The amount of main cannabinoid substances in hemp, cultivated for industrial fibre production and their changes in the course of one vegetation period.

The presented study followed the quantitative amount of main cannabinoid substances in Czechoslovak hemp, variety Rastislavice, cultivated for industrial fibre production, in the course of the vegetation period of the year 1985. The hemp samples were collected for analysis in 17 various vegetation stages of the plant growth and they were treated both in fresh and dried state. The analyses were performed in samples of sexually undistinguished plants (7 vegetation stages), in samples of male plants (3 vegetation stages) and in samples of female plants (10 vegetation stages). The experiment resulted in the most complete study of the Czechoslovak variety of hemp from the point of view of extractibility of substances, as well as of the amount of CBD and delta 9-THC.