STRAIN PRODUCTION IN INDUSTRIAL HEMP GENOTYPES – COMPARATIVE ANALYSIS

The study evaluated the stem production of ten fiber hemp genotypes. The research was conducted within the ARDS Lovrin. The field experiments were located on a chernozem soil, of medium fertility. The fiber hemp genotypes were designated with numerical codes, 721 to 730. Each genotype was cultivated in replicates. The comparative crop was under non-irrigated conditions. The plants samples were harvested within each variant, and according to the experimental protocol they were left to dry on the ground for a few days, placed "in scissors". After drying and shaking off the leaves, the stems were weighed. The stem yield (Y) varied between Y = 8800±260.58 kg ha-1 (genotype 724) and Y = 11236±260.58 kg ha-1 (genotype 728). The analysis of the results was done in relation to genotype 721 (control), as well as in relation to the mean value of the experiment (Y_m). Compared to the control variant (genotype 721, Y = 9840.00±260.58 kg ha-1), genotype 728 (***), genotype 730 (**) and genotype 722 (*) showed positive differences, according to LSD. Compared to the mean of the experiment (Y_m = 9861.40 kg ha-1) genotype 728 showed positive differences at the p<0.001 level (***), and genotypes 722 and 730 at the p<0.01 level (**). The yield increase for stem production, compared to the mean value of the experiment, was at the level of DY = 960.60 kg ha-1 (genotype 722), DY = 983.60 kg ha-1 (genotype 730), and DY = 1374.6 kg ha-1 (genotype 728), respectively. Cluster analysis facilitated the grouping of genotypes based on Euclidean distances (Coph.corr. = 0.910). The recorded results highlighted genotypes with advantages in stem production, important for the hemp fiber breeding program.