quality of soil, and "plowed in deeply at the edge of the ^^^^ ^^^ 

 branches, about the beginning of the growing season." ^ *^ 



Formula : Pounds. 



Bone tankage (lo per cent, ammonia) i,ooo 



Nitrate of Soda 140 



Sulphate of potash 60 



Dissolved bone (16 per cent, available phosphoric acid) 800 



2.000 



PURDUE UNIVERSITY, 

 INDIANA AGRICULTURAL EXPERIMENT 



STATION, 



LAFAYETTE, IND. 



C. S. PLUMB, Director. 



Bulletin No. 84. 

 Growing Lettuce With Chemical Fertilizers. 



BY PROF. WILLIAM STUART. 



The subject of lettuce culture with chemical fertilizers 

 was undertaken by the writer some years ago, and has been 

 continued. 



Page 134. 



It is safe to infer that for any quick 



I 7 * • r AvaiiaDiiity 01 



grozving crops, or where an application of ^. 



Nitrogen ts desirable in the maturing of a 



crop, the N itrate of Soda is preferable to dried blood. 



The results obtained from the several Conclusions 



experiments enumerated seem to invite the Pertaining to 



following conclusions: Nitrate of Soda. 



1. That in order to study the action of the three essen- 

 tial elements of plant food, Nitrogen, phosphorus and 

 potassium, a soil must be used that is fairly deficient in 

 plant food. 



2. That potash when used m any considerable amount, 

 either alone or in connection with Nitrate of Soda, pro- 

 duced conditions unsuitable to plant growth. 



3. When phosphoric acid was used alone or in con- 

 nection with Nitrate of Soda or muriate of potash, even in 



149 



