To obtain high-quality vegetable products in technological process of vegetable growing of protected soil, LED irradia- tion devices are used, the effectiveness of which is beyond doubt. It is established that to control the production process it is necessary to form a spectrum of phyto-emitters in a certain way, using different ratio of light-emitting diodes of blue and red wavelength ranges, as well as full spectrum of radiation. The aim of the study was to develop an effective irradiation technology for a salad culture based on LED phyto-emitters. Two irradiators were used in the experiment, one of which had radiation ratio in separate regions of photosynthetically active radiation: blue (b) - 24 %, white (w) - 27, red (r) - 49 %; another: b - 17 %, w - 17, r - 66 %. The average irra- diance was 150 μmol/m2s. As an experimental culture, two varieties of salad were used: "Krylda" and "Auvona." The yield, as well as the accumulation of macro- and microele- ments, were determined. Under the first irradiator, the yield of "Krylda" variety was 1.15 kg/m2 higher than under the second one. In "Auvona" variety, the yield was also higher under thefirst irradiator by 1.04 kg/m2, than under the second one.Bio- chemical analysis showed that an important advantage ofproperly formed full spectrum was a positive effect on bio- chemistry and morphology (the absence of form deviation) of plants. Thus, in "Krylda" salad grown under the first irradiator, the indicators of assimilation of macro- and microelements are within the norm. Under the second one, sodium content is exceeded by 70 % for the salad of the same variety, which could be the cause of salt balance infringement and as a result the change in leaf structure.
greenhouses, irradiation technology, LED- phyto-emitters, spectral composition of radiation, LED mod- ules, managed crop production, yield, plant quality
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