Konu: Dry Farming - Author: John A. Widtsoe - January, 2004

http://www.4shared.com/file/96512645...ryFarming.html

PREFACE

Nearly six tenths of the earth’s land surface receive an annual rainfall of less than twenty inches, and can be reclaimed for agricultural purposes only by irrigation and dry-farming. A perfected world-system of irrigation will convert about one tenth of this vast area into an incomparably fruitful garden, leaving about one half of the earth’s land surface to be reclaimed, if

at all, by the methods of dry-farming...