23 



the minimum guarantee in one or more elements. Thirty-three 

 brands were found deficient in one element, and 2 in both elements 

 of plant food. Eleven brands were found deficient in nitrogen, 

 and 20 in phosphoric acid. Four brands showed a commercial short- 

 age, two falling between $1.00 and $2.00 per tonand twounder$1.00, 

 but not less than 50 cents. 



Following are the brands which have shown the commercial 

 shortages: 



Internalional JgricvHural Corporation, Buffalo Top Dresser, 

 Nos. 396-707-783-978. Nitrogen found 5.28%, guaranteed 5.80%; 

 available phosphoric acid found 6.97%, guaranteed 6.00%. 



Another analysis of this brand, No. 1117, showed both elements 

 well above the guarantee. 



National Fertilizer Co., Nitrogen Phosphate Mixture No. 3, 

 No. 909. Nitrogen found 2.20%, guaranteed 2A7%; available 

 phosphoric acid found 9.48%, guaranteed 10.00%. 



New England Fertilizer Co., New England High Grade Potato 

 Fertilizer 4-10, Nos. 481-609. Nitrogen found 3.07%, guaranteed 

 3.28%; available phosphoric acid found 10.07%, guaranteed 10.00%. 



Parmenier & Polsey Fertilizer Co., P. &. P. Plymouth Rock 3^- 

 10, Nos. 899-1219. Nitrogen found 2.80%, guaranteed 2.88%; 

 available phosphoric acid found 9.26%, guaranteed 10.00%. 



A study of the quality of nitrogen used in these 

 Quality of formulas for 1910, shows that the average total 



Plant Food nitrogen was 3.52%; nitrates and ammoniatcs 1.82%; 



in Complete organic nitrogen 1.70%. In other words, 51.7% of the 

 Fertilizers. total nitrogen was present in form of nitrates 



and ammoniates, and 48.3% as organic, showing the use of a 

 considerably higher proportion of mineral nitrogen than for 1915. 



The quality of the organic nitrogen used is indicated by the 

 following average: water soluble organic .40%; water insoluble 

 organic 1.24%, of which .67% was found active and .57% inactive 

 by laboratory methods. The percentage activity of the total nitro- 

 gen in the complete fertilizers was 83.80; of the total organic nitro- 

 gen 66.47, and of the water insoluble organic nitrogen 54.03. 



