Food for ^^^ Yo convert ammonia into an equivalent amount of 



^" ^ Nitrogen, multiply the given amount of ammonia by .8235. 



^^2 (^c) To convert a guaranteed per cent, of Nitrate of Soda 



to an equivalent of Nitrogen multiply the per cent, of Nitrate 



of Soda by 16.47. 



(d) To convert a guaranteed per cent, of sulphate of 

 potash to an equivalent of actual potash multiply the per 

 cent, of sulphate by .54. 



(e) To convert muriate (chloride) of potash to an equiva- 

 lent amount of actual potash, multiply the per cent, of muri- 

 ate (chloride) by .63. 



(/) To convert actual potash to an equivalent per cent, 

 of sulphate of potash, multiply the per cent, of actual potash 

 by 1.85. 



(g) To convert potash to an equivalent per cent, of muri- 

 ate (chloride) of potash, multiply the per cent, of actual 

 potash by 1.585. 



We now have the data for estimating the commercial 

 values of fertilizers from the guarantee-analyses as usually 

 published by manufacturers. We may in a few moments 

 calculate the comparative commercial values of different 

 trade-brands, and be governed in buying by their actual 

 commercial values and by the requirements of our soil and 

 the crops to be grown. Or, if we have an eye to saving from 

 twenty to thirty per cent, by mixing our own fertilizers dur- 

 ing the idle winter months, when we can usually buy agri- 

 cultural chemicals cheaper than at any other season of the 

 year, we can now proceed intelligently and prepare chemical 

 manures containing just such percentages of Nitrogen, 

 phosphoric acid, and potash, as soil and crop requirements 

 demand. 



We ascertain the cheapest source of raw materials, esti- 

 mate our wants and buy for cash on guaranteed analyses. 

 Or, better still, by CQ-operating with several other farmers we 

 purchase, at wholesale, sufficient raw materials for our com- 

 bined use. With a few hoes and shovels, a good-sized ash 

 sieve, and an even barn floor we are ready for work. 



,-.. . T, We proceed to spread the weighed raw 



Mixing Raw • 1 • u • 1 1 l a 



■jyj , 7 . materials m thm layers on the barn Hoor, 



building them layer upon layer to a height 



convenient for easy manipulation; then intimately mix with 



hoes by working the piles over from the outward edge inward, 



