A chamber for the simulation of radiation freezing of plants
Article first published online: 28 JUN 2008
Annals of Applied Biology
Volume 133, Issue 1, pages 111–121, August 1998
How to Cite
FULLER, M. P. and GRICE, P. L. (1998), A chamber for the simulation of radiation freezing of plants. Annals of Applied Biology, 133: 111–121. doi: 10.1111/j.1744-7348.1998.tb05807.x
- Issue published online: 28 JUN 2008
- Article first published online: 28 JUN 2008
- Accepted 10 June 1998, Received 16 February 1998
- radiation freezing
Frost injury to plants can occur following episodic radiation frosts. In the UK this is particularly important to spring sown crops such as potatoes. Most laboratory based frost studies simulate freezing using either conductive or convective freezing chambers. Such frost tests do not simulate overnight freezing events adequately.
A freezing chamber based on radiative cooling is described which mimics overnight radiative freezing. The chamber is rectangular in design (1 m × lm × 2 m high) with a radiative cooling plate at the top of the chamber cooled to -40°C to -45°C using HFC coolants, which acts as a cold black body. The sides of the chamber are also cooled to variable temperatures down to -5°C in order to prevent the chamber walls radiating to the plant material during testing.
Using thermocouples to measure air temperature and plant temperature the chamber has been characterised to simulate the radiative cooling conditions found in the UK during autumn and spring. Exotherm detection upon plant freezing is simplified by virtue of the reduction in temperature fluctuation normally experienced at the plant surface during natural freezing. Radiation frosts and subsequent frost damage to potatoes have been recorded in the temperature range -4°C to –5°C. The equipment is recommended for studies of frost damage to plants normally caused by episodic radiation frost events.