THE IMPACT OF RED AND FAR RED RATIO ON GROWTH AND DEVELOPMENT OF TOMATO (SOLANUM LYCOPERSICUM) TRANSPLANTS
The experimental data on growth and photomorfogenesis of tomato transplants (Solanum Lycopersicum var. Pinoccio) are presented. Investigations were carried out in a laboratory room without natural light. Plants were grown under LED emitters Ledel and Agro with irradiance 140 mmol.m-2.c-1.The dependence of the growth rate from the red (R) and far red (FR) ratio is stated. Within 48 days the day's increment of height under Agro was almost three times the increment under Ledel (9.6 mm vs. 3.6 mm). In comparison with the Ledel, plants under Agro had less leaves (10.2 %) and root (1.8 %), but, correspondingly, a large (12 %) of the stem weight fraction. Experiments have shown that decreasing the ratio R: FR from 2 to 15 the growth rate of the tomato transplants is increased by 2,4 times, the plant wet weight is increased by 23 %.