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The effects of different levels of phosphorus fertilization and water provision on the mineral nutrition of two clonal rootstocks of  Prunus  were studied. Two-year-old  Prunus  seedlings, Hybrid GF677 ( Prunus persica  ×  Prunus amygdalus ) (PH) and Pollizo Puebla de Soto 101 ( Prunus insititia ) (PI) were planted in an uncultivated calcareous soil (a Xeric torriorthent derived from marl) under greenhouse conditions. They were drip irrigated with subterranean water of slightly alkaline pH (7.63), EC 0.88 dS·m –1 , with a low chloride and high sulphate content. The experiment lasted two annual cycles. In October of the second year the leaf nutrient concentration and dry weight of the total leaf weight were determined in four trees of each combination of rootstock × irrigation level × fertilization treatment. The nutritive state of these trees was analyzed by vector analysis. The results point to a highly significant influence of the rootstock nature on the leaf concentrations of most nutrients. Very low Zn and Cu concentrations were recorded on both rootstocks, for both irrigation levels and several fertilizing treatments. Vector analysis confirmed the Cu deficiency resulting from several of the fertilizing treatments and both irrigation levels in PH rootstocks.

Mineral Nutrition of Prunus Rootstocks: Leaf Concentrations and Diagnosis by Vector Analysis