230 SOILS 



The commercial sulphate of ammonia contains about 

 twenty per cent, of nitrogen, or four hundred pounds of 

 nitrogen to the ton. In this material the ammonia is held 

 and is prevented from escaping by the sulphuric acid. 

 Sulphate of ammonia is easily soluble in water, and dis- 

 tributes itself through the soil where plant roots can get 

 at it. It adds to the nitrogen stores where come plant 

 roots for the nitrogen necessary to their growth. 



On account of the ease with which water dissolves it, 

 sulphate of ammonia is one of our most valuable and 



NITROGEN 

 NITRATE of SODA. < 

 SULPHATEof AMMONIA 

 DRIED BLOOD 

 TANKAGE 

 FISH SCRAP 

 COTTON SEED MEAL 



PHOSPHOROUS 



ACID PHOSPHATE 

 GROUND BONE: 

 DISSOLVED BONE 

 POTASSIUM 



KAINIT 



MURIATE of POTASH 



SULPHATEof POTASH 



ASHES 



OUR COMMON FERTILIZING MATERIALS 



quickly acting sources of nitrogen for plants, but, at the 

 same time, it is one of the most costly sources. It is not 

 as readily washed out of soils as nitrate of soda. 



The chief source of supply is at the gas factory, where 

 it becomes a waste product in the manufacture of gas 

 from soft coal, and in the production of coke from coal. 



Nitrate of soda or chili saltpeter is a white solid ma- 

 terial that is mined in the rainless districts of South 

 America. As found there, it is mixed with other sub- 

 stances, but when purified, it is put on the market as 

 commercial nitrate of soda to be used as a chemical 



