Olive-oil production is predicted to slump to 673,700 metric tons from 1.6 million tons last year, the ministry wrote in a report on its website.
Spain is the biggest exporter of olive oil, used in cooking and salad dressings. The country had its second-driest summer in 60 years, with the June-through-to-August period the fourth- warmest since 1961, the ministry said in September.
Wine production in Spain, the third-largest producer behind France and Italy, is estimated at 33.5 million hectoliters (885 million gallons), dropping 13 percent from 38.6 million hectoliters in 2011, according to the report.
The corn harvest may fall 0.5 percent to 4.13 million tons from 4.15 million tons in 2011, based on the situation at the end of September, the ministry said, reversing an outlook for the crop to rise 2.3 percent.
Wheat production fell 26 percent to an estimated 5.09 million tons, similar to the outlook a month earlier. Spanish farmers harvested 5.98 million tons of barley, 28 percent less than last year and 70,200 tons less than previously estimated, the report showed.
Spain was the European Union’s second-biggest wheat importer in the 2011-12 season, behind Italy, EU data show.
To contact the reporter on this story: Rudy Ruitenberg in Paris at email@example.com