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Introduction Vegetables, which provide essential nutrients and healthpromoting elements, constantly remain in the area of interest of producers and consumers of so-called "healthy foods". The selection of vegetables cultivated for harvest of fresh material is very wide, and the diversity of products and biological components allows for great potentials of dietary compositions. Pepper (Capsicum sp.) is cultivated in many countries around the world as a precious vegetable with high biological value (Molnár et al., 2005; Wetwitayaklung and Phaechamud, 2011). The field cultivation of sweet pepper for fresh vegetable marketing as well as for processing has gained significant economic importance in Poland in recent years (Gajc-Wolska and Skąpski, 2002; Buczkowska, 2007; Gajc-Wolska et al., 2007). The unique taste quality and health-promoting properties of the fruit, conditioned by the presence of antioxidants and mineral components, contribute to the value of this vegetable in the human diet (Flores et al., 2004; Pokluda, 2004; Zaki et al., 2013). Obtaining a good marketable yield of sweet peppers from open field cultivation in less favorable conditions depends to a large extent on the choice of cultivar and on the application of treatments that enhance the yield (Buczkowska, 2007; Gajc-Wolska et al., 2007), including mineral feeding of plants and the level of feeding (Marín et al., 2009; Kowalska and Sady, 2012; Michałojć and Dzida, 2012). Proper mineral feeding of plants plays an important role in shaping their growth and development, as well as their size and quality of yield. In recent years, calcium has become more popular as its additional function of a secondary information transmitter was discovered. Calcium ion uptake by plants is to a large extent genetically conditioned. The process of Ca absorption, transport, and distribution in a plant is influenced by many soil, biological, and climatic factors (White and Broadley, 2003; Bouzo and Cortez, 2012; Shakoor and Bhat, 2014). Low Ca concentration in plant tissues is the main cause of various physiological disorders. One of the most frequently appearing disorders in pepper feeding in covered cultivation as well as in open fields, which happens in the period of most intense fruit growth, is blossom-end rot (BER), which destroys the usefulness of pepper, tomato, and eggplant fruits (Alexander and

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Leaf beet is one of several types of Beta vulgaris L. The vegetable originates from the Mediterranean area but is currently grown on a large scale in the US and Western Europe, e.g. Switzerland, Germany, France or England. In Poland, it is a less known vegetable, despite its high content of many valuable nutrients and excellent taste. One of the main factors affecting the size and quality of yield is nitrogen fertilization. Nitrogen is a structural element of plants and its deficiency significantly inhibits production of new plant tissue. This element is a component of nucleic acids, nucleotides, coenzymes, chlorophyll, phytohormones and cytokinines. The aim of this study was to conduct research on the effect of varied nitrogen fertilization on yielding and chemical composition of aerial parts of leaf beet. The experiment used three doses of nitrogen (0.2, 0.4, 0.6 g N dm -3 of medium) in the form of ammonium nitrate or urea. Plants were cultivated in a greenhouse, in 4-litre pots filled with highmoor peat limed to pH of 5.6 with waste chalk. The following fertilizers were used in the experiment: ammonium nitrate -34% N, urea -46% N, monobasic potassium phosphate -23% P, 28.2% K, magnesium sulphate -15.6% Mg, and microelements. In the cultivation of leaf beet, application of 0.4 g N dm -3 NH 4 NO 3 proved to be most beneficial as it led to the highest yield of fresh mass of leaves and highest content of L-ascorbic acid, whereas application of CO(NH 2 ) 2 in the amount of 0.2 g N dm -3 of the growth medium proved to be best, as it resulted in the lowest nitrate share in the dry mass of leaves. Regardless of the type of nitrogen fertilization, growth in the total salt concentration (EC) in the medium was shown as an effect of increasing doses of the applied fertilizers. Increasing the nitrogen concentration by 100% in the growth medium in relation to the lowest dose raised the Fe and Cu content in beet leaves and depressed that of Zn and Mn irrespective of the applied nitrogen fertilization. K e y w o r d s : Beta vulgaris L., doses and forms of nitrogen, nitrates, medium, macro-, micronutrients. ODDZIA£YWANIE NAWO¯ENIA AZOTOWEGO NA PLON I WARTOOEAE OD¯YWCZ¥ BURAKA LIOECIOWEGO AbstraktBurak lioeciowy jest jednym z typów uprawnych gatunku Beta vulgaris L. Ojczyzn¹ buraka lioeciowego s¹ kraje le¿¹ce w rejonie Morza OEródziemnego. Obecnie rooelina ta jest warzywem uprawianym na szerok¹ skalê w USA, a tak¿e Europie Zachodniej: Szwajcarii, Niemczech, Francji, Anglii. W Polsce jest warzywem ma³o znanym, mimo ¿e zawiera wiele cennych sk³adników od¿ywczych i smakowych. Jednym z g³ównych czynników wp³ywaj¹cych na wielkooeae i jakooeae plonu jest nawo¿enie azotowe. Azot jest pierwiastkiem budulcowym rooelin, a jego niedobór istotnie ogranicza powstawanie nowych tkanek rooelinnych.Pierwiastek ten wchodzi w sk³ad kwasów nukleinowych, nukleotydów, koenzymów, chlorofilu, fitohormonów, cytokinin. Celem pracy by³o okreoelenie wp³ywu zró¿nicowanego na-wo¿enia azotem na plonowanie oraz sk³ad chemiczny czêoeci nadziemnych buraka lioe...