LIME AND OTHER SOIL AMENDMENTS 117 



the more general farm crops. Notice the large amounts in clover and 

 alfalfa. Common red clover contains more than alsike clover. It is less 

 tolerant of soil acidity than the latter. 



Average Lime and Magnesia (Equivalent to CaC0 3 and MgC0 3 ) in 2000 lbs. 



of the Following Crops. 

 (Calculated from von Wolff's Tables on the Basis of 15 per cent Moisture.) 



Produce. 



Timothy hay 



Wheat (grain and straw) 



Corn (grain, cobs and stover) 



Oats (grain and straw) 



Clover hay (alsike) 



Clover hay (red) 



Alfalfa hay 



Pounds of Carbonates as 



Tolerance to Acidity.- — Numerous tests at the Pennsylvania Experi- 

 ment Station show that when the lime requirement of the soil is 1500 to 

 1700 pounds of burnt or caustic lime per acre seven inches of soil, red 



NoL.r 



The Growth of Red Clover on an Acid Soil as Affected by Lime. 1 

 A sour soil is unfriendly to clover. Lime will overcome the difficulty. 



clover fails. This is equivalent to from 2700 to 3000 pounds of carbonate 

 of lime or crushed limestone. A lime requirement of 500 to 1000 pounds 

 per acre does not seriously interfere with the growth of red clover. In 

 ordinary farm practice the acidity seldom becomes sufficiently marked to 

 affect noticeably the cereals and grasses, although these may be indirectly 



Courtesy of The Pennsylvania Agricultural Experiment Station. 



