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Influence of humic and fulvic acids in the initial growth of hemp plant (Cannabis sativa L.)
Abstract
Hemp seed (Cannabis sativa L.) were treated with humic substances obtained from various soil substrates. Aqueous solutions (200 mg / l) of humic acids (4 types) and one fulvic acid were used. The germination test was performed on Petri dishes under laboratory condition. The results obtained have to be critically analyzed with respect to the potassium content in the humic substances. Perspective results were monitored in seeds reactions to fulvic acid isolated from the O1 horizon (Březník, Šumava) and to humic acid isolated from lignite (Mikulčice).
... Biologically active compounds in HSs are connected with original soil organic matter (Antošová et al. 2007). It is possible to point out the seed germination of hemp (Cannabis sativa), which showed a positive trend after the use of HA obtained from lignite, and the initial growth of the seedling after the use of FA (Šerá and Novák 2019). It seems important to know whether HSs affect plants in the same way. ...
Stimulatory effect of humic and fulvic acids (humic substances) extracted from local sources of lignite and soils on germination and early growth of hemp (Cannabis sativa L.), poppy (Papaver somniferum L.), pepper (Capsicum annuum L.) and rape (Brassica napus subsp. napus) were verified. The following structural parameters were determined for humic substances: aromaticity, biological activity, and hydrophilicity/hydrophobicity ratio. Germination rate, weight of seedling, accretion of seedling, and seedling vitality were determined in a growth test in laboratory conditions. It was found that the type of plant together with the type of humic and fulvic acids was of great importance for germination and initial growth (two-way ANOVA). The reaction of the monitored plant species was different to the types of humic and fulvic acids. A positive effect on germination and initial growth was observed in poppies (compared to controls, p < 0.05); in other species, no significant statistical responses were observed. The tested plants can be sorted according to the descending significant positive effect on the weight of seedling as follows: poppy, pepper, rape, hemp. We found that structural parameters of humic and fulvic acids correlated with many measured parameters of germination and early growth (p < 0.05). The results show that the origin of humic substances and their structural properties can significantly affect the germination of seeds and their initial growth. In addition, the responses of taxonomically different plant species after treatment with humic acids can be fundamentally different.
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