article · Plants
Soil and climate characteristics significantly influence saffron quality, which is determined by its secondary metabolite profile. Saffron samples were evaluated using high-performance liquid chromatography with diode array detection, while corresponding soil samples were examined through physicochemical testing, ED-XRF fluorescence, and X-ray diffraction to identify clay types. The findings show that saffron grown in loam-clay-sand soils developed high levels of crocins and kaempferol 3-sophoroside 7-glucoside, but lower levels of safranal. Similarly, soils rich in organic matter, phosphorus, and potassium produced saffron with elevated crocins and kaempferol 3-sophoroside 7-glucoside alongside reduced safranal. Furthermore, the mineral analysis revealed that clays containing low concentrations of iron can exert a positive effect on the overall colouring strength of saffron.
Saffron quality and market value rely on specific secondary metabolites that govern its colouring and aromatic properties. Understanding how specific soil nutrients, textures, and clay types alter these chemical compounds provides valuable insights for producers seeking optimal growing environments to naturally enhance the desired chemical traits of saffron crops.
This early-stage research could inform saffron growers, agronomists, and soil testing services looking to select optimal cultivation sites or tailor soil management for high-potency saffron. Because the abstract details an analytical and observational study rather than field trial interventions or commercial protocols, further applied development is necessary before translation into practical soil amendment programmes.
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Climate and soil are important factors that affect the quality of saffron. Saffron quality is determined by the marked content of secondary metabolites. The objective of this work was to study the effect of soil physicochemical properties on the secondary metabolites of saffron. Our study concerned the analysis of saffron samples by high-performance liquid chromatography-detection by diode array (HPLC-DAD). Soil samples were analyzed by physicochemical methods, ED-XRF fluorescence and X-ray diffraction to determine the different types of clays. Saffron samples grown in loam-clay-sand soils contained high values of crocins and kaempferol 3-sophoroside 7-glucoside but low values of safranal. In addition, saffron samples grown in soils rich in organic matter, phosphorus and potassium contained high values of crocins and kaempferol 3-sophoroside 7-glucoside but low values of safranal. This original approach was carried out for the first time in our study, both by ED-XRF fluorescence and by X-ray diffraction, to determine what elements affect the quality of saffron. Thus, we concluded that clays containing low amounts of iron could have a positive effect on the coloring strength of saffron.
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DOI: 10.3390/plants12040711
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