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United States Department of Agriculture

Agricultural Research Service

Monitoring Plant Growth In A Controlled Environment
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At the heart of mechanistic, process-level, crop simulation models are rate equations that describe the physiological responses of crop plants to environmental variables.In order to develop these rate equations, experiments are conducted under carefully controlled environmental conditions.

Open Top ChamberOpen Top Chamber

Experiments are performed in controlled environment chambers, glasshouses and field plots.

Inside Lamplit Chamber

 

 

 

 

 

 

Outdoor, naturally sunlit, plant growth chambers referred to as SPAR (Soil Plant Atmosphere Research) units provide precise control of the major environmental variables influencing crop growth including temperature, humidity and atmospheric carbon dioxide concentration.


Daylit ChamberSoilbin Chamber

 

 

 

 

 

The SPAR units are fully automated to measure crop
canopy gas exchange, including photosynthesis, respiration, 
transpiration and water use efficiency.

 


Last Modified: 2/22/2007