3.25%x2000 lbs. = 65 Ibs. Nitrogen which at $0.173 per lb. = $11 25 Food for 



Plants 

 6.00%x2000 Ibs. = 120 Ibs. Phosphoric Acid 



which at 0.048perlb.= 5.76 243 



5.00%x2000 Ibs. = 100 Ibs. Potash which at . 052 per Ib. = 5 . 20 



$22.21 



Assuming that all the Nitrogen in the mixed fer- 

 tilizer was derived from Nitrate, the value per ton would 

 be $22.21, exclusive of the cost of mixing and bagging. 



Straight Fertilizer Formulas for 



Farm, Fruit, and Market 



Garden Crops. 



The primary object in the preparation of fertilizer 

 formulas is to show the kinds and amounts of materials 

 to use in order to provide in a mixture good forms and 

 proportions of the constituents, which shall be in good 

 mechanical condition. It is not believed that any one 

 formula is the best for all conditions, these vary as 

 widely as the soils and different methods of manage- 

 ment. 



Substitutions That May Be Made. 



It is not intended that the kinds of materials shall 

 be absolutely adhered to, for in many cases substitutions 

 of others may be made not only without materially 

 changing the composition of the resultant mixture, but 

 which may also reduce its actual cost. For example, 

 tankage or dried ground fish may be substituted for cot- 

 ton-seed meal in any mixture, and if the right grades are 

 obtained, will substitute the amount of nitrogen in it, 

 though it may be in a slightly less available form; 

 besides, the former contains considerably more phos- 

 phoric acid. In other instances, dried blood may be 

 substituted with advantage for the tankage or cotton- 



