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vol.24 número1EVALUACIÓN TÉCNICO-ECONÓMICA DE LA PRODUCCIÓN DE CALAS DE COLOR EN LA REGIÓN DE LA ARAUCANÍA, CHILEINDUCCIÓN FLORAL DE ARRACACHA (ARRACACIA XANTHORRHIZA BANCROFT) índice de autoresíndice de materiabúsqueda de artículos
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Idesia (Arica)

versión On-line ISSN 0718-3429

Resumen

CARRASCO, Gilda; TAPIA, Jaime  y  URRESTARAZU, Miguel. NITRATE CONTENT IN LETTUCES GROWN IN HYDROPONIC SYSTEMS. Idesia [online]. 2006, vol.24, n.1, pp.25-30. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292006000100005.

The nitrate content in leafy vegetables grown in hydroponic systems was studied. High levels of nitrate may be hazardous to human health. The European Commission indicates that lettuce plants grown in a greenhouse in winter should contain a nitrate concentration below 4,500 mg/kg (fresh weight). This study determined the nitrate contents of lettuces grown by  float and nutrient film technique (NFT) in hydroponic systems, in greenhouse without a heating system at winter time. Four trials were carried out in Talca, Chile (south hemisphere) from May to September. Three cultivars of type butterhead lettuces (Lactuca sativa L. var. capitata): “Loreto”, “Floresta” and “Esmeralda” were evaluated. In the float system, the leafy nitrate content fluctuated between 1,344 and 3,839 mg/ kg and from 1,754 to 2,157 mg/kg at beginning and end of winter, respectively. The nitrate contents in lettuces grown in NFT, fluctuated from 2,552 to 2,818 mg/kg and between 2,676 to 3,100 mg/kg at beginning and end of winter time, respectively. Neither of lettuce cultivars surpassed the maximum nitrate content stipulated by the European Commission, nor were there consistent differences among them.

Palabras clave : Leafy vegetables; soilless culture; human health.

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