The effect of selected foliar fertilizers and bio-growth regulators on the yield and quality of sweet marjoram (Origanum majorana L.) herbs

Abstract

In the years 2013–2014 in Trębanów a field experiment was conducted on clay soil of
loess origin. The aim of the experiment was to determine the influence of six foliage fertilizers:
Plonvit Kali (6 kg·ha-1), Bormax (2 l·ha-1), Calio (1.5 l·ha-1), Tytanit (0.8 l·ha-1), Asahi SL (0.1%),
Fertileader Vital (5 l·ha-1) on the yield and quality of the raw material of marjoram (Origanum
majorana L.) of 'Miraż' cultivar. All the applied preparations contributed to the increase of the
height of the plants and consequently to the increase of the yield of the herb. However, only
preparations Bormax and Plonvit Kali increased the content of essential oil in herb, resulting in an
increased yield of essential oil. For other preparations a decrease in the essential oil content in the
herb and a reduced yield of essential oil (Fertileader Vital i Asahi SL) were found, or no
significant effect of this feature (Calio and Tytanit).