The effect of nitrogen fertilisation of grain maize at a very high supply of P, K, Ca and Mg in soil | Efekt dávek dusíku ve výživě zrnové kukuřice při velmi vysoké zásobě P, K, Ca a Mg v půde
2010
Lošák, T., Mendelova zemědělská a lesnická univerzita v Brně, Brno (Czech Republic). Ústav agrochemie, půdoznalství, mikrobiologie a výživy rostlin | Maňásek, J., KWS OSIVA, s.r.o., Velké Meziříčí (Czech Republic) | Hlušek, J., Mendelova zemědělská a lesnická univerzita v Brně, Brno (Czech Republic). Ústav agrochemie, půdoznalství, mikrobiologie a výživy rostlin | Prokeš, K., KWS OSIVA, s.r.o., Velké Meziříčí (Czech Republic) | Filipčík, R., Mendelova zemědělská a lesnická univ., Brno (Czech Republic) | Varga, L., Slovenská poľnohospodárska univ. v Nitre (Slovak Republic). Fakulta agrobiológie a potravinových zdrojov, Katedra agrochémie a výživy rastlín
In two-year small-plot field experiments (in 2008 and 2009) with grain maize (hybrid KWS 2376) we applied urea (non-fertilised control 120-240 kg per ha N). The soil had a very high level of P, K, Ca and Mg and alkali soil reaction. The N content in the biomass in plants in the DC 32 stage (1st node) increased with the rate of N only in 2009; in the DC 61 stage (flowering) it did not change. In 2008 at the highest rate of N the Ca content decreased in the plants of both samplings. The content of N, P, K in grain corresponded with the average values. The lower content of Mg and particularly of Ca in the grain could be due to the antagonistic correlations (Ca2+ - Mg2+; NH4+ - Ca2+; K+ - Ca2+). The nutrient uptake by grain ranged as follows (kg per ha in 2008/2009): 207-238/198-212 (N); 33-37/42-45 (P); 38-46/85-93 (K); 0.13-0.28/0.27-0.70 (Ca); 9.6-11.5/4.3-5.6 (Mg). In the first year the grain moisture at harvest ranged between 28.1-28.9%, while in the second year it markedly dropped to 16.7-17.1% which was influenced by a lower soil moisture content and higher temperature during harvest time. In 2009 only the highest rate of N increased the TSW up to by 8% compared to the two other treatments. The TSW ranged closely between 313.3 and 321.9 g (2008) and 389.3 and 420.5 g (2009). The weather conditions and the rate of N did not affect grain yields which ranged between 13.65 and 14.34 tha and between 13.68 and 14.18 t per ha in 2008 and 2009, respectively.
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