Evaluation of nitrate residual in lettuce irrigated with different concentrations of the anion
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Abstract
In Corrientes province, Argentina, lettuce cultivation represents 54 % of the total national crop, but also presents the problem of high nitrate concentrations in water used for irrigation and consumption. The aim of this study was to determine the nitrate residual in lettuce leaves (Lactuca sativa L.) var Brisa and growth parameters of plants irrigated with water containing different concentrations of nitrate. The trial was carried out in a greenhouse, in an Udipsament-argic soil, in 3 L pots. Treatments, with five replicates, were: T0 (control): pots were irrigated with water containing 0 mg NO3 -L-1, T1: pots irrigated with water containing 25 mg NO3 -L-1, T2: irrigated with 50 mg NO3 -L-1, T3: irrigated with 75 mg NO3 -L-1, T4: irrigated with water containing 100 mg NO3 -L-1. Lettuces, produced in winter period and that received nitrate through irrigation, presented higher foliar nitrate concentration compared to the control. In addition, irrigation with 100 ppm nitrate was associated with leaf nitrate concentration, whole plant dry mass, and plant aerial part dry mass and leaf length. While, the control and treatment with 25 ppm nitrate were associated with the number of leaves. Lettuces produced with irrigation with 75 and 100 ppm nitrate had leaf nitrate values that considerably exceeded the standards, making them unsuitable for human consumption.
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