It’s important to understand the nutrient content of your slurry to enable reliable fertiliser planning. It’s best to measure or at least estimate this rather than rely on guesswork. Make sure the sample taken for analysis is the equivalent of an ‘average’ of what is found in your store. To do this, take several samples from various positions within the store, mix them together and then take a representative sub sample. This can then be analysed in a laboratory or be tested with a slurry N meter or slurry hydrometer on the farm.