Development of leaf nutrient concentration standards for peach trees in New South Wales

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Abstract
It was postulated that leaf nutrient concentration standards for peach trees developed overseas would be valid in Australia. A compilation of published standards based on 39 studies in seven countries was made. These standards were then tested in the Murrumbidgee Irrigation Areas (M.I.A.), New South Wales, for two seasons by surveying the leaf nutrient concentrations of 20 orchards which had a history of above-average production, good management and an absence of symptoms of malnutrition. Twelve orchards showing symptoms of malnutrition were also surveyed. The survey results indicated that the overseas standards were valid for M.I. A. Golden Queen peach trees in both seasons. All major M.I.A. peach soils were represented in the study, and no evidence was found of any need to modify the standards for the cultivars Stanford, Gaume or Boyce.

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