Optimal environmental conditions for crop growth in Growing Underground
| Environmental factor | For lettuce, from literature | Adapted values for Growing Underground |
|---|---|---|
| Temperature | Between 20 and 25°C, optimal water and air at 24 °C (Thompson and Langhans, 1998) | Night time: 17-22°C |
| Daytime: 21-26°C | ||
| Relative Humidity | Between 60 and 80% | Between 45 and 65% |
| CO2 concentration | Keep above 400ppm, optimal at 1000ppm, carbon enrichment only with less than 3.5 ACH | Keep air change per hour as low as possible (measure is ventilation setting) |
| Air current speed | Significant yield improvements from 0.01 to 0.2 m/s, | By location: 1 m/s through the corridor yields 0.1-0.3 m/s over the crops on most shelves |
| No significant change past 0.5 m/s | ||
| Light | High LUE at early growth stages | Data not available yet, currently 18 hours. |
| Photoperiod of 18 hours optimal (Tei, Scaife and Aikman, 1996) |
| Environmental factor | For lettuce, from literature | Adapted values for Growing Underground |
|---|---|---|
| Temperature | Between 20 and 25°C, optimal water and air at 24 °C (Thompson and Langhans, 1998) | Night time: 17-22°C |
| Daytime: 21-26°C | ||
| Relative Humidity | Between 60 and 80% | Between 45 and 65% |
| CO2 concentration | Keep above 400ppm, optimal at 1000ppm, carbon enrichment only with less than 3.5 ACH | Keep air change per hour as low as possible (measure is ventilation setting) |
| Air current speed | Significant yield improvements from 0.01 to 0.2 m/s, | By location: 1 m/s through the corridor yields 0.1-0.3 m/s over the crops on most shelves |
| No significant change past 0.5 m/s | ||
| Light | High LUE at early growth stages | Data not available yet, currently 18 hours. |
| Photoperiod of 18 hours optimal (Tei, Scaife and Aikman, 1996) |
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