Why can combining crops and livestock reduce waste on smaller farms?

On smaller farms, combining crops and livestock creates interconnected systems that effectively reduce waste by cycling resources between the two components.1

A primary mechanism for this integration is the use of livestock manure as a source of organic matter and plant nutrients. By incorporating manure—which consists of animal excreta and bedding materials like straw—into the soil, farmers can improve the soil's physical character, enhance its water-holding capacity, and provide essential nutrients for crop growth. This practice is particularly vital for organic farms, where synthetic fertilizers are restricted.2

Beyond fertilization, these integrated systems allow for the recycling of agricultural byproducts. For instance, crop residues can be composted or used as feed, while livestock contribute to the farm's nutrient cycle through their waste. By managing these materials carefully, smaller farms can minimize the need for external inputs, improve soil productivity, and prevent the environmental issues associated with large-scale waste accumulation, such as water contamination from runoff.12