Abstract
Potassium concentration in grape berries can affect acidity and pH in must and wines. Under the current warming scenario, where preserving equilibrated value for these grape parameters is increasingly challenging, K fertilization could represent a tool to manage grape composition. In this study, the effect of potassium fertilization was investigated over 4 years (2013–2016) in field-grown grapevines (Vitis vinifera cv. Glera). Four different potassium rates (0, 15, 30, 60 kg K2O ha−1 year−1) were tested and agronomic responses, grape quality as well as K concentration in the berry were recorded over the four years. At harvest, yield parameters and total soluble solids were unaffected by potassium fertilization. On the contrary, the titratable acidity of the musts was increased by the higher rate of potassium (K60), and both tartaric and malic acids showed higher values when the K rate was higher. K fertilization did not affect the pH, as all the treatments displayed comparable pH values and in an optimal range for winemaking. Overall, in our experimental conditions, medium potassium inputs showed better results on Glera grape quality compared to low K rates, by promoting higher titratable acidity levels without altering the pH in musts.
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Claims 5
Claim · model-written summary
Potassium fertilization did not affect yield parameters or soluble solids.
- Taxon
- Glera Grapevine (Vitis vinifera L.)
Vitis viniferat0 - Treatment
- potassium fertilizatione0
- Outcome
- yield parameters and total soluble solidse0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glera Grapevine (Vitis vinifera L.)”
e0“yield parameters and total soluble solids were unaffected by potassium fertilization”
Claim · model-written summary
The highest K rate increased must titratable acidity.
- Taxon
- Glera Grapevine (Vitis vinifera L.)Vitis viniferat0
- Treatment
- higher rate of potassium (K60)e0
- Outcome
- titratable acidity of the mustse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glera Grapevine (Vitis vinifera L.)”
e0“titratable acidity of the musts was increased by the higher rate of potassium (K60)”
Claim · model-written summary
Higher K rates increased tartaric and malic acids.
- Taxon
- Glera Grapevine (Vitis vinifera L.)Vitis viniferat0
- Treatment
- K ratee0
- Outcome
- tartaric and malic acidse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glera Grapevine (Vitis vinifera L.)”
e0“both tartaric and malic acids showed higher values when the K rate was higher”
Claim · model-written summary
Potassium fertilization did not change must pH.
- Taxon
- Glera Grapevine (Vitis vinifera L.)Vitis viniferat0
- Treatment
- K fertilizatione0
- Outcome
- pHe0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glera Grapevine (Vitis vinifera L.)”
e0“K fertilization did not affect the pH, as all the treatments displayed comparable pH values”
Claim · model-written summary
Medium K inputs gave better grape quality than low K rates, raising acidity without changing must pH.
- Taxon
- Glera Grapevine (Vitis vinifera L.)Vitis viniferat0
- Outcome
- medium potassium inputs showed better results on Glera grape qualitye0
- Comparator
- low K ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glera Grapevine (Vitis vinifera L.)”
e0“medium potassium inputs showed better results on Glera grape quality compared to low K rates, by promoting higher titratable acidity levels without altering the pH in musts”
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