4 N. H. AGR. EXPERIMENT STATION [Bulletin 278 



A detailed suminary of the deficiencies follows : 



Nitrogen and available phosphoric acid 



Nitrogen and potash 



Nitrogen 



Potash 



Total phosphoric acid 



Available phosphoric acid 



29 34 



The total per cent of plant food nutrients guaranteed 

 was less than the total per cent found in only five brands. 

 Ten samples were deficient in nitrogen. Five of these 

 brands yvere deficient less than 3 pounds of nitrogen per 

 ton. One was deficient 8 pounds per ton and one was 

 deficient 12.8 pounds per ton. The greatest deficiency is 

 equivalent to about $1.50 per ton, assuming the nitrogen 

 present in the inorganic form and making no allowance 

 for overrun in the other constituents which in this brand 

 amounts to about $1.00 per ton. 



Only four samples Avere deficient in available phos- 

 phoric acid. Three of these deficiencies amount to less 

 than fifty cents per ton and the maximum deficiency less 

 than $1.00 per ton. 



There were eighteen samples deficient in potash. Six- 

 teen of these deficiencies amount to less than fifty cents per 

 ton. One was less than $1.00 per ton. One deficiency Avas 

 nearly $2.00 per ton although overages in nitrogen and 

 available phosphoric acid make up one-half the deficiency. 



Ill tlie tabulation of the analyses in the following pages 

 deficiencies of one-fourth of one per cent or more of 

 nitrogen and one-half of one per cent or more of available 

 phosphoric acid and water soluble potash are shown in 



