ARTIFICIAL MANURES OR FERTILIZERS. 109 



phosphoric acid, and ten per cent of actual potash, the 

 following materials would furnish it, assuming an aver- 

 age analysis for them : 



Formula No. 1. 



CONTAINING POUNDS OF 



Phosphoric 

 MATERIALS. AMOUNT. Nitrogen. Potash. 



Nitrate of Soda ..... 500 Ibs. 80 



Bone-black Superphosphate . 1,100 176 



Muriate of Potash .... 400 200 



Total ........ 2,000 80 176 200 



Guaranteed Analysis ........ 4% 8.8% 10% 



A mixture containing two and one-half per cent of 

 nitrogen, eight per cent of available phosphoric acid, and 

 two per cent of potash may be made from the following 



materials : 



Formula No. 2. 



CONTAINING POUNDS OF 



Phosphoric 

 MATERIALS. AMOUNT. Nitrogen. Potash. 



Nitrate of Soda ..... 150 Ibs. 24 



Dissolved Bone ...... 1,300 26 160 



Muriate of Potash .... 80 40 



Land Plaster ...... 470 



Total ........ 2,000 50 160 40 



Guaranteed Analysis ........ 2.5% 8% 2% 



No. 1 is a high-grade product, both in respect to 

 quality of plant-food and concentration; while No. 2 is 

 high-grade only in respect to quality. In order to get 

 the plant-food distributed throughout the ton, it is neces- 

 sary to add what is called a "make-weight" or diluent. 



High-grade mixtures cannot be made from low-grade 

 materials. Low-grade mixtures cannot be made from 

 high-grade materials without adding " make-weight." 

 The advantages of high-grade products are concentration 

 and high quality of plant-food. 



