290 SOILS: PROPERTIES AND MANAGEMENT 



also to govern the time when his sowing and planting are 

 performed in such a way that the soil will be fitted, at 

 least as far as heat is concerned, for proper seed germina- 

 tion and plant growth. 



207. Relation of heat to germination and growth. — 

 In order to show the exact relationship of heat to ger- 

 mination of seeds and to the growth of plants, the follow- 

 ing data from Haberlandt l are given. While these 

 tables are not exact, they show clearly the necessity of 

 careful control of temperature in the propagation of 

 plants : — 



The Relation of Temperature to the Germination op 

 Certain Seeds (in Degrees Fahrenheit) 



The Relation of Temperature to the Growth of Certain 

 Plants (in Degrees Fahrenheit) 



Wheat . 

 Barley . 

 Corn 

 Peas . . 

 Buckwheat 

 Melon . 

 Pumpkin 



Minimum 



32-40 

 32-40 

 40-51 

 32-40 

 32-40 

 60-65 

 51-60 



Optimum 



77-88 

 77-88 

 88-98 

 77-88 

 77-88 

 88-98 

 98-111 



Maximum 



88-98 

 88-98 

 98-111 

 88-98 

 98^-111 

 111-122 

 111-122 



1 Haberlandt, F. Die Oberen und Unteren Temperatur- 

 grenze fur die Keimung der Wichtigeren Landwirthschaftlichen 

 Samereien. Landw. Versuchs. Stat., Band 17, Seite 104-116. 

 1874. 



