Measurement of Temperature and Humidity in Tobacco Plots in Rhodesia

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Abstract
Small nickel resistance thermometers were tested in various anti-radiation screens over bare sandy soil in Southern Rhodesia. Satisfactory results were obtained only when the thermometers were aspirated in small chromed metal shields, based on the design of the Mark 3 Assmann psychrometer. The aspirated units were compared with an Assmann, at various heights within tobacco plots during a range of whether conditions, and grave satisfactory results when used for continuous periods of several months. Some results are presented illustrating the vertical distribution of temperature and humidity within tobacco plots at different stages of growth. When plants were small, temperature and humidity gradients appeared to be similar to those that might be expected over open ground. Later the pattern resembled that of a crop of medium ground cover and density.

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