BioNutrients Nutritional sources that are easily absorbed by plants and complement soil biology BioSilicate is a unique liquid silicon product that delivers silicon nutrition in combination with humates so that the silicon is stable, and rapidly absorbed by plants. Bio-Irn is a new formulation which provides a number of benefits over conventional iron fertiliser formulations. It utilises the organic acids that plants naturally use to absorb and transport iron. It is therefore more in balance with natural processes. For this reason it is also faster acting than iron sulphate.