237 



SHOWING THE RESULTS OBTAINED FOR POTASH 

 (K 2 O) IN THE CULTURES CONTAINING 



DIFFERENT AMOUNTS (Page 91): 

 Potash content Green weight 



K 2 O of plant 



parts per million grams 



80 1 . 106 



72 1.922 



64 2.661 



56 2.890 



48 3.222 



40 3.600 



32 3.929 



24 3.877 



16 3.538 



8. 3.172 



The table shows a decided falling off in the 

 productiveness of this solution when a concen- 

 tration of 56 parts is reached, and in the cul- 

 ture containing 80 parts the plant produced 

 less than one-third the green weight it was 

 able to produce with from 24 to 48 parts. 



The table giving the results of phosphoric 

 acid experiments is equally instructive. Thus : 



SHOWING THE RESULTS OBTAINED FOR PHOSPHORIC 

 ACID (P 2 O 5 ) IN THE SOLUTIONS CONTAINING 



DIFFERENT AMOUNTS (Page 87): 

 Phosphorus Green weight 



as P 2 O 5 of plant 



parts per million grams 



80 0.648 



72 1 . 226 



64 1 . 983 



56 2.580 



48 3.045 



40 3.340 



32 3.295 



24 3.308 



16 3.558 



8.. ..3.640 



