Page:Tree Crops; A Permanent Agriculture (1929).pdf/275

 . 92. Top. A forest of oak (ilex) on a mountain in Majorca. One product is charcoal made by the continuous thinning and trimming necessary to keep it open as it now is for large acorn production—an acorn orchard.—. 93. Center. A harmless-looking wash in a cotton field in the red clay hills of Georgia. Note that no cotton grows in or near it. All the top soil is gone—in a few years.—. 94. Bottom. Close view of contour drainage ditches much used in south to stop field wash. The corn rows curve with the terraces which might with ease be lined with trees. (Photos J. Russell Smith.)