1920] 



WALSTER -BARLEY 



IOT 



temperature barley plants showed an excessive development of 

 tillers and no indication of ever heading. Inspection of the figures 

 shows that the leaves of the high temperature plants were abnor- 

 mally long, and especially so in the case of the barley. The general 

 growth characters obtained by Hutcheson and Quantz were 

 obtained in the present investigation in the case of high tempera- 

 ture, high nitrogen series (fig. 13). These authors grew the grain 



TABLE I 



Sugar content of first leaves of rye* (percentage of dry weight) 



Series no. 



I.. 

 II. 

 III. 

 IV. 

 V. . 



I.. 

 II. 

 III. 



IV. 

 V. . 



Total sugar 



Germination tempera- 

 ture 5-6 C. 



Germination temperature 28 C 



Reducing Non-reducing Total 

 sugar sugar 6 



Reducing 

 sugar 



Non-reducing 

 sugar 



Petkuser winter rye 



8.36 

 8.65 

 8.0s 

 6.79 



5-4i 



Petkuser spring rye 



44 

 68 



78 

 18 



78 



* Similar results were obtained with barley. 



in 4-inch clay pots, two plants to the pot. No mention is made 

 concerning the substrate used in their experiments. 



This investigation of the influence of high and low temperatures 

 upon the growth of barley was planned to ascertain in particular 

 the influence of variations in the supply of nutrient salts with 

 concomitant variations in the temperature. The nutrients varied 

 were nitrogen, potassium, and phosphorus. Chemical analyses 

 were made in order to relate certain observed differences in growth 

 to possible differences in the chemical composition. 



