2009
DOI: 10.1590/s0100-40422009000600049 View full text |Buy / Rent full text
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Abstract: Recebido em 29/7/08; aceito em 25/2/09; publicado na web em 25/6/09Lettuce is worldwide known as the most important vegetable. In this context, most farmers are searching new techniques for best quality products including hydropony. However, nitrate is of great concern, since it has a negative impact on human metabolism. The main objective of the present work was to evaluate the nitrate content of lettuce produced by conventional and hydroponic systems. The determination was conducted by ion chromatography and… Show more

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“…In a hydroponic system, it is especially important to control the amount of nutrients in order to allow or deny plants the accumulation of beneficial nutrients or undesirables, such as nitrate. For instance, Novaes et al [24] reported that lettuces cultivated via a hydroponic system (71.5 g/kg dry weight (DW)) presented significantly higher nitrate concentrations than those conventionally cultivated in soil (29.8 g/kg DW).…”
Section: Introductionmentioning
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“…In a hydroponic system, it is especially important to control the amount of nutrients in order to allow or deny plants the accumulation of beneficial nutrients or undesirables, such as nitrate. For instance, Novaes et al [24] reported that lettuces cultivated via a hydroponic system (71.5 g/kg dry weight (DW)) presented significantly higher nitrate concentrations than those conventionally cultivated in soil (29.8 g/kg DW).…”
Section: Introductionmentioning
“…Many extraction methods and techniques have also been reported for nitrate analysis in plants and vegetables. Various extraction solutions were used, such as cold or hot distilled water [9][10][11][12][13][14][15][16], solvents as alkaline solutions [17], or methanol [18]. Furthermore, numerous extraction methods including maceration, shaking, immersion heating, or microwave technology were involved.…”
Section: Introductionmentioning