Table III. Gypsum or Land Plaster. 



Tonnage of Lime Products Sold as Soil Amendments in Massachusetts 

 during 1934 



Tons 

 19,582 

 6,319 



Ground limestone and shell lime .... 

 Other forms (largely hydrated and air slaked) 



Total 



25,901 



In securing the above statistics three producers failed to furnish us tonnage 

 data; and a conservative estimate was made in these cases. The above figures 

 seem low, for in 1930, 56,336 tons was sold. 



Lime Definitions 



The following definitions of lime products used in agriculture were made 

 official by vote of the Association of Official Agricultural Chemists at their 

 annual meeting in November 1935. The definitions for quick lime and hy- 

 drated lime, previously published in our lime bulletin No. 61, December 1931, 

 were revised by vote of the Association upon recommendation of the Committee 

 on Definition of Terms and Interpretation of Results on Fertilizers and Liming 

 Materials. 



1. The word lime when applied to liming materials means either calcium 

 oxide or calcium and magnesium oxides. 



2. High-calcium products are materials in which 90 per cent or more of 

 the total calcium and magnesium oxide content consists of calcium oxide. 



3. High-magnesium products are materials in which more than 10 per 

 cent of the total calcium and magnesium oxide content consists of magnesium 

 oxide. 



4. The designations quick lime, burned lime, caustic lime, lump 

 lime, unslaked lime, shall apply to calcined materials, the major part of 

 which is calcium oxide, in natural association with a lesser amount of mag- 

 nesium oxide, and which is capable of slaking with water. 



5. Hydrated or slaked lime is a dry product consisting chiefly of hydroxide 

 of calcium and oxide-hydroxide of magnesium. 



6. Agricultural liming materials are those lime products whose calcium 

 and magnesium content is capable of neutralizing soil acidity. 



Publication of this Document Approved by the Commission of Administration and Finance 

 2,500 — 2-'36. No. 6935. 



