The winter wheat response to topdressing with nitrogen
Ducsay, L.(Slovak Univ. of Agriculture in Nitra (Slovak Republic). Tr. A. Hlinku 2, 949 76 Nitra, Slovak Republic | Lozek, O. | Varga, L.
Small-plot field experiments were carried out to investigate the effects of additional nitrogen fertilization on the yield of wheat grain and its quality. Winter wheat (Triticum aestivum L.), variety Astella, was used for study. Nitrogenous fertilizers were applied at the 6-leaf growth stage (Zadoks stage 29). The soil was analysed for inorganic nitrogen content up to a 0.6 m depth of the soil profile and nitrogen fertilization rate was computed so as to ensure Nan content of soil at the level of 120 and 140 kg N/ha, respectively. Different weather conditions had a significant influence on grain yield in the experimental years. Nitrogen foliar application has resulted in a highly significant increase in grain yield in all fertilization treatments, ranging from +0.39 to +0.82 t per ha. The average grain yield in the unfertilized control treatment was 6.23 t per ha. Fertilization up to a level of 140 kg N per ha in the soil influenced positively the formation of wet gluten and crude protein, with the highest increase observed in the treatment 5,0+8.9% and +11.0%, respectively, as compared to the control. The average nitrogen rate of 19 kg per ha was found to be the most effective (coefficient of natural effectiveness=30.5), nitrogen being applied in the form of urea solution. This rate ensured a soil nitrogen level of 120 kg per ha.
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