The Bulletin. 13 



of a iiiiTnbcr of years' experiments, the fertilizer applications are ex- 

 ])ressod in terms of acid plios))hate containing 14 per cent available 

 ]i!iO!^j)lioi'ic acid, dried blood containing 13 per cent nitrogen, nitrate 

 of soda containing 14.8 per cent nitrogen, and manure salt contain- 

 ing 20 per cent potash, which figures represent the average composi- 

 tion of these materials. The fertilizer applications in the fertilizer 

 experiments ai-e on 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 of nitrogen, and 1| per cent of potash. Lime is 

 ajiplicd at tlie rate of ;'")00 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 mannre salt, are also expressed in terms of the 

 symbols, JST, P, K, and L, which have the following signiticance : 



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 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 GO. 00 per ton 



14.8 per cent ]S^itrate 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 fertilizer applica- 

 tion is shown by the following: > 



Xormal fertilizer application, 300 pounds per acre of mixture 

 containing — 



Phosphoric Acid 7 per cent. 



Kitrogen 3 per cent. 



Potash 1^ per cent. 



