MODEL TESTS OF VAPOUR MOVEMENT IN SOIL 



75 



The extremely strong temperature gradients, however, existing within 

 the test sets were able to force so much water even out of the dry soil that 



8 days 



Fig. 5. Ecological effect of extreme temperature gradients on vapour movement and 

 condensation in soil with rooted plants. For key, see Fig. 3. Temperatures: test, base 

 38-5°C; test, top 4-5°C; control, base 38-5°C; control, top 30°C. 



