The Effect of Orchard Factors on the Chemical Composition of Apples IV. Some Effects of Soil Management and NPK Fertilizers

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Abstract
Summary Samples of Cox’s Orange Pippin fruit from a soil management and manurial trial in which no fertilizers, or all combinations of थ, ऩ and K, were applied to the soil of plots in grass sward or clean cultivation were analysed in three years. Fruits from potassium and sward treatments had higher concentrations of potassium and magnesium, and usually lower nitrogen concentrations. Application of phosphate, especially in the presence of sward, increased phosphorus concentrations in the fruit, but with sward treatments phosphorus concentrations were increased only when phosphate was applied. Nitrogenous fertilizer raised nitrogen concentrations in the fruit but did not lower those of phosphorus. Potassium concentrations in the fruit and leaves were correlated in all years, but those of phosphorus and nitrogen were not. Titratable acidity increased with potassium concentration, but calcium concentration was unrelated to mean mass per apple and was low in relation to expected levels in two of the three years.

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