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The Accumulation of Nutrients and Contaminants in Aromatic Plants Grown in a Hydroponic System

References Al-Chalabi M., 2015. Short communication Vertical farming: Skyscraper sustainability? Sustainable Cities and Society 18, p. 74-77. Benke K., Tomkins B., 2017. Future food-production systems: vertical farming and controlled-environment agriculture, Sustainability. Science, Practice and Policy, 13:1, p. 13-26. Boc V., Streza I., 2014. Floating hydroponic crops proposal: Tonle Sap Lake, Cambodia. Scientific Papers. Series B, Horticulture. Vol. LVIII., p.245-248. Chira L., Chira A., Delian

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Alleviation Effect of Selenium on Manganese Stress of Plants

, Kleiber T, Trelka T. Quality of water used for drip irrigation and fertigation of horticultural plants. Folia Hort. 2010;22(2):67-74. http://www.ptno.ogr.ar.krakow.pl/Wydawn/FoliaHorticulturae/Spisy/FH2010/PDF22022010/fh2202p10.pdf . [7] Kleiber T. Effect of manganese nutrition on content of nutrient and yield of lettuce (Lactuca sativa L.) in hydroponic. Ecol Chem Eng S. 2014;21(3):529-537. DOI: 10.2478/eces-2014-0039. [8] Kleiber T. Changes of nutrient contents in tomato fruits under the influence of increasing intensity of manganese nutrition. Ecol Chem

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Determination of lithium bioretention by maize under hydroponic conditions

References Alexander, B., Browse, D.J., Reading, S.J. & Benjamin, I.S. (1999). A simple and accurate mathematical method for calculation of the EC50, Journal of Pharmacological and Toxicological Methods, 41 (2-3), pp. 55-58. DOI:10.1016/S1056-8719(98)00038-0 Allender, W.J., Cresswell, G.C., Kaldor, J. & Kennedy, I.R. (1997). Effect of lithium and lanthanum on herbicide induced hormesis in hydroponically-grown cotton and corn, Journal of Plant Nutrition, 20, 1, pp. 81-95. DOI:10.1080/01904169709365235 Al

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137Cs Uptake and Translocation in Leafy Vegetable: a Study with Lactuca Sativa L. Grown Under Hydroponic Conditions

developed to control pH and concentration of nutrient solution evaluated in hydroponic lettuce production. Comput. Electron. Agr., 84, 2012, 53- 61. DOWDALL, M., STANDRING, W., SHAW, G., STRAND, P.: Will global warming affect soil-to-plant transfer of radionuclides? J. Environ. Radioact., 99, 2008, 1736- 1745. ESCOTO, M., FERNÁNDEZ, J., MARTÍN, F.: Determination of phytotoxicity of soluble elements in soils, based on a bioassay with lettuce ( Lactuca sativa L.). Sci. Total Environ., 378, 2007, 63-66. FARRÉ, M., BARCELÓ, D

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Effect of Manganese Nutrition on Content of Nutrient and Yield of Lettuce (Lactuca Sativa L.) in Hydroponic/Wpływ Żywienia Manganem Na Zawartość Składników I Plonowanie Sałaty (Lactuca Sativa L.) W Hydroponice

;38(2):45-53. [7] Abou-Hadid AF, Abd-Elmoniem EM, El-Shinawy MZ, Abou-Elsound M. Electrical conductivity effect on growth and mineral composition of lettuce plants in hydroponic system. Acta Hortic. 1996;434:59-66 [8] Samarakoon UC, Weerasinghe PA, Weerakkody WAP. Effect of electrical conductivity [EC] of the nutrient solution on nutrient uptake, growth and yield of leaf lettuce (Lactuca sativa L.) in stationary culture. Trop Agric Res. 2006;18:13-21. [9] Kleiber T, Markiewicz B. Tolerancja sałaty (Lactuca sativa L.) na zasolenie. Część III

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Hydroponic pH Modifiers affect Plant Growth and Nutrient Content in Leafy Greens

REFERENCES Ahn D.-H., Ikeda H. 2004. Effects of pH and concentration of nutrient solution on growth of hydroponically cultured Chinese chive ( Allium tuberosum Rottler). Horticultural Research (Japan) 3: 191–194. DOI: 10.2503/hrj.3.191. [in Japanese with English abstract] Ali M.B., Khandaker L., Oba S. 2009. Comparative study on functional components, antioxidant activity and color parameters of selected colored leafy vegetables as affected by photoperiods. Journal of Food, Agriculture and Environment 7: 392–398. Arancon N.Q., Schaffer N

