Coriander seeds were matriconditioned with MicroCel-E and osmoconditioned in PEG solution and then treated or not treated with fungicide. The microbiological infestation of conditioned and control seeds were on a similar level. Both tested conditioning methods increased significantly the seed and seedling vigour, whereas fungicide application had no effect. The only significant differences between matriconditioning and osmoconditioning were found in leaf DNA content. The advantageous effect of presowing conditioning was proved also with respect to coriander seed yield, oil content, and oil yield. Depending on the location of field experiments, the coriander crop from osmoconditioned and matriconditioned seeds responded in a different pattern of yielding. The same concerned the fungicide application. The tested methods of presowing treatments did not change the quality and quantity composition of coriander oil significantly.

Marjoram seeds were soaked in Gibrescol solution (GA 3), matriconditioned with MicroCel-E (MCE), and osmoconditioned in polyethylene glycol solution (PEG). The treated seeds and control ones were either dressed with fungicide or sown without it. In order to investigate the effect of the applied treatments on the marjoram herb yield, content and composition of essential oil and oil yield, field experiments were conducted in two regions of Poland (Warsaw and Krakow). Transplants were grown in the greenhouse. Each tested method of presowing treatment increased the seed vigour and the highest improvement was noted with MCE and followed by PEG and GA 3 , respectively. Fungicide application did not cause positive effects. That was also confirmed with the results of field experiments where fungicide applying either showed no significant differences (Krakow) or even decreased the yield of marjoram herb and oil (Warsaw). The advantageous effect of presowing seed conditioning and treating with GA 3 on the marjoram yield was observed in both experimental locations, eventhough its degree was different. Tested methods of seed treatment did not change marjoram oil composition considerably.