Lettuce Handbook

Set Points

Temperature
Recommended Set-Point: 24^o C (75^o F) Daytime 19^o C (65^o F) Nighttime

Relative Humidity
Recommended Set-Point: 30% to 70%

Carbon Dioxide Concentration
Recommended Set-Point: 1000 ppm when light is available for photosynthesis and ambient 350 ppm levels during dark hours

Light
Recommended Set-Point: 17 moles/m^-2d^-1 as a combination of solar and supplemental light

Dissolved Oxygen (DO)
Recommended Set-Point: above 4 mg/L

pH
Recommended Set-Point: 5.6 to 6.0

Electrical Conductivity (EC)
Recommended Set-Point: 1150 - 1250 microS cm^-1