This project will evaluate several types of liquid manure injectors to identify the most efficient and environmentally responsible options for Wisconsin dairy farms. Manure injectors place liquid manure below the soil surface, where nutrients are less likely to be lost to the air or washed away by runoff. Researchers will compare commonly used injector designs to determine how they affect fuel use, soil disturbance, nutrient retention, and overall operating costs. The study will combine computer modeling, laboratory testing, and on-farm field trials to identify equipment that delivers manure effectively while minimizing energy use and impacts on soil health.

For dairy farmers, the research could lead to practical recommendations that reduce manure application costs while improving nutrient use efficiency. By identifying injector designs that require less fuel and cause less soil disturbance, farmers may be able to lower operating expenses, preserve soil structure, and make better use of the nutrients already available in manure. Improved nutrient retention can help support crop growth, reduce dependence on purchased fertilizers, and assist farms in meeting environmental stewardship goals. Ultimately, the project aims to help Wisconsin dairy producers make informed equipment decisions that strengthen both profitability and long-term sustainability.