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The nutritional value of some vegetables may greatly vary depending on the cultivation method and kind of fertilization. In 2007–2009 there was conducted a field experiment to evaluate the effects of nitrogen fertilizers (ammonium nitrate, calcium nitrate, ammonium sulphate, urea, Entec-26) and their doses (80, 160 kgN∙ha-1) on yielding and biological quality of two spinach cultivars (Spokane F1, Rembrandt F1) grown for autumn harvest. The use of Entec-26 fertilizer assured the highest mean marketable yield of spinach (12.25 t∙ha-1). Comparable results were observed for ammonium sulphate and ammonium nitrate while lower yield was obtained in treatment supplied with calcium nitrate. The highest accumulation of nitrates and vitamin C was associated with the application of calcium nitrate and the lowest one with ammonium sulphate and Entec-26. An increase of the dose of fertilizer from 80 to 160 kg N∙ha-1 did not significantly affect yielding of spinach and its nutritional value expressed by the content of dry matter, vitamin C and nitrates. Among the two cultivars, Rembrandt F1 produced higher yield of leaves and showed some tendency to a higher accumulation of nitrates, whereas lower content of dry matter and vitamin C. The levels of P, K, Mg and Ca were not dependent on the cultivar as well as kind and dose of nitrogen fertilizer.
Chicory of radicchio type is a vegetable similarly cultivated to head lettuce, yet featuring relatively longer plant growing period. Most of this crop cultivars characterize intensive red color of leaves and white leaves venation. Field experiment carried out in 2005–2007 involved cultivation, from transplants, of radicchio type chicory of ‘Indigo’ cultivar for autumn harvest. Seeds were sown at the end of June and seedlings were transplanted to their final stand in the first week of August. Chicory heads harvesting took place in the half of October and in its course there were estimated the following parameters: total and marketable yield, as well as, in edible parts, the content of .nitrates, macroelements, dry matter, reducing and total sugars and vitamin C. The highest marketable yield of chicory in autumn cultivation was provided by nitrogen fertilization in the dose of 150 kg N∙ha-1 , the whole amount applied once, previously to plant growing period. Intensive nitrogen fertilization contributed to higher amount of accumulated nitrates, potassium, calcium, magnesium, reducing and total sugars, as well as vitamin C.
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