COELLO-PEREZ, Anabel; CHINEA-CORREA, Eduardo Antonio    CORBELLA-TENA, Miguel. Effect of phosphite on growth and foliar nutrient concentration of Solanum licopersicum L. []. , 71, 3, pp.295-302.   12--2024. ISSN 0120-2812.  https://doi.org/10.15446/acag.v71n3.105925.

Phosphite (; Phi) is a reduced form of phosphate (; Pi) used in agriculture as a fungicide, fertilizer and biostimulator. In this study, the fertilizing capacity of Phi was assessed in a hydroponic tomato crop (Solanum licopersicum L.) with different levels of Pi, in an inert substrate and with artificial lighting. A randomized complete block experimental design with six treatments and five replications was used. The treatments were assigned following a factorial model (3 x 2) with three levels of Pi (0.05, 1.00 and 2.00 mmol L-1) and presence (1.00 mmol L-1) or absence of Phi. The existence of significant differences between the variables was established by an ANOVA test and, when appropriate, Duncan’s Test (P< 0.05) was applied to separate the means. The average dry weight (aerial part) of the seedlings cultivated with 2 mmol L-1 of Pi was higher (4.40 g) than that of those cultivated with 0.05 mmol L-1 of Pi (2.24 g) (P< 0.05), and the average dry weight of the seedlings cultivated without Phi (0.00 mmol L1) was higher (3.93 g) than that of those cultivated with 1 mmol L1 of Phi (2.80 g) (P< 0.05). The concentration of Pi in the nutrient solution influenced the foliar concentration of P, Zn, Cu and Mn, and the concentration of Phi influenced that of P. The interaction Pi x Phi was significant for the foliar levels of P and Zn. The results indicate that the seedlings took Pi and Phi, but only the P supplied as Pi favored their growth.

: sand; fertilization; phosphorus; nutrition; toxicity.

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