1920] 



WALSTER— BARLEY 



101 



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. 



Total sugar 



Germination tempera- 

 ture 5-6 C 



Reducing 

 sugar 



Non-reducing 

 sugar 



Germination temperature 28 C 



Total sugar 



. 



Reducing 



sugar 



Xon-reducing 

 sugar 



I.. 

 II. 

 Ill 



IV 



V. 



I. 



II. 

 Ill 



IV 

 V. 



Petkuser winter rye 



42 



43 

 41 

 42 



40 



19 



34-93 



7.26 



40.92 j 



32S6 



14 



35-86 



7.28 



39-79 



. 3i 14 



.92 



34 -84 



7.08 



39 13 



31 08 



•31 



35-85 



6.46 



40.73 



33-94 



•97 



3 2 3i 



8.66 



39 52 



34 11 



8.36 

 8.65 



8.05 

 6.79 



5-41 



Petkuser spring rye 



36.58 



29.41 



7-17 



31-57 



2713 



4- 



3708 



3° -57 



6.51 



33 26 



26.58 



4 



35-39 



3°-4i 



498 



32 59 



26.81 



5- 



37-65 ] 



31.02 



6.63 



34 56 



3° 38 



4- 



3585 



30.21 



5-64 



3294 



28.16 



4 



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. 



