Animal Manure Management

Alexis Samson, a sophomore agricultural engineering student, attended the Waste to Worth Conference where she expanded her knowledge of manure management, especially in the area of anaerobic digestion (AD). She learned that while AD systems can turn waste into biogas and fertilizer, their cost-effectiveness—especially for small farms—can be improved by incorporating food waste from local sources. Presentations at the conference also highlighted advancements in converting biogas to renewable natural gas (RNG), which offers both environmental and financial benefits for producers.

Manure spreaders are essential tools for distributing nutrients to crops to improve fertility and improve soil health. Therefore, achieving an even application of manure is just as important as with commercial fertilizers. Proper placement ensures that every part of a field receives the nutrients needed, leading to healthier crops and soil biology. This guide explains how to use manure spreaders effectively.

Applying manure to fields provides a natural and sustainable way to fertilize crops, reducing the need for synthetic fertilizers. It adds essential nutrients like nitrogen, phosphorus, and potassium, improving soil health and promoting plant growth. Additionally, manure enriches the soil with organic matter, enhancing its structure and water-holding capacity. However, there’s a side to manure that many don’t often think about, that is ammonia deposition. Ammonia deposition is the process by which ammonia is returned to the Earth’s surface after being released into the atmosphere.

Manure is often an under-valued resource. When well-managed and properly applied, it reaps many benefits. The benefits can be seen in the photo to the left, but are not captured in much of the field because of errors in application.

Odor emission is of great concern to the general public. An odor management plan is required in the permit application for livestock operations with more than 1,000 animal units. Producers need to understand odor emission from animal housing, manure storage and handling, and land application and available management options.

Excess nutrients in livestock feed all end up in manure because animals cannot utilize them. What you feed your livestock makes a big difference in the composition of the manure output. Feed management practices that not only meet animal requirements but minimize the amount of excess nutrients in manure help reduce risk of water contamination problems. Knowing the requirements of the animal you are feeding can improve your ability to feed the animal the correct amount of nutrients.

Watch this series of six videos for information on planning a Vegetative Treatment System on a small AFO.

Videos and resources on vegetative treatment areas, wetlands, low water stream crossings, and water quality projects.