Effect of topdressing with nitrogen and boron on the yield and quality of rapeseed
2010
Varga, L.,Slovenska Polnohospodarska Univ., Nitra (Slovak Republic). Katedra Agrochemie a Vyzivy Rastlin | Lozek, O.,Slovenska Polnohospodarska Univ., Nitra (Slovak Republic). Katedra Agrochemie a Vyzivy Rastlin | Ducsay, L.,Slovenska Polnohospodarska Univ., Nitra (Slovak Republic). Katedra Agrochemie a Vyzivy Rastlin | Kovacik, P.,Slovenska Polnohospodarska Univ., Nitra (Slovak Republic). Katedra Agrochemie a Vyzivy Rastlin | 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
Field trials with winter rape (Brassica napus var. napus, variety Rasmus) were established in August in the years 2002-2004 in order to evaluate the effect of supplementary spring topdressing with nitrogen and boron in the BBCH 29-30 stage. Seed yields and seed qualitative characteristics (TSW, content of oil and crude protein) were followed. We applied DAM-390 (solution of ammonium nitrate and urea, 30% N) at a rate of 30 kg N/ha and Humix Bor (humic acids + N, K, B) at a rate of 0.240 kg B/ha. Different weather conditions in the different years had a significant effect on seed yields as follows: 2003: 1.80-2.29 t/ha; 2004: 2.60-3.35 t/ha; 2005: 2.45-3.29 t/ha. The significant decrease in seed yields in the first year of the experiment was caused namely by the deficit in precipitation in January, February and June 2003 and high temperatures in May and June in the same year. In terms of the individual years and the three-year average the application of Humix Bor itself did not significantly improve seed yield and quality. The application of the N fertiliser alone or in combination with Humix Bor increased seed yields and the crude protein content by 22.4-30.7 % and 4.0-4.9 rel. %, respectively. The significantly highest seed yields (2.98 t/ha) were achieved when the plants were treated with a combination of nitrogen and Humix Bor as compared to all the other treatments (2.28-2.79 t/ha). The oil content in seeds increased significantly to 44.1% only when treated with a combined application of DAM-390 and Humix Bor as against the unfertilised control (42.8%). Fertilisation did not change the TSW which ranged only between 4.47 and 4.67 g.
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