Onyx-- is an organic molasses based compound 2-4mm granule fertiliser. Manufactured from processed molasses and the pelleted in to a perfect spherical black prill. This unique arganic based fertiliser delivers nitrogen, potassium, trace elements and significant levels of amino acids.

Produced from concentrated plant extracts that have significant bio-stimulation properties as well as supplying macro and micro nutrients.

    Humphry Davy can also manufacture spreadable granular fertilisers to a bespoke formulation for you. We can manufacture a huge range of N-P-K products.