APPARATUS FOR GROWING PLANTS UNDER CONTROLLED ENVIRONMENTAL CONDITIONS

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Abstract
SUMMARY: Details are given of modifications of a Eothamsted Controlled Environment Chamber. These include an inexpensive cooling apparatus depending on the circulation of air through a car radiator through which cold or iced water is circulated by an electrically operated centrifugal pump. This apparatus enables temperatures down to 5° C. to be maintained at a room temperature of 16–18° C.Two types of humidifier are described. That finally adopted depends upon the passage of air through a fine water mist created by an atomizing device, the temperature of the water being maintained a few degrees above that of the air in the chamber.A method of drying air by passage over calcium chloride is described.Details of an inexpensive, simple and accurate, lineametric hair‐operated hygrostat are given. This instrument controls humidity within 2%Various minor modifications such as rough control of wind velocity within the chamber and a semi‐automatic watering device are described.

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