28 



Special Study of the Availability of Organic Nitrogen. A further 

 study was made of the availability of the organic nitrogen, by sep- 

 arating the organic from the inorganic portion of the several samples, 

 by means of carbon tetrachloride, and testing the former by the 

 alkaline permanganate method. (Se-j Jour, of Ind. and Eng. Chem., 

 Vol. 6, No. 7, page SO^f) The results are given in the following ta- 

 ble, and furnish additional proof of the low availability of the organic 

 nitrogen. j ^.^ 



NAME OF BRAND 



Percentage of 

 Total Nitrogen 

 in the Organic 

 Portion 



Percentage 

 of Water 

 Insoluble Ni- 

 trogen in the 

 Organic 

 Portion. 



Percentage 

 Activity ot 

 Insoluble 

 Nitrogen by 

 the Alkaline 

 Permanganate 

 Method. 



Complete Fertilizers. 



Prepared Alphano Humus 



Armour's Grain Grower 



Armour's Wheat, Corn & Oats Special 

 Baugh's Complete Animal Base Pert.. 

 Baugh's Grand Rapid High Grade 



Guano 



Baugh's H. G. Potato Grower 



Beach's Lawn Dressing 



Breck's Pulverized Sheep Manure. . . . 

 Carter's Worm Eradicating Fertilizer. 



Farquhar's Pulv. Sheep Manure 



Mapes' Corn Manure 



Natural Guano Co's Pulv. Sheep 



Manure 



Natural Guano Co.s' Pulv. Sheep 



Manure 



Wizard Brand Pulv. Cattle Manure.. . 

 Wizard Brand Pulv. Sheep Manure. . . 



Wizard Brand Pulv. Manure 



Royster's Logical Compound 



Ammoniated Superphosphates, 

 Berkshire Economical Grass Pert.. . . 



Lowell Sterling Phosphate 



Tavender's Am-Pho-Nite 



Blood's Electric Cut Worm Exterm. . 

 Alphano Humus "Raw" Sun-Cured.. 

 Boston Humus Co.'s Natural Humus 



3.06 

 4.44 

 6.78 

 8.74 



3.58 

 6.08 

 4.65 

 2.54 

 2.68 

 2.13 

 4.92 



2.41 



2.40 

 1.99 

 1.99 

 2.20 

 6.29 

 Sewerage and 

 12.31 

 2.88 

 3.42 

 1.45 

 2.78 

 2.63 



2.82 

 2.99 

 5.48 

 7.02 



2.36 

 2.77 

 1,98 

 2.11 

 2.36 

 2.02 

 3.88 



1.91 

 1.81 

 1.87 

 1.91 

 3.38 



Nitrogen Products 

 5.27 

 1.82 

 3.04 

 1.28 

 2.53 

 2.47 



34. 

 33. 

 49. 

 52. 



31. 

 32. 



52. 

 23. 

 27. 

 25. 

 41. 



26 



30. 

 22. 

 24. 

 25. 

 39. 



30. 

 45. 

 48. 

 13. 

 33. 

 29. 



In addition to the brands listed in the above table, a number 

 of others were found to contain inferior forms of insoluble nitrogen. 

 The brands were not condemned, however, as the amount of active 

 or available nitrogen present exceeded the minimum amount guaran- 

 teed. 



