The effectiveness of mineral fertilization can be improved through starter or band application. This technique reduces fertilizer doses (costs) and minimizes environmental risks. This paper presents the results of a 3-year study investigating the effects of a micro-granular starter fertilizer (MSF) applied in the seed zone on the micronutrient content and micronutrient uptake by the biomass of winter oilseed rape (Brassica napus L.) during the autumnal growth and after harvest. The study was carried out at the Agricultural Experiment Station in Bałcyny (NE Poland) in 2012–2015. During the autumnal growth, micronutrient concentrations (in particular Mn and Fe) were higher in the roots than in the leaf rosettes of winter oilseed rape. The application of the MSF in autumn increased the content of Cu, Zn and Fe but decreased Mn levels in rosettes. The application of the MSF during sowing increased the concentrations of Zn, Mn and Fe in roots. During the autumnal growth, the micronutrient uptake was estimated at 481.0 g Fe ha-1, 81.8 g Mn ha-1, 56.5 g Zn ha-1 and 7.7 g ha-1 Cu. The MSF improved the micronutrient uptake by winter oilseed rape in autumn. In post-harvest biomass, the highest Fe and Mn content was determined in roots, and the highest Cu and Zn concentrations were detected in seeds. The MSF increased the micronutrient content of seeds (Cu, Mn and Fe) and straw (Cu, Zn, Mn and Fe). In treatments where the NPK fertilizer was applied before sowing (at the standard or half the standard dose), the application of the MSF during sowing decreased Cu and Mn concentrations and increased the Zn and Fe content of post-harvest residues (roots). Micronutrient (Cu, Zn, Mn, Fe) uptake by seeds and straw was significantly higher under the influence of the MSF. The application of the MSF in autumn decreased the micronutrient uptake by the winter oilseed rape roots.  

24.2.2019