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. 2006. Nitrate accumulation in different parts of carrot root during vegetation period. Acta Hort. et Regiotecturae 9: 22-24. Lee C. 1986. Changes in carotenoid content of carrots during growth and post-harvest storage. Food Chem. 20(4): 285-293. Mazur Z. 1992. Effect of nitrogen fertilization on the level of nitrate and nitrite contents in vegetables. Biul. Warzywn. XXXVIII: 123-139. Nilsson T. 1987. Growth and chemical composition of carrots as influenced by the time of harvest. J. Agric. Sci. 108: 459-468. Pokluda R. 2006. An assessment of the nutritional

R eferences Berger T. W., Glatzel G. 2001. Response of Quercus petraea seedlings to nitrogen fertilization. Forest Ecology and Management , 149 (1), 1–14. Buraczyk W., Drozdowski S., Szeligowski H., Gawron L., Karpiuk M. 2011. Influence of root system shortening of two-year-old seedlings of Norway spruce ( Picea abies L. Karst.) on their growth after planting (in Polish with English summary). Sylwan , 155 (7), 482–492. Coker A. 1984. Nitrogen status of Pinus radiata seedlings after undercutting: changes in total, soluble, and insoluble nitrogen. New

fertilisation and foliar nutrition regimes on carrot ( Daucus carota L.) yield. Journal of Horticultural Science & Biotechnology 83 (4): 427-434. Smoleń S., Sady W. 2008b. The effect of nitrogen fertilizer form on the content of sixteen elements in red cabbage. Acta Scientiarum Polonorum Hortorum Cultus 7 (1): 35-44. Smoleń S., Sady W. 2009a. The effect of various nitrogen fertilization and foliar nutrition regimes on the concentrations of nitrates, ammonium ions, dry matter and N-total in carrot ( Daucus carota L.) roots. Scientia Horticulturae 119 (3), 219-231. Smoleń S

Biological Value of Red Beets in Relation to Nitrogen Fertilization

Effects of nitrogen fertilizer and fertilization method on biological value of red beet roots (cv. Boro F1) were studied in pot experiments conducted in 2005 and 2006 years. Pre-sowing nitrogen fertilizers were either UAN (urea-ammonium nitrate solution) or ENTEC 26 (nitrogen fertilizer containing nitrification inhibitor). For both fertilizers the following methods of application were studied: pre-sowing superficially 90 kg N·ha-1 (S-100%), pre-sowing superficially 67.5 kg N·ha-1 with additional foliar nitrogen application during vegetation (S-75%+F), pre-sowing localized 67.5 kg N·ha-1 (L-75%) and pre-sowing localized 67.5 kg N·ha-1 with additional foliar nitrogen application during vegetation (L-75%+F). In harvested roots the contents of dry matter, sugars, phenols, NO3 -, NH4 +, N-protein and P, K, Mg and Ca were determined.

Type of nitrogen fertilizer had no effect on dry matter, NH4 +, N-protein, sugars, phenols, Ca and Mg contents in both years and on K in 2005 year. ENTEC 26 reduced nitrates content, particularly in 2005 year. The effect of fertilization method was not univocal, particularly for NO3 - content. In 2005 the lowest NO3 - content was found in treatment S-100% roots, whereas in 2006 in L-75%. In both years the highest sugars content was observed in L-75% roots, and the lowest N-protein in S-100% roots. In both years the method of fertilization had no effect on dry matter, NH4 + and phenols contents. The effect of fertilization method of on mineral composition was apparent only in 2006 year.

It can be concluded that by using the fertilizer with inhibitor of nitrification the biological value of red beets assessed by nitrate content can be improved. The effect of method of fertilizer application on the biological value of red beets is not univocal and may depend on the year of cultivation.

