PLATE 2 
INFLUENCE OF SOIL TEMPERATURE AND SOIL MOISTURE UPON 
THE NORMAL DEVELOPMENT OF CABBAGE PLANTS 
Note the progressive increase in size corresponding to rising temperatures. 
The plants were grown eight weeks, at the soil temperatures indicated, in a 
muck soil similar to soil B of text (page 552) but free from infection with the club- 
root organism. The air temperature for all alike was about 15° C. Plants in 
the upper group were grown in soil kept uniformly at high moisture content, 
that is 90 per cent of the water-holding capacity. Those below were grown in 
soil kept at a moisture content of 45 per cent of the water-holding capacity. 
When transplanted into this soil the plants were almost as large as those shown 
at 6° C. Very little growth occurred at that low soil temperature. 
Note the somewhat larger plants grown in the soil with increased moisture. 
