The effect of soil fertilization on the formation and the amount of cannabinoid substances in Cannabis sativa L. in the course of one vegetation period.

The study followed the effect of the soil fertilization on the growth of plants and on the formation and the amount of extractible substances as well that of two main cannbinoid substances (CBD, delta-9-THC) in the Czechoslovak variety of hemp, Rastislavice, cultivated in Czechoslovakia for fibre production in the course of the vegetation period of 1988. In fourteen various vegetation stages of the plant growth, the samples of the plant tops, cultivated on five fields with different soil fertilization, were collected and analyzed in the dried state.