A null balance method for measuring crop photo-synthesis in an airtight daylit controlled-environment cabinet
✍ Scribed by D.W. Hand
- Publisher
- Elsevier Science
- Year
- 1973
- Weight
- 726 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0002-1571
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✦ Synopsis
Hand, D. W., 1973
. A null balance method for measuring crop photosynthesis in an airtight daylit controlled-environment cabinet. Agric. Meteorol., 12: 259-270.
A technique is described for measuring the net canopy photosynthesis of crop stands over periods of 10 rain in a near airtight, daylit controlled-environment cabinet. The accuracy of control of the CO 2 concentration in the cabinet is usually within -+0.5% of the desired value. The amounts of CO 2 used in crop photosynthesis are measured with a linear mass flowmeter accurate to within -+ 10 mg CO 2 . The total errors incurred in measuring net rates of canopy photosynthesis are estimated to be of the order of -+ 0.75% to -+2.5%.
Records from preliminary trials on tomato in the cabinet are presented as an example of what can be achieved experimentally with the technique.