The Greenhouse Effect - Georgia State University
Furthermore, a new fluorescence sensor is developed, which determines the efficiency of photosynthesis. This new sensor provides short light pulses from the top of the greenhouse. The fluorescence signal is then measured by the sensor, which is programmed to measure various spots in a surface of 3 x 3 m. Since the measurements are fast, the sensor provides a good image of the crop photosynthesis in a short period of time. The results of the sensor will be compared to data of small fluorescence sensors which will be placed at different heights in the canopy to give a picture of the efficiency of crop photosynthesis.
How to select the best Grow Light for your greenhouse
The normal level of CO2 in the atmosphere is about 350 ppm. Research on many crops has shown that if the ambient level of CO2 is increased to 800 to 1000 ppm, increased plant growth and yield will result. Injection of CO2 is a standard practice in winter greenhouse vegetable production in northern climates. In these climates, high CO2 levels can be maintained because the greenhouses are closed during the winter. In Florida, CO2 injection is not as efficient as in northern climates because of the large amount of ventilation required, even in winter.
The first sensor is the crop photosynthesis monitor. This is a soft sensor that calculates the CO2 uptake of the entire greenhouse. The monitor is based on the CO2 balance of the greenhouse. On the one hand, CO2 is added to the greenhouse via CO2 supply. On the other hand CO2 is lost via ventilation, changes in CO2 concentration and crop photosynthesis. By measuring the CO2 concentration and determining the ventilation loss, crop photosynthesis can be calculated. By doing manual measurements of leaf photosynthesis as well, and scaling these up to crop photosynthesis by a crop growth model, the crop photosynthesis monitor can be validated.
Welcome to Jolly Lane Greenhouse
The greenhouse effect refers to circumstances where the short wavelengths of light from the sun pass through a medium and are absorbed, but the longer wavelengths of the re-radiation from the are unable to pass through that medium. The trapping of the long wavelength radiation leads to more heating and a higher resultant temperature. Besides the heating of an automobile by sunlight through the windshield and the namesake example of heating the greenhouse by sunlight passing through sealed, transparent windows, the greenhouse effect has been widely used to describe the trapping of excess heat by the rising concentration of in the atmosphere. The carbon dioxidestrongly absorbs infrared and does not allow as much of it to escape into space.