1902. 



FORESTRY AND IRRIGATION. 



519 



tion respectively show a net annual re- 

 turn of $12 65 and $14.78 per acre from 

 the time of planting. The Yaggy 

 plantation shows a net return of $7.25 

 to $21.55 per acre, depending on the 

 fertility of the soil in various parts of 

 the plantation. 



From these figures it will be seen 

 that the growing of Catalpa brings 

 fully as great returns as are to be real- 

 ized from any agricultural crop in the 



Hardy Catalpa makes its best growth 

 on very rich, deep soil. In the Farling- 

 ton forest the returns on the best soil 

 are almost five times as great as on the 

 poorest. 



Grown in pure stand, the Catalpa 

 should be protected from the wind by 

 shelter belts of taller trees. A thin belt 

 of Cottonwood on the windward side of 

 a plantation will protect the edge trees 

 and allow them to make much taller 

 and straighter growth ; even an Osage 



A 20-YEAR-0I,D PlyANTATION OF HARDY CATA1,PA IN SOUTHERN IOWA. 



