Phosphorus source comparison trial has flawed methodology

Review by Patrick Francis
The Wongwibinda, Northern Tablelands New South Wales fertiliser trial was established through local farmer interest in composts as an alternative source of phosphorus and other plant nutrients to chemical fertilisers for lifting and maintaining livestock productivity on pasture. Unfortunately the trial has produced biased results because the rates of phosphorus applied with superphosphate are significantly higher than those applied with composts. The trial site was considered to be phosphorus deficient.

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