1 9 20] WALS TER—BA RLEY 1 2 s 



and a high nitrogen supply at an early stage in the development of 

 the barley plant so shifts the equilibrium toward excessive vege- 

 tation as to prevent the normal tendency toward reproduction. 

 Some other factor must be altered, therefore, as, for example, the 

 water supply, if such plants are to be thrown into reproduction. 



An investigation of the nitrogen-carbohydrate ratio at a differ- 

 ent stage in the development of seeds and seedlings furnished with 

 varying concentrations of nitrogenous compounds will probably 

 throw considerable light upon these questions. 



Conclusions 



1. The excessive leaf production in the high temperature barley 

 is caused by the high concentration of nitrates in the nutrient 

 supplied. 



2, Nitrate nitrogen in the nutrient begins to affect the subse- 

 quent course of development at high temperatures at the time of 

 germination, or at least at a very early stage in the development of 

 the plant. The tendency to excessive vegetation thus inaugurated 



the 



salts. 



3. The effect of the nutrient supply is reflected in the compo- 

 on of the active organ, the leaf. The following equations rep- 



main 



High 



high soluble nitrogen in leaf + low soluble carbohydrate = excessive 



5 



culm 



nitrogen 



+ 



normal 



culm 





The writer gratefully acknowledges his indebtedness to Professor 



William 



Koch 



to Professor 

 ties: and to 



rtment 



►rded in their greenhouses 



Agricultural College 



N.D. 



