396 



Effect of Salicylic Aldehyde on Plauts [April-July 



When the plants had grown for several days it was noticeable 

 that the salicylic aldehyde cultures were developing slower. Each 

 of the cultures seemed affected regardless of the composition or the 

 Proportion of the nutrient salts. When the plants had grown for 

 12 days with four changes of the Solutions, the green weights were 

 taken. The results obtained with the Solution of different fertilizer 

 ingredients are grouped in the tables to follow, so as to bring to- 

 gether those cultures which were composed principally of phosphate, 

 those which were composed principally of nitrate, and those which 

 were composed principally of potassium salts. In each group there 

 were 21 cultures. A fourth group composed of six cultures is also 

 given, which comprises the cultures with nearly equal proportions 

 of the three salts. 



Table 4 gives the growth in cultures composed principally of 

 phosphate, without and with 10 p.p.m. of salicylic aldehyde. The 

 composition of the culture Solution is given in the first three columns. 

 As will be seen, the Solutions contain principally phosphate, but 



TABLE 4 



Effect of saUcylic aldehyde on wheat in nutrient culture Solutions, composed- 



principally of phosphate 



