By Scout Nelson
Researchers are conducting a large multistate study to better understand how swine manure affects soil health and crop production. The project is led by South Dakota State University and involves research teams from ten states across major pork-producing regions.
For generations, farmers have used animal manure as a natural fertilizer. Swine manure contains important nutrients such as nitrogen, phosphorus, and potassium, which help support plant growth. Many producers report improved crop performance when using manure, but large-scale scientific data comparing it with commercial fertilizers has been limited.
To address this knowledge gap, researchers launched a comprehensive study in 2022. The project examines how swine manure influences soil health, nutrient levels, and corn yields. Scientists are also comparing manure applications with traditional commercial fertilizer programs to determine long-term benefits.
The study brings together experts in animal science, agronomy, soil science, water resources, and agricultural engineering. Research locations are established in Illinois, Iowa, Michigan, Minnesota, Missouri, Nebraska, Ohio, Pennsylvania, South Dakota, and Wisconsin.
Funding for the project comes through a $3.5 million grant from the National Pork Board. The study uses consistent research methods across all locations to ensure reliable results. Each site includes plots treated with commercial fertilizer, swine manure, and swine manure combined with starter fertilizer.
Researchers collect soil samples before treatment and after harvest each year. The samples are analyzed for chemical, biological, and physical soil properties. Special attention is given to nutrient availability, soil quality, water movement, and crop performance.
The project will continue through 2029, allowing scientists to gather long-term data on how manure affects soil productivity over time. Early results have already generated hundreds of soil samples and have been shared through educational programs, presentations, and research discussions.
Researchers believe the findings will help farmers make informed decisions about fertilizer management while improving soil health and sustainability. The project also highlights the strong connection between livestock and crop production systems.
As the study moves forward, scientists hope the results will provide clear evidence about the value of swine manure and support practical recommendations for producers, researchers, and policymakers seeking effective and sustainable agricultural practices.
Photo Credit: gettyimages-magicxeo
Categories: South Dakota, Livestock, Hogs, Sustainable Agriculture