Researchers Explore Manure’s Role in Soil Health and Emission Reduction

A project in Prince Edward Island is examining how cow manure can enhance soil health while also reducing greenhouse gas emissions. Under the auspices of the Living Labs P.E.I. initiative, farmers collaborate with researchers from Agriculture and Agri-Food Canada to implement innovative agricultural practices. One of the key participants, Nick Green, utilizes his cattle to graze on over 200 hectares of land, which includes both his own property and parcels owned by fellow farmers. This practice not only fertilizes the soil but also contributes to maintaining its stability.

Green’s approach reflects a shift in farming practices on the island. Historically, farmers maintained mixed operations, growing various crops and raising livestock. Today, many have specialized, focusing on single crops such as potatoes or carrots. Rising costs for chemical fertilizers have made these specialized practices more challenging. Green noted that in one year, his fertilizer costs surged by 100 percent, amounting to tens of thousands of dollars. Using manure directly on fields, however, presents a more economical solution, turning waste into a resource.

Research led by Dr. Judith Nyiraneza aims to determine effective methods for improving soil health while retaining carbon. Nyiraneza emphasizes that while the soil in P.E.I. is conducive to food production, it is also delicate and prone to erosion, particularly due to the island’s topography and strong tides. “Increasing organic matter and nutrients in the soil makes it stronger,” she stated. Early findings from the project indicate that implementing rotational grazing, as Green is doing, has resulted in a 28 percent increase in potato yields.

Despite its long history, rotational grazing has become less popular as farms have expanded. Nyiraneza pointed out that the shift to chemical fertilizers has led to soil degradation, moving backward in terms of soil health. For those farmers hesitant to engage directly with manure, alternative methods are being explored. Dr. Erin Smith, also from Agriculture and Agri-Food Canada, is investigating a targeted injection method for applying manure. This technique minimizes nutrient loss by injecting liquid manure directly into the soil, a method that has shown a 35 percent reduction in nitrogen loss.

Smith believes that the Living Lab framework is crucial for assessing the cost-effectiveness of these agricultural innovations. “Is this technology something farmers should invest in? Is it worth the investment?” she queried. The ongoing research is expected to span approximately three more years, allowing for a thorough analysis of results under various weather conditions. The availability of liquid manure from local dairy and cattle producers supports further experimentation.

As Green observes his cattle’s contributions to addressing climate change, he reflects on the evolving perception of livestock in environmental discussions. While cattle have often been blamed for methane emissions in agriculture, Green asserts, “I’m a firm believer they’re part of the solution, not part of the problem.”

This research initiative not only highlights the potential of manure as a resource but also underscores the importance of innovative farming practices in combating climate change and enhancing soil health. The findings from this project could significantly influence sustainable farming approaches in the region and beyond.