Nitrate accumulation in vegetables and its relationship to quality

Blom-Zandstra, M.

doi:10.1111/j.1744-7348.1989.tb06577.x

Cited by 136 publications

(79 citation statements)

References 40 publications

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“…NO 3 and carbohydrates are involved in osmotic adjustment; specifically, their relationship is inversely proportional and is regulated by the intensity of light [36][37][38]. In this study, P-shortages seemed to reduce the N intake and increase carbohydrate production in the lettuce cultivated in system A.…”

Section: Discussionmentioning

confidence: 87%

Nutrient Management in Aquaponics: Comparison of Three Approaches for Cultivating Lettuce, Mint and Mushroom Herb

et al. 2018

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Abstract:Nutrients that are contained in aquaculture effluent may not supply sufficient levels of nutrients for proper plant development and growth in hydroponics; therefore, they need to be supplemented. To determine the required level of supplementation, three identical aquaponic systems (A, B, and C) and one hydroponic system (D) were stocked with lettuce, mint, and mushroom herbs. The aquaponic systems were stocked with Nile tilapia. System A only received nutrients derived from fish feed; system B received nutrients from fish feed as well as weekly supplements of micronutrients and Fe; system C received the same nutrients as B, with weekly supplements of the macronutrients, P and K; in system D, a hydroponic inorganic solution containing N, Ca, and the same nutrients as system C was added weekly. Lettuce achieved the highest yields in system C, mint in system B, and mushroom herb in systems A and B. The present study demonstrated that the nutritional requirements of the mint and mushroom herb make them suitable for aquaponic farming because they require low levels of supplement addition, and hence little management effort, resulting in minimal cost increases. While the addition of supplements accelerated the lettuce growth (Systems B, C), and even surpassed the growth in hydroponic (System C vs. D), the nutritional quality (polyphenols, nitrate content) was better without supplementation.

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Section: Discussionmentioning

confidence: 87%

Nutrient Management in Aquaponics: Comparison of Three Approaches for Cultivating Lettuce, Mint and Mushroom Herb

et al. 2018

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“…Moreover, nitrate, amino acids, proteins, sugars, organic acids, mineral, and vitamins are closely interrelated (Blom-Zandstra 1989;Huang et al 2011). Our previous study suggested that the overall quality of cucumbers was improved by applying VP and VPinorganic mixed fertilizer under greenhouse conditions (Zhao et al 2010a, b).…”

Section: Yield and Quality Responses To Soil Vermicompost Amendmentmentioning

confidence: 99%

Effects of vermicompost amendment as a basal fertilizer on soil properties and cucumber yield and quality under continuous cropping conditions in a greenhouse

Zhao

Zhang

et al. 2017

J Soils Sediments

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Purpose We examined the effects of vermicompost application as a basal fertilizer on the properties of a sandy loam soil used for growing cucumbers under continuous cropping conditions when compared to inorganic or organic fertilizers. Materials and methods A commercial cucumber (Cucumis sativus L.) variety was grown on sandy loam soil under four soil amendment conditions: inorganic compound fertilizer (750 kg/ha,), replacement of 150 kg/ha of inorganic compound fertilizer with 3000 kg/ha of organic fertilizer or vermicompost, and untreated control. Experiments were conducted in a greenhouse for 4 years, and continuous planting resulted in seven cucumber crops. The yield and quality of cucumber fruits, basic physical and chemical properties of soil, soil nutrient characteristics, and the soil fungal community structure were measured and evaluated. Results and discussion Continuous cucumber cropping decreased soil pH and increased electrical conductivity. However, application of vermicompost significantly improved several soil characteristics and induced a significant change in the rhizosphere soil fungal community compared to the other treatments. Notably, the vermicompost amendments resulted in an increase in the relative abundance of Ascomycota, Chytridiomycota, Sordariomycetes, Eurotiomycetes, and Saccharomycetes, and a decrease in Glomeromycota, Zygomycota, Dothideomycetes, Agaricomycetes, and Incertae sedis. Compared to the organic fertilizer treatment, vermicompost amendment increased the relative abundance of beneficial fungi and decreased those of pathogenic fungi. Cucumber fruit yield decreased yearly under continuous cropping conditions, but both inorganic and organic fertilizer amendments increased yields. Vermicompost amendment maintained higher fruit yield and quality under continuous cropping conditions. Conclusions Continuous cropping decreased cucumber yield in a greenhouse, but basic fertilizer amendment reduced this decline. Moreover, basal fertilizer amendment decreased beneficial and pathogenic fungi, and the use of vermicompost amendment in the basic fertilizer had a positive effect on the health of the soil fungal community.

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“…Under conditions of increased nitrogen supply the potato crop has the ability to take up nitrogen in excess to that required for growth and store it as nitrate in the vacuoles (Millard and Marshall 1986). Potato tubers normally have low nitrate content, not exceeding 300 mg kg -1 in fresh matter (Blom-Zandstra 1989). The nitrate content of the tubers depends on cultivar, availability of nitrogen during tuber growth and environmental factors.…”

Section: Introductionmentioning

confidence: 99%

Yield formation and quality characteristics of early potatoes during a short growing period

Mustonen¹

2008

AFSci

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The effects of nitrogen fertilization on the yield and quality of early potato (Solanum tuberosum L.) were studied at MTT Agrifood Research Finland during 1996-1997. Cultivars were harvested at three times. The experimental layout was a split-split-plot with harvest times as main plots and nitrogen fertilization and potato cultivars as the subplots. The fertilizer treatments were 60 and 120 kg N ha -1 and the cultivars tested were Timo, Gloria and Van Gogh. The harvest times were 57-62, 70-75 and 85-90 days after planting. Application of 120 kg N ha -1 intensifi ed canopy development and increased leaf area of the stands. At early harvest the tuber yield of all cultivars receiving the higher nitrogen application increased by 0.5-2.5 t ha -1 . The highest yielding cultivar was Timo. At last harvest, the higher nitrogen treatment increased yield by 3.0-6.2 t ha -1 . The highest yielding cultivars were Timo and Van Gogh. The dry matter content of tubers was very low, 13.8-17.2%, at the fi rst harvest and the higher nitrogen application reduced dry matter content by 0.3-1.0%. The highest fertilizer application rate resulted in the largest tuber size. Nitrogen application, however, affected the quality of potatoes by decreasing the dry matter content. The nitrate content in tubers increased signifi cantly with the increasing level of nitrogen. The range of nitrate content in tubers fl uctuated between 13 and 189 mg kg -1 fresh weight showing good controlling of nitrate values. Harvest time affected sucrose content and the reducing sugar content in tubers, but nitrogen fertilizer did not change the sugar content of tubers. As tuber yield and quality during a short growing season are affected mainly by intercepted radiation, methods to increase tuber yield should focus on reducing the time to emergence, improving haulm growth after emergence and increasing the harvest index.

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Nitrate accumulation in vegetables and its relationship to quality

Cited by 136 publications

References 40 publications

Nutrient Management in Aquaponics: Comparison of Three Approaches for Cultivating Lettuce, Mint and Mushroom Herb

Nutrient Management in Aquaponics: Comparison of Three Approaches for Cultivating Lettuce, Mint and Mushroom Herb

Effects of vermicompost amendment as a basal fertilizer on soil properties and cucumber yield and quality under continuous cropping conditions in a greenhouse

Yield formation and quality characteristics of early potatoes during a short growing period

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