Effect of blue light percentage on mineral elements content in Brassica microgreens
2020
Brazaitytė, A. | Vaštakaitė-Kairienė, V. | Jankauskienė, J. | Viršilė, A. | Samuolienė, G. | Sakalauskienė, S. | Novičkovas, A. | Miliauskienė, J. | Duchovskis, P.
The objective of our studies was to determine changes of mineral elements and nitrates content in Brassica microgreens depending on different percent of blue light in light-emitting diodes (LED) lighting. Experiments were performed in controlled environment growth chambers. Microgreens of mustard (Brassica juncea L. ‘Red Lion’), red pak choi (Brassica rapa var. chinensis ‘Rubi F(1)’), and tatsoi (Brassica rapa var. rosularis), were grown in a peat substrate (pH 5-6) in 0.5-L plastic vessels for 10 days, from sowing to harvest. Day/night temperatures of 21±2/17±2°C were established with a 16-h photoperiod and relative humidity of 50-60%. A system of five high-power, solid-state lighting modules with standard 445-, 640-, 660-, and 735-nm LEDs was used in the experiments. The spectral composition was changed by adding a blue component – 0, 8, 16, 25 and 33% – changing the PPFD level of red (640 nm) light. ICP-OES method was used for determination of mineral elements, potentiometric method – for nitrate content. Our results revealed that an increase of various mineral elements content was mostly caused by higher percentage of blue light. However, the changes on contents of mineral elements depended on microgreens species and percentage of blue light. The highest content of macro- and microelements was determined at 25% of blue light in mustard and at 33% – in red pak choi and tatsoi. The absence (0%) of blue light led to lower content of macroelements in red pak choi and tatsoi. The percentage of 25% led to significant lower nitrates content of all investigated microgreens.
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