Nitrate contents in some vegetables in Tunisia

Razgallah, Nesrine; Chikh-Rouhou, H.; Boughattas, Iteb; Mahmoud, Mahmoud A.

doi:10.1080/03650340.2015.1072623

Cited by 21 publications

(7 citation statements)

References 32 publications

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“…The range between 100 and 150 kg N ha −1 is recommended for the species to meet yield level, production cost, and leaf quality, allowing to keep low nitrate content below safe limits and avoid a negative impact on leaf nutritional value. In a survey study on nitrate content of 22 vegetable species produced in Tunisia under organic and conventional farming systems [12], significant differences were observed in Swiss chard nitrate content (1176 vs. 2243 mg kg −1 fresh weight-Fw, respectively).…”

Section: Introductionmentioning

confidence: 99%

Biochar, Vermicompost, and Compost as Soil Organic Amendments: Influence on Growth Parameters, Nitrate and Chlorophyll Content of Swiss Chard (Beta vulgaris L. var. cycla)

2020

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Soil addition with organic amendments is an issue that receives growing attention in the agricultural sector. However, the effects of such materials on plant growth and crop yield are highly variable in the literature. This study aims to evaluate the influence of soil addition with biochar (from vine pruning residues), vermicompost (from cattle manure), and three different composts (from olive pomace or cattle anaerobic digestate), on the quali-quantitative response of Swiss chard (Beta vulgaris L. var. cycla) grown in pots. The organic amendments were applied to the soil in two doses to provide 140 and 280 kg N ha−1, respectively. Two growth cycles were considered, and, at each leaf cut, plants were analyzed for growth parameters (height, fresh weight, leaf number, and leaf area) and qualitative characteristics (nitrogen, nitrate, and pigment leaf content). Swiss chard responded positively to organic amendment and, particularly when the soil was treated with compost from animal wastes, higher plant growth and pigment leaf content were observed. Nitrate leaf content was always well below the NO3− thresholds established by the European Commission Regulations. Biochar application did not show a positive effect on the quali-quantitative characteristics of Swiss chard, likely due to benefits that may be achieved over time.

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Section: Introductionmentioning

confidence: 99%

Biochar, Vermicompost, and Compost as Soil Organic Amendments: Influence on Growth Parameters, Nitrate and Chlorophyll Content of Swiss Chard (Beta vulgaris L. var. cycla)

2020

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“…However, Swiss chard is among the leafy vegetables accumulating excessive nitrate amount, with over 60% in the petiole [15][16][17]. Several studies [18,19] showed that high N fertilization levels negatively affect the quality of Swiss chard leaves, instead Razgallah et al [20] found lower nitrate content in organically than conventionally cultivated Swiss chard. In this context, the application of organic amendments to Swiss chard cultivation, could be a way to reduce or even replace the inorganic fertilization, while assuring plant nutrition, crop yield, and quality.…”

Section: Introductionmentioning

confidence: 99%

Quanti-Qualitative Response of Swiss Chard (Beta vulgaris L. var. cycla) to Soil Amendment with Biochar-Compost Mixtures

Libutti

Rivelli

2021

Agronomy

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In recent years, soil addition with organic amendments, such as biochar and compost, has gained attention as an effective agronomic practice to sustain soil fertility, enhance plant growth and crop yield. Well known are the positive effects of compost on yield of a wide crop varieties, while both positive and negative responses are reported for biochar Therefore, the aim of the study was to verify the effect of biochar mixed with three types of compost on quanti-qualitative response of Swiss chard (Beta vulgaris L. cycla), a leafy green vegetable rich in dietary antioxidants, largely consumed worldwide. A factorial experiment in pots with two factors, including biochar (without biochar and with biochar from vine pruning residues) and compost (without compost, with compost from olive pomace, with vermicompost from cattle manure, and with compost from cattle anaerobic digestate), was setup. Two growth cycles were considered, and a set of quantitative (height of plants, number, area and fresh weight of leaves) and qualitative parameters (carotenoids, chlorophyll, total N, and NO3−content of leaves) were analyzed. Biochar decreased plant growth and NO3− leaf content; on the contrary, it increased total N leaf content, while compost improved all the considered parameters. The interactive effect of biochar and compost was evident only on total N and NO3− leaf content. In our experimental conditions, the compost showed to be the best option to improve Swiss chard growth and increase the content of phytopigments, while the biochar-compost mixtures did not produce the expected effect.

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“…The problem of high nitrate content in vegetables, fruits, meat, and dairy products is relevant for scientists in different countries [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Nitrate content in vegetables and fruits in Russia and Mongolia

et al. 2020

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This article deals with the actual problem of high nitrate content in vegetables and fruits. The literature review describes the consequences of increased nitrate concentration in the human body and the diseases associated with it. Different countries have different standards for the content of nitrates in agricultural products and the maximum permissible daily doses. The increased content of nitrates negatively affects human health, so it is necessary to maintain strict control over compliance with the concentration standards to the maximum permissible concentrations. Research was carried out on the content of nitrates in vegetables and fruits purchased in the trade networks of the two countries in Russia and Mongolia. The measurements were performed using a portable nitrate -tester SOEKS. As a result of the study, it was found that agricultural products purchased in the trade network of Ulan Bator (Mongolia) meet the established standards, in fruits purchased in St. Petersburg (Russia) in excess of tangerines 1.5 times and 1.6 times. The products that were found to contain excess nitrates were imported from China.

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Nitrate contents in some vegetables in Tunisia

Cited by 21 publications

References 32 publications

Biochar, Vermicompost, and Compost as Soil Organic Amendments: Influence on Growth Parameters, Nitrate and Chlorophyll Content of Swiss Chard (Beta vulgaris L. var. cycla)

Biochar, Vermicompost, and Compost as Soil Organic Amendments: Influence on Growth Parameters, Nitrate and Chlorophyll Content of Swiss Chard (Beta vulgaris L. var. cycla)

Quanti-Qualitative Response of Swiss Chard (Beta vulgaris L. var. cycla) to Soil Amendment with Biochar-Compost Mixtures

Nitrate content in vegetables and fruits in Russia and Mongolia

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