Anjana, S. U., Umar S.A., & Iqbal, M. (2007). Nitrate accumulation in plants, factors affecting the process, and human health implications. A review. Agronomy for sustainable development, 27(1), 45-57. https://doi:10.1051/agro:2006021
AOAC (Official Methods of Analysis). (2002). Association of Official Agricultural Chemists. Washington, D.C., 15th ed. (Vol. 1), 136-138.
Bajaj, K. & Kaur, G. (1981). Spectrophotometric determination of L-ascorbic acid in vegetables and fruits.
Analyst,
106, 117-120.
https://doi.10.1039/AN9810600117
Biesiada, A., A. Nawirska-Olszańska, A. Kucharska, A. Skol-Letwska & K. Kedra. (2010). The effect of nitrogen fertilization on nutritive value and antioxidative activity of red cabbage. Acta Scientiarum Polonorum Hortorum Cultus, 9(2), 13–21.
Bruce, R. C. & Rayment, G. (1982). Analytical methods and interpretations used by the Agricultural Chemistry Branch for soil and land use surveys, Queensland Department of Primary Industries.
Charman, P. & Roper, M. (2007). Soil organic matter. In Soils–their properties and management. 3rd edn.(Eds PEV Charman and BW Murphy.) pp. 276–285. Oxford University Press: Melbourne.
Dzida, K. & Pitura, K. (2008). The influence of varied nitrogen fertilization on yield and chemical composition of Swiss chard (Beta vulgaris L. var. cicla L.). Acta Scientiarum Polonorum Hortorum Cultus, 7, 15-24.
Dzida, K., Jarosz, Z. & Michałojc, Z. (2012). Effect of nitrogen fertilization on the yield and nutritive value of Beta vulgaris L.
Journal of Elementology,
17, 19-29.
https://doi.org/10.5601/jelem.2012.17.1.02
Echer, D., Zoz, T., Rossol, C. D., Steiner, F., Castagnara, D. D. & Lana, M. D. C. (2012). Plant density and nitrogen fertilization in Swiss chard.
Horticultura Brasileira,
30, 703-707.
https://doi.org/10.1590/S0102-05362012000400023
Gao, Z.-J., Han, X.-H. & Xiao, X.-G. (2009). Purification and characterization of polyphenol oxidase from red Swiss chard (Beta vulgaris subspecies cicla) leaves.
Food Chemistry,
117, 342-348.
https://doi.org/10.1016/j.foodchem.2009.04.013
Hasan, M., Tahsin, A., Islam, M., Ali, M. & Uddain, J. (2017). Growth and yield of lettuce (
Lactuca sativa L.) influenced as nitrogen fertilizer and plant spacing.
Journal of Agriculture and Veterinary Science, (IOSR-JAVS),
10, 62-71.
https://doi.org/10.9790/2380-1006016271
Holford, I. & Cullis, B. R. (1985). Effects of phosphate buffer capacity on yield response curvature and fertilizer requirements of wheat in relation to soil phosphate tests.
Soil Research,
23, 417-427.
https://doi.org/10.1071/SR9850417
Hoque, M. M., Ajwa, H., Othman, M., Smith, R. & Cahn, M. (2010). Yield and postharvest quality of lettuce in response to nitrogen, phosphorus, and potassium fertilizers. HortScience, 45, 1539-1544.
Knežević M., D. Đurović, B. Mugoša, M. Strunjaš and Topalović, A., (2014). Relationships between parameters of soil and chard (Beta vulgaris L. var. Cicla L.), Agriculture & Forestry, 60(3), 275-283, Podgorica.
Kolota, E. & Chohura, P. (2015). Control of head size and nutritional value of cabbage by plant population and nitrogen fertilization. Acta Scientiarum Polonorum Hortorum Cultus, 14, 75-85.
Kolota, E. & Czerniak, K. (2010). The effects of nitrogen fertilization on yield and nutritional value of swiss chard. Acta Scientiarum Polonorum Hortorum Cultus, 9, 31-37.
Konstantopoulou, E., Kapotis, G., Salachas, G., Petropoulos, S. A., Karapanos, I. C. & Passam, H. C. (2010). Nutritional quality of greenhouse lettuce at harvest and after storage in relation to N application and cultivation season.
Scientia Horticulturae,
125, 93. e1-93. e5.
https://doi.org/10.1016/j.scienta.2010.03.003
Maboko, M. & Du Plooy, C. (2009). Effect of plant spacing on growth and yield of lettuce (
Lactuca sativa L.) in a soilless production system.
South African Journal of Plant and Soil,
26, 195-198.
https://doi.org/10.1080/02571862.2009.10639954
Miceli, A. & Miceli, C. (2014). Effect of nitrogen fertilization on the quality of Swiss chard at harvest and during storage as minimally processed produce.
Journal of Food Quality,
37, 125-134.
https://doi.org/10.1111/jfq.12073
Mihai, C., Dorin, S. & Mariana, B. (2015). Influence of phasial fertilization on petioles yield in Swiss chards crop in ecological system. Analele Universității din Oradea, Fascicula: Protecția Mediului, 25, 111-116.
Petropoulos, S., Olympios, C. & Passam, H. (2008). The effect of nitrogen fertilization on plant growth and the nitrate content of leaves and roots of parsley in the Mediterranean region.
Scientia Horticulturae, 118, 255-259
https://doi.org/10.1016/j.scienta.2008.05.038
Rembialkowska, E. (2007). Quality of plant products from organic agriculture.
Journal of the Science of Food and Agriculture,
87, 2757-2762.
https://doi.org/10.1002/jsfa.3000
Riad, G., Ghoname, A., Ahmed, A., El-Baky, M. A. & Hegazi, A. (2009). Cabbage nutritional quality as influenced by planting density and nitrogen fertilization. Fruit, Vegetable and Cereal Science and Biotechnology, 3, 68-74.
Sharma, U., Vihol, N. & Chavda, J. (2013). Influence of plant density and nutrient management on growth, yield and quality of radish (Raphanus sativus L.) cv. 'Pusa Chetki'. Asian Journal of Horticulture, 8, 671-676.
Van Averbeke, W. (2007). Yield response of African leafy vegetables to nitrogen, phosphorus and potassium: The case of Brassica rapa L. subsp. Chinensis and Solanum retroflexum Dun. Water SA, 33.
Van Reeuwijk, L. (2002). Procedures for soil analysis, International Soil Reference and Information Centre. 6th edition. Pp. 101.
Zeka, N., Mero, G., Skenderasi, B. & Gjançi, S. (2014). Effects of nitrogen sources and levels on yield and nutritive values of spinach (Spinacia oleracea L.). Journal of International Academic Research for Multidisciplinary, 2, 327-337.