Abstract
To study the relationship of fertilizer formulation, method of application, and cold storage conditions to the fruit quality and sensitivity to internal browning of local race Zacatecas-type peach, research was done in an orchard with ten-year-old trees that had been managed under minimum tillage for five years. Three formulations of soil applied NPK were compared, each of them with o without foliar supply (F) of Ca, Mg, B and Mo. The variables evaluated were firmness, color, titratable acidity, total soluble solids, ethanol, acetaldehyde, total phenols, polyphenoloxidase, and phenylalanine ammonia-lyase. Soil and foliar fertilizers with lower N content increased pulp firmness. This effect persisted during storage at both 5 °C and room temperture. Soil and foliar applications of fertilizers with higher N content reduced fruit firmness, while those with higher K content increased the fruit content of phenols. Foliar fertilization improved external fruit color and reduced the activity of phenylalamine ammonia-lyase and polyphenoloxidase. Both soil and foliar applications significantly changed content of total soluble solids, malic acid and ethanol. Applications with higher N favored snthesis of acetaldehyde. Fruits stored both under refrigeration and at room temperature ripened normally.
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