Ventilation

• Sunlight starts the process of photosynthesis, and the stoma opens and takes in carbon dioxide from the air. As photosynthesis continues through the day, the level of carbon dioxide is reduced in the greenhouse. Once this happens, the plant photosynthesis slows, and food energy suffers. Adequate ventilation is needed for fresh air from outside to flow in and replenish the used carbon dioxide. Ventilation also helps with temperature management.
  
  

Temperature

• Maintaining correct temperature for the plants is very important. When the plant is too hot, the stoma opens to let more moisture out on the leaves to evaporate in order to cool down. This reduces the ability to draw in carbon dioxide. When the plant is too cool, the stoma will close again, reducing the intake of carbon dioxide. Too much heat will also increase humidity, adding to the problem. Maintain the proper temperature for peek efficiency.
  
  

Humidity

• While plants need water, it should come from the soil, not the air. A humidity level between 25 and 80 percent will not harm the plants. Higher levels can restrict transpiration and lead to disease and stress that contributes to stunted growth. Controlling the heat, ventilation, along with circulating the air, with fans will cut down on humidity. Diseases thrive in damp stagnant air causing plant stems to become weak. Weakening a plant stops photosynthesis.
  
  

Light and Shade

• Plants, like all living organisms, need time to recuperate from the energy expenditures. Sunlight starts photosynthesis, and darkness stops it. Plants need the right amount of each for healthy growth. A system needs to be installed in the greenhouse that can provide shade from too much light. While plants need light, it also produces heat that raises temperatures, causing more transpiration to take place. Sunlight changes the temperature and air quality and needs to be controlled.