PLATE 17 
Cora plants showing effect of presence or absence of available iron and aluminum 
and value of lime as a corrective. 
A. —Two plants of Reid Yellow Dent grown from kernels from the same ear. All 
the plants at one end of the row were stunted. Here the soil gave a test for available 
iron and aluminum and indicated a lime requirement of i, 100 pounds. The soil at the 
other end of the ear row gave no test for available aluminum and had an excess lime 
content of 200 pounds per acre. 
B. —Two plants from a row of Country Gentleman Sweetcom grown close to the row 
of Reid Yellow Dent shown in A. Note the greater effect of the available aluminum 
and iron salts upon the sweetcom plant than upon the dent plant. 
