6o 



FARM AND SCHOOL PROBLEMS. 



Peas. 



Per cent of Equa 



Each Pot Lime Appl 



was Applied of Ac, 



Numbered per pot Lime 



1 no lime no ton< 



2 5/100% y 2 ton 



3 1/10% 1 ton 



2/10% 2 tons 



5 3/10% 3 tons 



6 5/10% 5 tons 



Mark the difference in increase between Pot No. 4 and No. 5 

 with Alfalfa. There is a yield increase of 73% caused by the 

 application of i ton of lime per acre on top of the two tons 

 already in the soil and only a yield of 3% caused through the 

 application of 2 tons of lime per acre on top of the 3 tons of lime 

 already in the soil. 



By means of 

 the "Standard Soil 

 Tester" the amount 

 of acidity or lime 

 may be determined 

 in any soil. 



No a g r i c u 1- 

 tural laboratory is 

 complete without 

 it. It is even more 

 important to agri- 

 culture than the 

 Babcock test. 



It is a simple 

 experiment and 

 .will tell just how 

 much lime is in the 

 soil and where there 

 is need of lime and 



Courtesy Standard Soil Tester Co., Milwaukee, Wis. 1~1OW much. 



NOTE For directions for using the Standard Soil Tester write to 

 the above named Co', or to the author of this book. 



FIG. 4 



The Standard Soil 

 Tester. 



