40 Nebraska Agricultural Exp. Station, Research Bui. 6. 
Fig. 1. — A typical hill of corn adapted to eastern Nebraska. A hill with 
three such plants has approximately 3,600 square inches of leaf-area 
(counting only one side of the leaf, or 7,200 square inches including both 
sides), from which water evaporates. An acre contains 3,556 hills planted 
3 feet 6 inches apart. Such an acre has 4 acres of leaf-surface. 
