Acta Univ. Agric. Silvic. Mendelianae Brun. 2012, 60(5), 167-172 | DOI: 10.11118/actaun201260050167

The effect of urea and urea with urease inhibitor on the content of macronutrients in tubers and tops of potatoes (Solanum tuberosum L.)

Ludmila Musilová1, Tomáš Lošák1, Jaroslav Hlušek1, Monika Vítězová1, Miroslav Jůzl2, Petr Elzner2, Radek Filipčík3, Miroslav Jůzl4, Eduardo Bennewitz5
1 Ústav agrochemie, půdoznalství, mikrobiologie a výživy rostlin, Mendelova univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika
2 Ústav pěstování, šlechtění rostlin a rostlinolékařství, Mendelova univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika
3 Ústav chovu a šlechtění zvířat, Mendelova univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika
4 Ústav technologie potravin, Mendelova univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika
5 Department of Agronomy, Universidad Católica del Maule, Casilla 7-D, Curicó, Chile

In two-year small-plot field experiments in Žabčice 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 the following: 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 (Urea, Urea + UI) were reflected irregularly in the contents 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 contents of N, K, Ca and Mg were higher in the tops. The P content was balanced both in the tops and tubers. Some changes in the chemical composition were observed particularly in the case of nitrogen. In 2010 the nitrogen content was higher in tubers (1.44-1.65% N) after the application of both of the higher rates of urea + UI than after the application of urea alone (1.30-1.34% N). In 2011 the N content in tops decreased to 2.97-3.26% N when the highest rate of N was applied in both fertilisers, as against the other treatments (3.60-4.09% N). The contents of the other elements (P, K, Ca, Mg) were not significantly affected by the kind fertiliser and way of fertilising or the differences among treatments were minimal. In general we can conclude that after the application of both types of fertilisers the contents of the observed elements did not change fundamentally in the tops or tubers.

Keywords: potatoes, urea, urease inhibitor, macronutrients, tuber, tops
Grants and funding:

This study was supported by Research plan No. MSM 6215648905 called "Biological and technological aspects of the sustainability of controlled ecosystems and their adaptability to climate change" which is financed by the Ministry of Education, Youth and Sports of the Czech Republic and Research project NAZV No. QI101A184 called: Potato Growing Technology - New Environmentally Friendly Approaches.

Received: April 27, 2012; Published: July 30, 2013  Show citation

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Musilová, L., Lošák, T., Hlušek, J., Vítězová, M., Jůzl, M., Elzner, P., ... Bennewitz, E. (2012). The effect of urea and urea with urease inhibitor on the content of macronutrients in tubers and tops of potatoes (Solanum tuberosum L.). Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 60(5), 167-172. doi: 10.11118/actaun201260050167
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