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Journal of soil science and plant nutrition

versão On-line ISSN 0718-9516

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ESTRADA-ORTIZ, E et al. The effects of phosphite on strawberry yield and fruit quality. J. Soil Sci. Plant Nutr. [online]. 2013, vol.13, n.3, pp.612-620.  Epub 27-Ago-2013. ISSN 0718-9516.  http://dx.doi.org/10.4067/S0718-95162013005000049.

Phosphite (H2PO3-; Phi) has been shown to increase fruit quality and activate plant defense mechanisms in plants when provided in a nutrient state with sufficient phosphorous. In this study, five solutions containing different percentages of Phi (0, 20, 30, 40 and 50%) in Steiner's solution were evaluated during the flowering and fructification stages; the Steiner' s nutrient solution was kept al 50% during the flowering stage and at 75% from the beginning of the fructification stage on. The objective was to determine the effects of phosphite on total P concentration in leaves, yield, pH, electrical conductivity (EC), anthocyanin concentration, and fruit size of strawberries (cv. Festival). The experiments were performed in a tunnel-type greenhouse using drip irrigation and volcanic rock (volcanic gravel) as substrate. In the fruit development phase, the concentration of P in the leaves was proportional to the level of Phi used. Although no significant differences were observed when compared to the control, the addition of 20% Phi slightly improved yield and fruit size. The highest pH, EC and anthocyanin concentration were identified in the fruit of plants treated with 30% Phi. Our findings suggest that supplying Phi at 30% or less in the nutrient solution does not significantly affect yield but does affect fruit quality and activates plant defense mechanisms by producing a higher concentration of anthocyanins.

Palavras-chave : Fragaria x ananassa Duch; anthocyanins; electrical conductivity of fruit; pH of fruit; fruit size.

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