12 The Bulletin. 



expressed in terms of acid phosphate containing 14 per cent avail- 

 able 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 fertilizer applications in the 

 fertilizer experiments are on basis of 400 pounds per acre for the 

 normal plat (N P K) of a mixture containing 7 per cent available 

 phosphoric acid and 2 per cent each of nitrogen and 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, ]^ P K and L, which have the following significance : 



N equals nitrogen at the rate of 10 pounds per acre, or 77 



pounds of 13 per cent dried blood ; 

 P equals phosphoric acid at the rate of 28 pounds per acre, 



or 200 pounds of 14 per cent acid phosphate ; 

 K equals potash at the rate of 10 pounds per acre, or 50 



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 weights 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 20.00 per ton. 



Rock Lime 10.00 per ton. 



The arrangements of the plats and the scheme of fertili::er appli- 

 cation is shown by the following: 



Normal fertilizer application, 400 pounds per acre of mixture con- 

 taining — 



Phosphoric Acid 7 per cent. 



Nitrogen 21/2 per cent. 



Potash 21/2 per cent. 



In this normal application — 



N equals 10 pounds nitrogen, equals 77 pounds 13 per cent 

 dried blood; 



