I had a 1 by 2 meter white flood tray with a .135 M3 reservoir, with 32 plants in it. It was a mix of sativas and indicas. We had a ventilation setup and CO2 hooked up with a timer. I used a 600 watt HPS lamp on a Light Rail.

I had a 1 by 2 meter white flood tray with a .135 M3 reservoir, with 32 plants in it. It was a mix of sativas and indicas. We had a ventilation setup and CO2 hooked up with a timer. I used a 600 watt HPS lamp on a Light Rail. The temperature was kept at 22 degrees and humidity at 50 percent. My harvest was only 225 grams. How can I increase my yield?
Oscar

Part of the reason that the plants had a low yield is that their growth rate was slowed because of the low temperature. As far as temperature is concerned, plants function in much the same way as cold-blooded animals; their metabolism is affected by the temperature. When the temperature is cool, plants' rate of metabolism and photosynthesis is slow even if all other conditions-light, water, nutrients and CO2-are abundant. With the high light and high CO2 conditions in your garden, the growth rate will increase considerably when you raise the temperature to about 27 to 30 degrees. That's an approximation. Use a surface temperature thermometer to read the temperature. Then maintain the leaf temperature at about 30 to 32 degrees by adjusting the room temperature.

Another reason the yield might be low is the varieties of plants that you grew. Since you were growing a garden of mixed sativas and indicas, the sativas may have towered over the indicas, shading them and thwarting their growth. For best yields row plants that have similar growth characteristics.

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