PLATE 19 
Different parte of a field showing effect of iron and aluminum on corn plants 
in soil deficient in lime. 
A. —Field 6 miles north of La Fayette, Ind. Note the wide range of difference in the 
growth of the plants in the foreground compared with those beyond. The soil in the 
foreground gave no reaction for available aluminum and iron salts. The soil in the 
poorer parts of the field showed available aluminum salts and a lime requirement of 
900 pounds per acre. 
B. —Part of the field in A where abundant blighting of the plants occurred. Note 
the markedly reduced stand and weak plants. Seedling-blight is very prevalent under 
such soil conditions. 
