8 N. H. AGR. EXPERIMENT STATION [Bulletin 214 



The per cent means the number of pounds in 100 

 pounds. Since there are twenty hundred pounds in a ton 

 we multiply the per cent by twenty to find the number of 

 pounds of each plant food. Then by knowing the value 

 of these per pound, we can figure the value of each plant 

 food per ton. 



BUY HIGH ANALSIS FERTILIZERS. 



It costs just as much to mix, bag and deliver a ton of 

 low analysis fertilizer as it does a ton of high analysis. For 

 this reason the cost of the plant food must be much higher 

 in the low analysis fertilizer. The average cost of a 1-8-2 

 fertilizer the past season was $41.00. The value of the S 

 units of phosphoric acid was 8 times $1.64 or $13.12. The 

 value of the two units of potash was 2 times $0.86 or $1.72. 

 The value of the available phosphoric acid and potash then 

 was $13.12 plus $1.72 or $14.84 and the nitrogen cost 

 $41.00 minus $14.84 or $26.16. The average content of 

 nitrogen was 0.89 per cent. One ton contained 0.89 times 

 2,000 or 17.8 pounds of nitrogen. The cost per pound of 

 nitrogen was $26.16 divided by 17.8 or 1.48. The cost per 

 unit was 20 times $1.48 or $29.60. On the same basis the 

 average cost per unit of nitrogen in a 4-8-4 fertilizer is 

 $10.00 or about one-third as much as in the 1-8-2 fertilizer. 



Table No. 1 gives the cost of nitrogen in the different 

 brands of complete fertilizer analyzed this past year. 



