CROPS AND SOIL IMPROVEMENT 



it is best to let cost of correction of soil acidity 

 determine the form of lime to be used. 



The material that will render the soil friendly to 

 clover for the least money is the right one to se- 

 lect. We need to be concerned only with the rela- 

 tive efficiencies of the various forms of lime, as 

 measured in terms of money. That which will 

 most cheaply restore heavy clover growths to the 

 land is the form of lime to be desired. The con- 

 tentions of salesmen may well be disregarded as 

 they produce confusion and delay a work that is 

 important to the farmer. 



Definitions. The use of the various forms of 

 lime will become general, and the terms employed 

 to designate them should be understood. They 

 vary in their content of acid-correcting material, and 

 their correct names should be used with accuracy. 



Stone-lime, often called lump-lime or unslaked 

 lime, or calcium oxide or CaO, is a form widely 

 known, and may be taken as a standard. It is 

 the ordinary lime of commerce, and is obtained by 

 the burning of limestone. One hundred pounds 

 of pure limestone will produce 56 pounds of stone- 

 lime (CaO). 



Pulverized lime, often called ground lime, is 

 stone-lime after being pulverized to permit even 



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