Published in Scientific Papers. Series B, Horticulture, Vol. LXVI, Issue 1
Written by Milena Yordanova, Zhelyu Avramov, Nidal Shaban
The aim of our study was to test some varieties of lettuce in unheated greenhouse (high tunnel) for the winter growing with November transplanting. The experiment was carried out in the period 2015-2016 in the experimental field on University of Forestry - Sofia (42° 7′ N, 23° 43′ E). Were selected 19 cultivars (16 Batavia and 3 Lollo types) with different requirements for the terms and conditions of cultivation. The seedlings were planted on the block method with four replications in the second ten days of November in polyethylene greenhouse. Until the time of harvesting, four surveys have been made on the percentage of rooted and dead plants. During the harvesting of production (second ten days of March - early April) were made biometric measurements (diameter and average weight per plant). Several cultivars for winter indoor cultivation were highlighted: 6 from Batavia, all of Lollo, and two from Batavia for outdoor. Regardless of recommendations given for each cultivar it needs they to be screened for each region, microclimate and growing period.
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