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Copper-Deficiency Disease of Apple Trees [PDF]

Nature, 1950
THE communication by Mr. J. O. Jones1 dealing with the copper-deficiency disease of pear trees has tempted me to write briefly of my experience of the summer-spraying of apple trees in Northern Ireland with Bordeaux mixture. In the early nineteen-twenties, the 6,000 acres of apple orchards in the north of County Armagh and the south of County Antrim ...
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Nitrogen Metabolism of Apple Trees

Nature, 1953
IN most plants nitrate is the form in which nitrogen is absorbed from the soil and translocated upwards from the roots. Accumulation of nitrate in upper parts of the plant may follow, nitrate reduction and formation of organic nitrogen compounds occurring in many organs.
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Prediction of Nitrogen, Phosphorus, and Potassium Contents in Apple Tree Leaves Based on In-Situ Canopy Hyperspectral Reflectance Using Stacked Ensemble Extreme Learning Machine Model