Page:Tree Crops; A Permanent Agriculture (1929).pdf/359

 of almond, olive, apricot, oak, mesquite, honey locust, walnut, or other fruiting trees which could be planted out in the arroyos of the arid Southwest so that the sheep ranches of our own country might be dotted with productive trees in a manner identical to that of the Berbers who have dotted their sheep and goat ranches with olive trees and date palms. Enough of this has been done in Kansas to merit much more attention than it has received.

Examination of the map will show (Fig. 136) that every continent has large areas of grass land or scrub land on which this is about the only possible form of agriculture.

The world needs immediately eighteen or more experiment stations whose staffs are experts in the breeding of desert trees. Each of these stations would have on the average a million square miles of land to serve. Each station would possibly increase the productivity of at least fifty thousand square miles or thirty-two million acres. Suppose five dollars per