140 RELATIONS OF SOIL TO HEAT 



Loivest Temperatures for Germination 



Wheat, Barley, Oats, Rye, Buckwheat, Rye Grass, Peas, \ 



Beans, Vetches, Lupins, Red Clover, Lucerne, Mustard, I 32 - 40 F. 



Rape, Turnip, Beet, Hemp, Flax J 



Maize, Sorghum, Timothy Grass, Sanfoin, Carrot, Sunflower 40-51F. 



Tomato, Tobacco, Pumpkin 51-60F. 



Cucumber, Melon 60-65F. 



The time required to produce germination becomes shorter 

 as the temperature rises, until the optimum temperature is 

 passed. Haberlandt's results were as follows : 



Days required for first appearance of Radicle at various 

 Temperatures 



40 51 60 65 F. 



1 ... 1 



2 ... 1| 

 2| ... 2 

 3| ... 3 

 11 ... 11 

 2 ... 2 

 21 ... 2 

 11 ... 1 

 4f ... 41 

 1 ... 1 



1 ... 1 



2 ... 1| 

 31 ... 3| 



2 ... 2 

 31 ... 3 

 31 ... 3 

 41 ... 31 

 3 ... 3 



3 ... 2 

 6 ... 31 

 9 ... 61 



101 ... 4 



The temperature at which germination was most speedy, 

 and the largest proportion of seeds germinated (optimum 



