Organic farms support substantially more birds, wild plants, and other wildlife than chemical-dependent farms, according to Britain’s Soil Association, which surveyed biodiversity studies conducted in Britain and Denmark over the last 13 years. The findings will likely prompt calls for wider use of organic farming methods to help reverse the decline of once-common British farmland birds like the skylark and lapwing. Only about 3 percent of British farmland is now organic, but the market for organic food in the nation is growing.