Sprinkler irrigation on an experimental field of asparagus. - - Technical Assistance S-o Francisco irrigation Project: FAO/UTF/BRA/026/BRA. The Sà??rancisco Valley is located in the north-east part of Brazil and occupies an area of 64 million ha. Its agricultural potential has been estimated at 3 million ha. of irrigable land and 27.3 million ha. for dryland crops. The region has potential e