398 



Effect of Salicylic Aldehyde on Plauts [April-July 



weight of the 21 cultures in nutrient salts was 49.36 gm. and the 

 green weight of the 21 nutrient cultures containing 10 p.p.m, saHcy- 

 lic aldehyde was only 36. 1 1 gm. From these figures it is seen that 

 salicylic aldehyde in these nutrient Solutions (principally nitrog- 

 enous), as in the phosphate Solutions, is quite harmful to wheat 

 plants. 



Table 6 gives the effect of salicylic aldehyde in cultures that are 

 principally potassic, as does Table 4 for the phosphate cultures and 

 Table 5 for the nitrate cultures. 



TABLE 6 



Effect of salicylic aldehyde on wheat in nutrient culture Solutions, composed 



principally of potash 



From Table 6 it is seen that the aldehyde cultures are much 

 smaller than the normal cultures. The total green weight of the 

 21 normal cultures was 47.67 gm. against 33.74 gm. for the cultures 

 containing the salicylic aldehyde. 



The six cultures composed of approximately equal amounts of 

 P2O5, NH3, and K2O are given in Table 7. The total green weight 

 of the cultures in nutrient salts without salicylic aldehyde was 18.92 