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Effect of Nitrogen Form and Type of Polyethylene Film Covering Tunnel on Nutrient Content of Hydroponically Grown Sweet Pepper

Effect of Nitrogen Form and Type of Polyethylene Film Covering Tunnel on Nutrient Content of Hydroponically Grown Sweet Pepper

The effect of nitrogen form (nitrate or nitrate-ammonia-amide) and a type of polyethylene film (two types, differing light transmission, light dispersion and PAR) covering a tunnel on the content of macroelements in the leaves of sweet pepper being in different stages of growth were studied. The plants were grown in rockwool slabs, using a drip fertigation system without recirculation. In each part of the tunnel there were two sets of cultivation gutters independently supplied with nutrient solution containing different forms of nitrogen: nitrate (100% N-NO3), nitrate-ammonia-amide (50% N-NO3, 13% N-NH4, 37% N-NH2).

Dry matter and mineral composition were determined in the leaves with petioles. The leaves were collected in three stages of growth, e.g. intensive vegetative growth, flowering and full fruiting.

The plants fed with nitrate N form contained more Ca and Mg, irrespective of a type of polyethylene film and stage of growth. N form had no effect on K content, except in plants being in flowering. In all stages of growth, irrespective of a type of polyethylene film, the plants fed with nitrate-ammonia-amide N form accumulated more N.

The effect of a type of polyethylene film covering a tunnel on nutritional status of the plants being in stage of intensive vegetative growth or flowering was not univocal. However, in fruiting chemical composition, except N content in year 2007, did not depend on a tunnel part.

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Nitrogen Uptake and Free Amino-acid Accumulation in Roots of Lotus corniculatus Cultivars under Al-stress

Abstract

Nitrogen uptake and free amino acid accumulation was evaluated in two South American cultivars of Lotus corniculatus L. differing in their tolerance to Al stress. The uptake of nitrate was affected by 1 mM Al more in the sensitive cultivar INIA Draco than in a relatively tolerant UFRGS (the uptake rate was 39.1% and 52.9%, respectively, of the control value at pH=5.5), whereas the opposite was true for the uptake of ammonia (60.1% and 50.1%). Treatment with Al also decreased the free amino-acid level to similar extent in both cultivars, mostly due to the significantly decreased level of asparagine (p = 0.003 and 0.026, respectively), the dominant amino-acid in Lotus roots. On the other hand, accumulation of stress metabolite - proline was achieved that was up to 5 time higher than in control. No considerable differences in this accumulation in INIA Draco and in UFRGS were found, so it is rather unlikely that proline content could contribute to the differences in Al-tolerance between the cultivars.

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Drought Tolerance Studies in Wheat (Triticum Aestivum L.)

Abstract

Wheat is a foremost staple food crop of Pakistan and plays a vital role for stability of country's economy and people's food requirement. Shortage of water has remained a consistent problem for the farmers over past few years and different agronomic techniques have been introduced into the limelight. But there is an immense scope of making some genetic manipulations to improve/enhance the drought tolerance of wheat. It has been observed by many researchers that yield in drought stress conditions, is a fine fusion of the traits like days taken by crop to reach physical maturity, water use efficiency, crop water use and harvest index. Drought being one of the main limiting factors of wheat production should be highly preferred in the future wheat improvement programs.

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Physiological reaction of basket willow (Salix viminalis L.) to copper excess in hydroponic medium

Abstract

The influence of copper salt, in a concentration range of 50–150 mg·dm−3, on the physiological response of basket willow was studied on Tora variety, which were grown in hydroponics. Content of assimilation pigments, relative water content (RWC), water saturation deficit (WSD), intensity of assimilation and transpiration, stomatal conductance, photosynthetic rate of water use efficiency (WUE) and instantaneous photosynthetic rate of water use (WUEI) were determined in leaves. It was observed that the decrease in the concentration of tested physiological parameters correlated with the increase in copper salt doses in the medium. The assimilation and transpiration of basket willow were significantly limited by stomata. The addition of copper salt to the medium increased WSD in leaves of the basket willow. The obtained results of the studied physiological parameters may prove useful for the assessment of resistance of the studied willow cultivar to stress caused by increased copper ion content in medium and its applicability in reclamation of areas degraded by humans.

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