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The growing season in Sweden ranges from about 240 days in the south to 120 days in the north. Less than one-tenth of Sweden’s land area is under cultivation. Most arable land is found in southern Sweden, but there are arable parcels up to the Arctic Circle. Wheat, barley, sugar beets, oilseeds, potatoes, and staple vegetables dominate in the south, while in the north hay and potatoes are the main crops. In Sweden as a whole, animal agriculture is more significant than cereal farming. Dairy cows are important in all parts of the country, while pig and poultry raising are concentrated in the extreme south. The yields of Swedish farms are among the highest in the world. Environmental problems, however, have made it necessary to reduce the use of fertilizers. About half of Swedish forestland is privately owned, about one-fourth company-owned, and about one-fourth publicly owned. Forest work used to be complementary winter employment for small farmers using their horses; today forestry is carried on year-round by a small workforce and large, modern machinery. Nearly three-fourths of all Swedish farms have timberland. The average regrowth and harvest time for spruce and pine is about 50 years in the south and roughly 140 years in the north. Since the late 19th century, forestry in Sweden has been conducted on a sustained-yield basis, which establishes a ratio between cutting and new growth that is strictly enforced. Modern large-scale forestry methods have been subject to severe criticism, and major reforms were implemented in the 1990s. A thorough mapping and inventory of key woodland habitats was undertaken in the mid-1990s to identify areas with high biodiversity values.