SOIL DEFICIENCIES 



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though the writer has been able to find little experimental evidence 

 that such is the case under actual field conditions. In the section 

 on absorption, evidence is given that in the laboratory, lime and 

 other salts replace absorbed potash. 



Experiments with Burned Lime or Ground Limestone. In 



experiments at the Pennsylvania and at the Maryland Experi- 

 ment Station, 1 ground limestone has given better results than 

 burned lime. At the Pennsylvania Station, lime was used in a 

 four year rotation of corn, oats, wheat, and hay, at the rate of two 

 tons per acre of burned lime every four years or two tons of 

 ground limestone per acre every two years. The average yield 

 for 20 years is as follows : 



The burned lime injured the corn, oats, and hay, while the 

 ground limestone was of benefit to the oats, wheat, and hay. 

 Analysis of the soil showed that the soil receiving burned lime 

 had lost more nitrogen than the other. 



At the Maryland Experiment Station, different kinds and 

 amounts of lime were applied to various plots at the beginning of 

 the experiment. The results of 11 years test with 1,400 pounds of 

 burnt lime, or an equivalent amount of carbonate of lime from 

 shell or marl, with the rotation of corn, wheat, and hay, are as 

 follows : 



1 Report for 1902. 



