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 op 

 Phosphoric 

 Matkbials. Amount. Nitrogen. Acid. Potash. 



Nitrate of Soda 500 lbs. 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. ^^j^j Potash. 



Nitrate of Soda 150 lbs. 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% 



JSTo. 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. 



