TEMPERATURE 



297 



Minimum, Optimum, and Maximum Temperatures far Germination oj Various 

 Seeds as Determined by Different Investigators (Degrees Fahrenheit) 



By consulting the following table it will be seen that we 

 long ago adapted our agricultural practices to conform in a measure 

 to the temperature requirements of plants for germination. The 

 temperatures for growth are very similar to those for germination. 



Time Requited fen Appearance of Radicle at Different Temperatures 5 



It will be seen from the preceding table that the time for germi- 

 nation is controlled largely by the temperature and emphasizes the 

 necessity of not seeding until the temperature is high enough. 



2. Temperature for Growth.- With most plants, and espe- 

 cially with our cultivated ones, growth does not begin until a tern- 