References Chen, B. C., Lai, H. Y., Liu, C. W., Sung, Y. (2014). Effects of nitrogen fertilisers on the growth and nitrate content of lettuce (Lactuca sativa L.). Int. J. Environ Res. Public Health, 11 (4), 4427-4440. Cmelik, Z., Tojnko, S., Unuk, T. (2006). Fruit quality of ‘Fuji’ apple as affected by crop load and rates of nitrogen. Acta Hortic., 721, 147-152. Ernani, P. R., Rogeri, D. A., Proenca, M. M., Dias, J. (2008). Addition of nitrogen had no effect on yield and quality of apples in a high density orchard carrying a dwarf rootstock. Rev. Bras. Frutic

A., 2007. Wpływ zróżnicowanych dawek azotu na plonowanie wartość odżywczą kapusty pekińskiej. Roczn. AR w Poznaniu, Ogrodnictwo 41: 511-515. Krężel J., Kołota E., 2001. Effect of nitrogen fertilizers on yield and biological value of chinese cabbage grown in spring season. Veg. Crops Res. Bull. 55: 91-95. Krężel J., Kołota E., 2008. The effect of nitrogen fertilization on yielding and biological value of Chinese cabbage grown from seedlings for autumn harvest. J. Elementol. 13(2): 255-260. Nowosielski O., 1988. Zasady opracowania zaleceń nawozowych w ogrodnictwie

-azotata sulla produzione del tabacco Burley e mais (Influence of crop system and N-P fertilization on yield of Burley tobacco and maize); Riv. Agron. 34 (2000) 81–91. 5. Ascione, S. and M. Niglio: Missing data estimation in precipitation time series. Giornata di Studio: Metodi Statistici e Matematici per l'Analisi delle serie idrologiche; Rome (2003) 259–270, CNR-GNDCI, no. 2812. 6. Atkinson, W. O., J. L. Ragland, J. L. Sims, and B. J. Bloomfield: Nitrogen composition of Burley tobacco. I. The influence of irrigation on the response of Burley tobacco to nitrogen fertilization

- Perteno kritimo skaièiaus priklausomumas nuo treðimo azoto traðomis ir pjûties laiko [The impact of nitrogen fertilisation and harvest time on Hagberg-Perten falling number of winter wheat] . Þemes Ûkio Mokslai , 14 (2), 11-17 (in Lithuanian). Cesevičienė, J., Leistrumaitë, A., Paplauskienë, V. (2009). Grain yield and quality of winter wheat varieties in organic agriculture. Agron. Res. , 7 (Special issue I), 217-223. Corberllini, M., Canevar, M..G., Mazza, L., Ciaffi, M., Lafiandra, D., Borghi, B. (1997). Effect of the duration and intensity of heat shock during

Agroph. 7: 619-630. Kozik E., 2006. Effect of harvest term and nitrogen and potassium fertilization on the content of nitrates in greenhouse lettuce. Acta Agroph. 7(3): 633-641. Kozik E., Ruprik B., 2000. Chemical composition of lettuce grown in different substrates with increasing nitrogen fertilization. Roczn. AR w Poznaniu CCCXXIII, Ogrodn. 31: 351-355. Linzmeier W., Gutser R., Schmidhalter U., 2001. The new nitrification inhibitor DMPP (ENTEC) allows increased N - efficiency with simplified fertilizing strategies. Plant nutrition - Food security and sustainability

Abstract

An experiment of different application rates of biochar and biochar combined with nitrogen fertiliser was conducted at experimental field on a Haplic Luvisol located in Nitra region of Slovakia during the growing season of spring barley (2014). The aim of this study was to evaluate the effects of biochar and biochar combined with nitrogen fertilisation on the soil organic carbon (SOC). The treatments consisted of 0, 10 and 20 t/ha of biochar application (B0, B10 and B20) combined with 0, 40 and 80 kg/ha N of nitrogen fertiliser applied (N0, N40 and N80). The results showed that SOC content at the beginning and end of the trial was always higher at the plots amended with biochar as compared to control plots (B0N0, B0N40 and B0N80); however, statistically significant effects were observed only at the beginning of the trial as well as at the end of trial in B20N40 treatments. Overall, the highest values of SOC contents were obtained at the beginning as well as at the end of the trial when 10 and 20 t/ha of biochar was applied together with 40 kg/ha N.