Articles
Effect of blue light percentage on mineral elements content in Brassica microgreens
Article number
1271_17
Pages
119 – 126
Language
English
Abstract
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 F1), 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.
Experiments were performed in controlled environment growth chambers.
Microgreens of mustard (Brassica juncea L. Red Lion), red pak choi (Brassica rapa var. chinensis Rubi F1), 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.
Authors
A. Brazaitytė, V. Vaštakaitė-Kairienė, J. Jankauskienė, A. Viršilė, G. Samuolienė, S. Sakalauskienė, A. Novičkovas, J. Miliauskienė, P. Duchovskis
Keywords
light-emitting diodes, blue light, microgreens, macro- and microelements, nitrates
Groups involved
- Division Greenhouse and Indoor Production Horticulture
- Division Precision Horticulture and Engineering
- Division Plant-Environment Interactions in Field Systems
- Working Group Nettings in Horticulture (subgroup of Protected Cultivation in Mild Winter Climates)
- Working Group Light in Horticulture
- Working Group Organic Greenhouse Horticulture
- Working Group Modelling Plant Growth, Environmental Control, Greenhouse Environment
- Working Group Protected Cultivation, Nettings and Screens for Mild Climates
- Working Group Vegetable Grafting
- Working Group Computational Fluid Dynamics in Agriculture
- Working Group Design and Automation in Integrated Indoor Production Systems
- Working Group Mechanization, Digitization, Sensing and Robotics
- Working Group Greenhouse Environment and Climate Control
- Commission Agroecology and Organic Farming Systems
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