Published in Scientific Papers. Series A. Agronomy, Vol. LXIV, Issue 1
Written by Silvana Mihaela DĂNĂILĂ-GUIDEA, Gabriela NEAŢĂ, Paul-Alexandru POPESCU, Elisabeta Elena POPA, Mihaela-Cristina DRĂGHICI, Ricuța-Vasilica DOBRINOIU, Ioana-Cătălina NICOLAE, Valerica- Luminița VIȘAN
In this research, biochemical analyses were monitored by determination at the level of tomato plants and fruits, within a protected growing environment (vegetation house), before and after the application of light provided by LEDs in red, blue and monochrome white, in addition to natural light, during the summer (June, 3rd decade -August 3rd decade, 2019). In parallel with the analysis of tomato plants, the substrates from the pots corresponding to the plants were analyzed. Values obtained for tomato plants of the analyzed varieties (Solanum lycopersicum L. cv. ʻSonia de Buzauʼ, cv. ʻCoralinaʼ and cv. ʻHeraʼ) after 2 months of cultivation, regarding the content in mineral elements of non-metabolized forms (nitrates N-NO3, ppm (phosphates P-PO4, ppm, and K + ppm), showed a good supply of them, fact that determined their normal development in the protected cultivation area. The obtained biochemical results were situated within the limits accepted by the scientific literature, but were differentiated in correlation with the tomato genotype, LED light and daily exposure time, compared to control plants (unexposed to additional LED light). The fruits formed at the level of the first fruiting stage, toward the end of the experimental period, were analyzed together with the mineral elements and their contents in acidity %, soluble carbohydrates (%) and vitamin C (mg/100 g fresh product). The response to the applied treatment ensured uniform fruiting yield, after exposure to the treatment for 45 minutes/day with monochrome LEDs for all three colors, in the case of ʻCoralinaʼ tomato assortment, compared to the other 2 study varieties.
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