NY013 - Improved Nitrogen Management of Container Plants Grown In Media Containing Woodwaste

There is an increasing trend in the nursery industry towards the manufacture and use of potting media containing high proportions of wood wastes. A major problem confronting nursery producers using media made from composted wood wastes is the variability in nitrogen drawdown, and the consequent variability in nitrogen requirements for optimum growth in such media. The report covers the following objectives. To survey grower practice and documents the physical and chemical properties of potting media components available or in use in QLD, development of an ND test for characterizing media with severe nitrogen drawdown, determining whether nitrogen test strips can be used by nursery operators to identify the NDI of media at the nursery site, and to determine recommendations for nitrogen fertilization using slow release and liquid fee formulations based on the NDI of the medium.