290 SOILS: pbopi:rtibs 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^ 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 Tbmpeeatuee to the Geemination of 



Ceetain Seeds (in Degeees Faheenheit) 





Minimum 



Optimum 



Maximum 



Corn 



49 



93 



115 



Scarlet bean 



49 



93 



115 



Pumpkins 



52 



93 



115 



Wheat 



41 



84 



108 



Barley 



41 



84 



99 



The Relation of Tempeeatuee to the Geowth of Ceetain 

 Plants (in Degeees Faheenheit) 



Wheat . 

 Barley . 

 Corn 

 Jl eas • > 

 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 ftir die Keimung der Wiehtigeren Landwirthschaftlichen 

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

 1874. 



