FERTILIZERS AND AGRICULTURAL LIME 49 



Connecticut Adamant Plaster Co., 10 River Street, New Haven, Conn. 

 Nova Scotia Brand Land Plaster 



Eastern States Farmers' Exchange, Springfield, Mass. 

 Eastern States Land Lime 



L. A. Howard Talc Co., Proctorsville, Vt. 

 Howard's Agricultural Talc 



Limestone Products, Corporation of North America, Newton, N. J. 

 "Lime Crest" Brand Calcite Hydrated Lime for Agricultural Use 



New England Lime Co., Adams, Mass. 

 Nelco Agricultural Hydrated Lime (Adams) 



Solvay Process Co., Syracuse, N. Y. 

 Solvay Pulverized Limestone 



United States Gypsum Co., 300 West Adams Street, Chicago, 111. 

 USG Agricultural Hydrated Lime 



Variations and Deficiencies Found in the Composition 

 of Lime Products 



Of the lime products effective in neutralizing soil acidity, about 84 per cent of 

 those analyzed fully met the minimum guarantee; of the 22 ground limestone 

 products, 8 showed deficiencies. Most of the deficiencies were not of a serious 

 nature as the companion ingredient was present in sufficient excess to more than 

 make up the full neutralizing value of the product as based on the stated guarantee. 

 The same may be said of the hydrated lime products where only 2 out of 22 

 samples, about 9 per cent, showed deficiencies. The tables of analyses show the 

 extent of variations from the guaranteed composition. 



Explanation of Tables of Analyses 



Tables I, II, III, "Neutralizing value expressed in terms of calcium oxide" 

 represents the acid neutralizing value of both the magnesium and the calcium. 

 The figures in the "per cent" column are obtained by a direct titration with 

 standard acid. The "pounds in one ton" are secured by multiplying the figures 

 in the "per cent" column by 20. 



"Insoluble matter" represents material which is insoluble in dilute hydro- 

 chloric acid to which a few drops of nitric acid have been added, and is mainly 

 sand. 



Tables II and III, "Carbonates of calcium and magnesium." The figures in 

 this column are exclusive of the small amounts of calcium and magnesium com- 

 bined as basic silicates; these are readily soluble in mineral acid solutions but 

 obviously should not be classed as carbonates. 



Under "Mechanical analysis" the figures represent in round numbers the per- 

 centage of product that would pass or be retained by the meshed sieves men- 

 tioned. 



The limestone products have been published in two groups or grades (see 

 tables II and III) according to fineness of grinding and to conform to definitions 

 voted by the Association of Official Agricultural Chemists at their 1936 meeting. 



