12 The Bulletin. 



years' experiments, the fertilizer applications are expressed in terms of 

 acid phosphate, containing 14 per cent available phosphoric acid, 

 dried blood containing 13 per cent nitrogen, nitrate of soda con- 

 taining 14.8 per cent nitrogen, and manure salt containing 20 per cent 

 potash, which figures represent the average composition of these ma- 

 terials. The fertilizer applications in the fertilizer experiments are on 

 the basis of 400 pounds per acre for the normal plat (IST P K) of a 

 mixture containing 7 per cent available phosphoric acid and 2^2 per cent 

 each of nitrogen and of potash. Lime is applied at the rate pf 500 

 pounds of rock, builder's or burnt 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 : 



iSr 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 of 20 per cent manure salt; 

 L equals lime at the rate of 500 pounds rock or unslaked 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 the 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 Am- 

 monia) 50.00 per ton. 



20 per cent Manure Salt 20.00 per ton. 



Eock Lime 10.00 per ton. 



The arrangements of the plats and the scheme of fertilizer application 

 is shown by the following: 



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

 taining — 



Phosphoric Acid 7 per cent. 



Nitrogen 2 14 per cent. 



Potash 2^ per cent. 



In this normal application — 



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



dried blood; 

 P equals 28 pounds phosphoric acid, equals 200 pounds 14 



per cent acid phosphate; 

 K equals 10 pounds potash, equals 50 pounds 20 per cent 



manure salt. 



