorable morphology, plant condition, good content. addition, loose-leaf lettuces, lollo type outstanding