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The northeast corner of the county is intensive irrigated agriculture where onions, potatoes, small grains, alfalfa, corn and numerous other crops are grown. This area is known as the Treasure Valley and covers part of Malheur County and extends into Idaho. Onions are the major crop in this valley, which produces about 25% of the onions consumed in this country. Of course, potatoes are grown here, and except for a small amount of sugar beets grown in Union County, all of the sugar beets grown in Oregon comes from Malheur County. Almost all of the sweet corn seed for the United States is grown in the Treasure Valley area as well.
- Irrigated Winter Barley, Southern Idaho Fertilizer Guide, CIS 1082
- Acidifying Soil for Crop, EM 8857-E