Effect of increasing doses of nitrogen on nutrient uptake by oilseed rape (Brassica napus L.) in years with different weather conditions

Mária Vicianová, Ladislav Ducsay and Peter Hric
Slovak University of Agriculture in Nitra, Faculty of Agrobiology and Food Resources, Institute of Agronomic Sciences, Nitra, Slovakia


Vicianová, M., Ducsay, L. & Hric, P. (2024). Effect of increasing doses of nitrogen on nutrient uptake by oilseed rape (Brassica napus L.) in years with different weather conditions. Bulg. J. Agric. Sci., 30(2), 254–262

The main aim of the experiment was to monitor the effect of increasing nitrogen doses on oilseed rape (Brassica napus L.) macroelements and microelements uptake by primary and secondary harvest product. The plot–scale experiment was set up in years 2013/2014 and 2014/2015 in terms of agricultural cooperative in Mojmírovce in Slovakia. There were five treatments of fertilization and the block method of experimental plot size of 600 m2 in triplicate was used in this experiment. The first treatment was unfertilized control treatment. Other treatments were fertilized by increasing doses of nitrogen 120 kg/ha, 160 kg/ha, 200 kg/ha and 240 kg/ha. Results indicates greatly effect of different weather conditions in experimental years on monitored parameters. There were the highest seeds yield, as well as nutrients uptake found in year 2013/2014 that was warmer and more rich in precipitation than year 2014/2015. The highest average nitrogen uptake by both harvest products 41.06 kg/ha was found at unfertilized control treatment 1. Nutrient uptake ratio of seed and straw at control treatment 1 was N : P : K : Ca : Mg : S = 1 : 0.13 : 0.42 : 0.48 : 0.13 : 0.12. There was found nutrient uptake ratio by both harvest products N : P : K : Ca : Mg : S = 1 :0.14 : 0.61 : 0.37 : 0.12 : 0.11 at treatment 4, where the highest yield of seed was reached. On average, manganese transport was higher than return transport. On the contrary, greater amount of iron was return in the form of straw. Generally, macro and microelements uptake was observed in 2013/2014 with more favourable weather conditions and higher average reached yields. The return transport of elements, especially potassium and calcium, in the form of post-harvest residues is important particularly in conditions without animal production and animal manures.

Keywords: oilseed rape; nitrogen nutrition; nutrients uptake

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