Where Does 110 Billion Pounds of Manure Go?

Iowa raises about 23 million hogs each year. That many animals produce a lot of manure—some 110 billion pounds of it—but no one keeps track of where it goes. That’s a problem. Most manure from Iowa’s concentrated animal feeding operations (CAFOs) gets spread as fertilizer across the state’s cropland, but if it isn’t handled well, […]