Manures and slurries contain readily available nutrients that can be used as alternatives to bagged fertiliser.
However in order to use manures and slurries at the best rate possible, you need to know what they contain and then reduce bagged fertiliser accordingly.
The best way of knowing the nutrient content of manures is to have them analysed regularly. The following information is based on the average nutrient content of slurry for a range of dry matter contents.
Why is dry matter important?
Establishing the dry matter is important in determining the nutrient content of manure as it influences the concentration of N, P and K that are available to the crop you are applying it to.
Click here to see the nutrient content of cattle slurry at a range of dry matter concentrations.
What is the approximate dry matter content of my slurry?
Do you work in units rather than kgs? Click here to access the figures in old money!
Once you have decided on the approximate dry matter content of your slurry, use the table to work out the available nutrients from the material.