Hi Niall. Grass whey fertiliser, a byproduct of the grass biorefinery process, offers a sustainable and nutrient-rich alternative to conventional fertilisers. With nitrogen, phosphorus, and potassium levels comparable to slurry : 1.8 N, 0.45P, 4.05K Kg's/M3. Using grass whey reduces reliance on mineral fertilisers, supports nutrient recycling by closing the nutrient loop, and minimizes environmental losses. It improves nitrogen use efficiency in livestock and contributes to a zero-waste, circular farming model. Additionally, it increases the overall value of grass and strengthens local bio economies by turning a common biomass,grass, into a high-value resource.