Fertilizers 17 



HOW TO USE THE TABLE 



This table enables one to ascertain the amount of 

 different ingredients that may be used in compounding 

 any normal formula. To secure the amount of plant- 

 food contained in a formula giving 5 per cent ammonia, 

 6 per cent potash, and 6 per cent phosphoric acid, it will 

 require 550 pounds nitrate of soda, 252 pounds muriate 

 of potash, and 750 pounds 16 per cent acid phosphate. 

 To ascertain the amount of ammonia needed, read down 

 the first column to 5 (the per cent of ammonia the formula 

 calls for), then read across to the column under nitrate 

 of soda where we find 550 pounds as the required amount 

 of nitrate of soda. To get the amount of potash, read 

 down the first column until 6, the number representing 

 the percentage of potash, is reached, then read across the 

 column until muriate of potash is reached, where we find 

 the number 252. We find the number (6) representing 

 the percentage of phosphoric acid desired, in the same 

 way, and then again read across the columns until the 

 one representing 16 per cent acid phosphate is reached, 

 where we find the number 750. This combination gives 

 us 1552 pounds. If a ton of material is wanted, one 

 can supply the deficiency by adding soil or other inert 

 material. 



Very many combinations can be made. All the ma- 

 terials in this table may safely be mixed. Some combina- 

 tions may solidify after mixing, and would need to be 

 crushed. 



It is frequently advisable to use the ammonia from two 

 sources, for example, nitrate of soda and cottonseed meal. 



