The Bulletin 11 



acid phosphate containing 14 per cent available phosphoric acid, dried 

 blood containing 13 per cent nitrogen, nitrate of soda containing 14.8 

 per cent nitrogen, and manure salt containing 20 per cent potash, which 

 figures represent the average composition of these materials. The ferti- 

 lizer applications in the fertilizer experiments are on the basis of 300 

 pounds per acre for the normal plat (N P K) of a mixture containing 

 7 per cent available phosphoric acid, 3 per cent nitrogen, and li/o per 

 cent of potash. Lime is applied at the rate of 500 pounds rock or 

 building lime, or 1,000 pounds slaked lime. The fertilizer applications 

 in the tables, in addition to being represented in terms of acid phosphate, 

 dried blood, nitrate of soda and manure salt, are also expressed in terms 

 of the symbols, N, P, K, and L, which have the following significance : 



% 



N" equals nitrogen at the rate of 9 pounds per acre or 69.2 pounds 

 of 13 per cent dried blood; 



P equals phosphoric acid at the rate of 21 pounds per acre, or 150 

 pounds of 14 per cent acid phosphate; 



K equals potash at the rate of 4.5 pounds per acre, or 22.5 pounds 

 20 per cent manure salt ; 



L equals lime at the rate of 500 pounds rock, or 1,000 pounds slaked 

 lime per acre. 



There are columns in the tables showing the exact weight in pounds 

 of phosphoric acid, nitrogen and potash applied to each plat (expressed 

 on acre basis) which will enable any one to use these same amounts of 

 fertilizer constituents in other materials if desired. 



The following average prices which fairly represent the cost of the 

 several materials to the farmer for the period under experimentation 

 have been assumed for the materials used : 



14 per cent Acid Phosphate $14.00 per ton 



13 per cent Dried Blood 60.00 per ton 



14.8 per cent Nitrate of Soda (18 per cent 



ammonia) 50.00 per ton 



20 per cent Manure Salt 10.00 per ton 



Rock Lime 10.00 per ton 



The arrangement of the plats and the scheme of fertilizer application 

 is shown by the following : 



Normal fertilizer application, 300 pounds per acre of a mixture 

 containing : 



Phosphoric Acid 7 per cent 



Nitrogen 3 per cent 



Potash 11/2 per cent 



