Abstract

FLOREZ, Sandra L.; MIRANDA, Diego  and  CHAVES, Bernardo. Nutrient dynamic in the vegetative growth phase of lulo (Solanum quitoense Lam.) in response to NaCl salinity. Agron. colomb. [online]. 2008, vol.26, n.2, pp.205-216. ISSN 0120-9965.

The effect of three concentrations of NaCl (0, 30 and 60 mM) on the behavior of mineral ions in lulo plants was evaluated in leaf tissue, leachates and substrates of the culture. The experiment was realized in a plastic greenhouse located in Bogotá (2,556 masl, 15.6 °C mean temperature and 61% relative humidity). Two-months old lulo plants (Solanum quitoense var. quitoense) were transplanted in pots with the following substrates: bleached peat (Klassman®), sand and soil mixture, peat and sand at a 3:1:1 (w/w) ratio; also, an additional treatment (soil) with fertirrigation. As a basic fertilization, a slow liberation fertilizer with minimum salinity effect was applied. An inverse relation was observed between the concentrations of NaCl and the magnitude of growth changes of plants. The height was diminished between 4% and 16% in plants grown in peat and mixture, and 65% for plants in sand. Plants in blond peat diminished their leaf area between 14 and 17% and 65% for plants in sand. The dry mass decreased between 38 and 50% for plants in peat. The content of leaf nutrients was affected by NaCl concentrations. In leachates, Ca²⁺, K⁺ and Mg²⁺ ions increased their concentrations in the organic substrates (peat and mixture). The N concentrations in substrates increased compared to the initial sampling, the same occurred with Na, whereas Ca²⁺, K⁺ and Mg²⁺ decreased their concentrations.

Keywords : growth; fertirrigation; substrates; leachates.

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