Ecological plasticity of lettuce varieties (Lactuca sativa L. var. angustana Jorish) in the Western Forest-steppe of Ukraine

Purpose. To reveal the adaptive potential of stem lettuce varieties (Lactuca sativa L. var. angustana Irish) accor­ding to parameters yield, ecological plasticity, stability and adaptability in conditions Western Forest-Steppe Ukraine. Methods. The plasticity yield was evaluated according S. A. Eberhart W. Rassel method. Soil climatic research area were generally favorable for growth development. Research methods: field, laboratory statistical. Results. Stem showed different duration interfacial period germination – technical ripeness: ‘Pogonych’ variety it 35 days, which made possible collect marketable products 6 days earlier than control. ‘Cobra’ largest leaf (13 109.12 m2). value index rosette leaves stems over years range 53.2–57.0 t/ha. Variety highest rates Yp.p. Yd. 74.0 7.8 t/ha, respectively. had a high coefficient agronomic > 70%. ‘Tseltus’ environmental (bi = 1.07), indicates its sensitivity demonstrated plasticity. Conclusions. tolerance stressful Ukraine, but less constant limits soil factors. High homeostaticity inherent all studied varie­ties, higher, 70% stability, namely: ‘Pogonych’, ‘Tseltus’.