National Geographic : 1929 Jan
ARIZONA COMES OF AGE CITRUS CULTURE IS AN IMPORTANT FACTOR IN ARIZONA'S HORTICULTURAL GROWTH Small trees, too young to be left outdoors in winter, are taken up by a "balling machine," which holds a ball of earth about the roots, and temporarily planted under shelter. In spring they are set out again. "Balling" grapefruit and orange trees in a Salt River Valley grove near Phoenix. Photographs by Clifton Adams FROM THE DELTA OF THE NILE CAME ARIZONA'S LONG-STAPLE COTTON The staple of this Pima cotton averages Is/ inches and is much used in automobile tire manufacture. It was developed from Mit Afifi cotton, brought from Egypt by the U. S. Depart ment of Agriculture about 19oo. Mexican pickers, near Litchfield Park, Arizona.