Agricultural Investment to Promote Improved Capture and Use of Rainfall and Dryland Farming
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The success of dryland agriculture depends on there being an adequate supply of water in the rooting zone of the soil, freely available to crop plants. Designers of investment projects to support dryland agriculture often analyse rainfall statistics in some detail. However they have tended to give less attention in project designs to measures which will promote more efficient capture and use of rainfall. This document reviews available technologies to improve in situ capture of rainfall and its more efficient use by crop plants. It concerns areas with restricted, irregular or markedly seasonal rainfall, mostly where the annual average is from 400 to 1,000 mm, but also where seasonal shortages of rainfall can limit crop productivity. It is directed to staff of the FAO Investment Centre and their counterparts in government teams responsible for project design.