. 2022 May 3;11(9):1327. doi: 10.3390/foods11091327

Table 1.

Parameters defined for different species of microgreens continuously monitored and controlled.

No.	Parameter	Unit of Measurement	Average Value of Parameters for Example Species ***
No.	Parameter	Unit of Measurement	Basil	Lettuce	Brussels Sprouts
1	Light	W	400	400	400
1.1	Photoperiodicity	h	06:30–21:30 (15 h) (10–20 h)	07:00–20:00 (12 h)	07:00–20:00 (12 h)
1.2	Light intensity	μmolm⁻²s⁻¹	300 (200–400)	500	300 ± 15
1.3	Color spectrum	nm	440–460 (260–780)	440–460	400–700
1.4	Distance from light	cm	150—Lamps HPS * 40—Lamps LED *	150—Lamps HPS 40—Lamps LED	150—Lamps HPS 40—Lamps LED
2	Ambient air temperature	°C	21 ± 2 Day/17 Night	20 ± 2	24 Day/18 Night ± 2
3	Relative humidity	%	65 ± 5 (50–60)	80 ± 5	70/80% ± 5
4	Nutrient concentration	N-P-K: 3-2-3 (%)	changed every 10 days **	changed every 10 days	changed every 10 days
5	pH	pH units	6.8 ± 0.4	6.3 ± 0.4	6.0 ± 0.2
6	Electrical conductivity	mS	1.2 ± 0.2	1.8 ± 0.2	1.8 ± 0.2
7	Dissolved oxygen	mgL⁻¹	6.5	6	6
8	Solution temperature	°C	20 ± 2	18 ± 2	20 ± 2

Note: * HPS-High Pressure Sodium; LED-Light emitting diodes. ** 8 o’clock in the morning; *** monitor daily at 8 o’clock in the morning in 3 repetitions.