STORING LIME IN THE SOIL 



plants within the state had increased from 

 one to 56, and more than a dozen outside 

 plants are shipping extensivelyinto the state. 

 The bulletin says: "Farmers who have had 

 experience with the use of ground limestone 

 are as a rule satisfied with only a reasonable 

 degree of fineness, and are able to judge the 

 material by inspection. When limestone is 

 ground so the entire product will pass a 10- 

 mesh (or 2 mm.) sieve, the greater part of 

 it will be finer than a 4O-mesh (or y 2 mm.) 

 sieve. . . . There are now in operation 

 in this State more than a dozen small port- 

 able community grinders; they are doing 

 much to help solve the ground limestone 

 problem and their use is rapidly increasing. 

 In the practical operation of these machines 

 they grind only to medium fineness (2 

 mm.) . To insist upon extreme fineness is to 

 discourage their use." 



This State experiment station is only one 

 of many scientific authorities approving the 

 use of limestone reduced only to such fine- 

 ness that it will pass through a lo-mesh 

 screen, the cost of the grinding being suffi- 

 ciently small to permit heavy applications. 



43 



