AGRICULTURAL LIME 



79 



Fineness of division of lime (Fippin). 



The finer the lime (the smaller the particles) the greater its availa- 

 bility. Considering the calcium content, first cost, freight, and fineness, 

 it is often better to use the lump or hydrated or ground lime than the 

 ground limestone or marl; the lump quicklime slakes into very fine 

 particles when applied to the soil. It is impossible to attain the same 

 degree of fineness by grinding that is attained by burning and slaking. 

 Seventy-five per cent, at least, of the ground material should pass a 

 100-mesh screen. The larger the percentage of coarse material, the 

 larger the amount necessary to get the same net effect. Considering 

 composition and fineness as commonly found on the market, 50 Ib. of 

 lump lime is equivalent approximately to 



60 Ib. hydrated lime. 

 100 Ib. air-slaked lime. 

 250 Ib. ground limestone or marl. 



Classification of lime for agricultural purposes. 



Agreement between the Directors of the New England and New Jersey Ex- 

 periment Stations and the Special Committee of the National Lime Manufac- 

 turers' Association of Boston, March 3, 1909. 



Must contain 93% 

 combined oxides 



(1) Spraying I and hydrates and 



all pass a standard 

 . 100-mesh sieve. 



(1) Hydrate \ (Must contain not 



less than 90% 

 combined oxides, 



(2) Land \ hydrates, and car- 



bonates, of which 

 not over 25% shall 

 be carbonates. 

 Must contain 90% 

 combined oxides 

 and carbonates, of 



!(1) Lump which not more 



(2) Fines \ than 10% shall be 

 (3) Ground carbonates, except 



LIME \ ing Ground, which 



may contain 20% 

 I carbonates. 

 C Must contain 90% 

 1 combined carbon- 

 j ates and pass 50- 

 ( mesh sieve. 

 ( Not guaranteed, 

 | contains core, 

 { ashes, and refuse. 



(1) High Calcium { 



(2) Dolomitic 



or 

 [ High Magnesium 



(3) Ground Limestone 



[ (4) Kiln Slaked 



