The experiments on celery, curly kale and lettuce reported in this paper were carried out
in a greenhouse, with plants grown in 2 dm3 pots filled with peat substrate. The trials were established
in a completely randomized design. The aim was to determine the effect of increasing
nitrogen doses (0.3, 0.6, 0.9, 1.2 g N dm-3 of substrate) on N-tot., NO3-N, concentrations of P, K,
Ca, Mg, Fe, Zn, Mn and Cu as well as ratios between these elements in three vegetable species
such as curly kale, lettuce, and celery, distinguished by different degrees of sensitivity to salinity.
An increase in the content of total nitrogen and NO3-N in lettuce, curly kale and celery appeared
to be parallel to the increasing doses of nitrogen, while the average total nitrogen content
was similar in all the tested species, and the content of N-NO3 in kale was about five-fold
lower than in lettuce and celery. The level of nitrogen fertilization influenced the content of potassium
and magnesium in lettuce as well as the content of phosphorus, potassium, calcium and
magnesium in celery. The nitrogen doses significantly differentiated proportions between the
nutrients in plants, mostly the K:Mg and Zn:Cu ratios. The increasing doses of nitrogen modified
the content of microelements and proportions between various components in the tested
plant species.
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