In 2008, a series of experiments were performed at the Institute of Ornamental Plants?￠????Sofia in greenhouse conditions that tested the influence of salt stress on species of annual plants?￠????Tagetes patula and Ageratum mexicanum. The plants were cultivated in pots under normal soil conditions and salt stress was induced by adding solutions with different concentrations of NaCl (0.4%, 1.2% and 2.0%). The following results were obtained: ?￠???￠ The suppression of plant growth increases with the increase of NaCl concentration. ?￠???￠ The plants, treated with NaCl, have earlier and shorter blooming period than non-treated plants.
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