The effect of urea and urea with urease inhibitor on the content of macronutrients in tubers and tops of potatoes (Solanum tuberosum L.)
Musilova, L., Mendelova Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin | Losak, T., Mendelova Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin | Hlusek, J., Mendelova Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin | Vitezova, M., Mendelova Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin | Juzl, M., Mendelova Univ., Brno (Czech Republic). Ustav Pestovani, Slechteni Rostlin a Rostlinolekarstvi | Elzner, P., Mendelova Univ., Brno (Czech Republic). Ustav Pestovani, Slechteni Rostlin a Rostlinolekarstvi | Filipcik, R., Mendelova Univ., Brno (Czech Republic). Ustav Chovu a Slechteni Zvirat | Juzl, M., Mendelova Univ., Brno (Czech Republic). Ustav Technologie Potravin | Bennewitz, E., Universidad Catolica del Maule, Curico (Chile). Dept. of Agronomy
In two-year small-plot field experiments in Zabcice u Brna we explored the effect of nitrogen fertilisation with urea and urea with urease inhibitor (Urea + UI) on the content of macronutrients (N, P, K, Ca, Mg) in tubers and tops of potatoes of the variety Karin. The experiment involved 7 treatments. Nitrogen rates in treatments 1-7 were as follows: 1) 90 kg N/ha - Urea; 2) 72 kg N/ha - Urea; 3) 54 kg N/ha - Urea; 4) 90 kg N/ha - Urea + UI; 5) 72 kg N/ha - Urea + UI; 6) 54 kg N/ha - Urea + UI; 7) unfertilised control. Each treatment was repeated 4 times. Both fertilisers were reflected irregularly in the levels of N, P, K, Ca, Mg in the potato biomass and were based on the weather of the year, rate of fertiliser and analysed plant organ (tuber, top). In both years the levels of N, K, Ca and Mg were higher in the tops than in the tubers. The P concentration was balanced both in the tops and tubers. Some changes in the chemical composition were observed particularly in the case of N. In 2010 N concentrations were higher in tubers after the application of high rates of urea + UI than after the application of urea alone (1.44-1.65% N vs. 1.30-1.34% N). In 2011 N concentration in tops decreased to 2.97-3.26% when the highest rate of N was applied in both fertilisers. When using the other treatments, N concentrations varied between 3.60% and 4.09%. The concentrations of the other elements were not significantly affected by the kind of fertiliser and way of fertilising. We can conclude that after the application of both types of fertilisers the levels of the observed elements did not change fundamentally in potato tops or tubers.
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