[Effect of interaction between hemp (Cannabis sativa) varieties and agrotechnical practices on the production of usable biomass and tetrahydrocannabinol concentration]
2002
Manhalterova, M. | Kocourkova, B. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Pestovani a Slechteni Rostlin)
The aim of the experiments was to find optimal varieties and culture conditions for hemp production in the Czech Republic. Six hemp varieties (Juso 11, Beniko B, Bialobrzeskie, Silesia, Tardif, and Early) were grown in randomized plots between 1996 and 1999. The sowing rates tested were 1, 2, and 3,5 million of germinating seeds (MGS) per hectare, fertilising rates 80 and 20 kg of nitrogen per hectare. Plants were sampled from flowering to full maturity in order to evaluate concentrations of tetrahydrocannabinol (THC) in flowers and leaves, height of plants, number and weight of leaves per plant, fresh weight of stems, length, weight, and dry matter concentration of inflorescence. The studied morphological and mass parameters varied according to the variety, year, sowing, and fertilising rates. Several interactions between the factors were observed. THC concentrations depended mainly on the variety, sowing rate, and year. They were nevertheless always below the approved limit of Czech and UE standards (0.3 %). In 1999, two of the tested varieties, Juso 11 and Beniko B, were registered in the Czech Republic.
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