Though only about 17% of Spain's cultivated land was irrigated, it was estimated to be the source of between 40 and 45% of the gross value of crop production and of 50% of the value of agricultural exports. More than half of the irrigated area was planted in corn, fruit trees, and vegetables. Other agricultural products that benefited from irrigation included grapes, cotton, sugar beets, potatoes, legumes, olive trees, mangos, strawberries, tomatoes, and fodder grasses. Depending on the nature of the crop, it was possible to harvest two successive crops in the same year on about 10% of the country's irrigated land.