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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.
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- Perteno kritimo skaièiaus priklausomumas nuo treðimo azoto traðomis ir pjûties laiko [The impact of nitrogenfertilisation 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
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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.