VOLUME LXIX NUMBER 2 



At. 



T HE <" 



Botanical Gazette 



FEBRUARY 1920 



FORMATIVE EFFECT OF HIGH AND LOW TEMPERA- 

 TURES UPON GROWTH OF BARLEY: A CHEMICAL 



CORRELATION 



CONTRIBUTIONS FROM THE HULL BOTANICAL LABORATORY 2 59 



H. L. Walster 

 (WITH EIGHTEEN FIGURES) 



Introduction 



Cereals are commonly considered cool temperature crops. 

 Cool seasons are known to favor cereal production, warm seasons to 

 hinder cereal production. Physiologists have correlated these 

 observations with the general effects of temperature upon the 

 growth and maturation of the crop, but have given little attention 

 to possible effects of the initial germination temperature upon the 

 subsequent course of development of the plant. The investigation 

 here reported is a study of the effects of high and low temperatures 

 and concomitant variations in the supply of nitrogen, phosphorus, 

 and potassium respectively upon the course of development of the 

 barley plant. A chemical correlation has been established between 

 temperature and nutrition effects. 



Literature 



Aderhold (i), working with young kohlrabi plants, noted that 

 r- exposures of the young plants to temperatures of —2° C. to —8° C. 

 J* for 8-i o hours tended to cause the plant to shoot into flowering 

 vVJ instead of forming the desired "ball." 



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