The Influence of Agricultural Sulphur on the Flavour of Horticultural Crops
Plants mainly absorb sulphur in the form of sulphate (SO₄²⁻), which is then converted into amino acids such as cysteine and methionine.
Sulphur Metabolism in Plants
Plants mainly absorb sulphur in the form of sulphate (SO₄²⁻), which is then converted into amino acids such as cysteine and methionine. These are precursors of volatile compounds responsible for characteristic flavours and aromas in many vegetables.
Alliums: Garlic and Onion
In garlic and onion, sulphur is part of thiols and sulfoxides which, when broken down during cutting or cooking, release substances such as allicin, responsible for their intense flavour and aroma.
A good sulphur supply:
- Intensifies desirable volatile compounds.
- Improves the sensory profile.
- Increases pungency and aromatic intensity.
Cruciferous Crops: Broccoli, Radish, Cabbage…
Brassicaceae are particularly rich in glucosinolates, which break down to produce isothiocyanates and other compounds responsible for bitter, spicy or sulphurous flavours.
Sulphur promotes:
- The synthesis of glucosinolates.
- The intensity of characteristic flavours.
- The formation of bioactive compounds such as sulforaphane in broccoli.
Tomato and Pepper
Sulphur contributes to the production of glutathione, polyphenols and flavonoids, which affect aroma, colour and texture.
With an adequate sulphur supply:
- Tomatoes better retain their fresh aromatic profile.
- Peppers develop greater flavour intensity.
Other Horticultural Crops
- Cucurbits: balance bitterness and improve the sensory profile.
- Carrot: enhances compounds that bring out sweetness and aroma.
- Lettuce: reduces bitterness and provides freshness.
Sulphur is not only essential for plant growth, but also for improving the sensory quality of horticultural crops. Adjusting sulphur fertilisation means enhancing flavours, aromas and the commercial value of the harvest.
In this context, AFEPASA promotes the innovative Sultech® technology, which optimises the availability and effectiveness of agricultural sulphur. With Sultech®, farmers can obtain healthier crops with a superior organoleptic profile, combining productivity, sustainability and market differentiation.