The Effect of Some Agrotechnical Factors on the Herb Yield and Volatile Oil of Dragonhead

Abstract

ABSTRACT The effects of different propagation methods, mulching and nitrogen fertilization on the herb yield and volatile oil content and composition of dragonhead (Dracocephalum moldavica L.) were studied in order to find the optimal cultivation techniques for Finnish conditions. Transplants gave a higher herb yield than sown plants, and an oil richer in geranyl acetate. Mulching had no effect on the volatile oil content or composition. The herb yield was greater in 1987, because of a cold summer. Moderate nitrogen fertilization (<30 kg/ha) significantly increased the herb yield, and higher doses had no further effect.