Abstract
Abstract The effects of a mineral fertilization with 150 kg and 300 kg potassium sulphate per hectare and year on the potassium content in the topsoil and subsoil, the potassium content in the leaves and in the must and the generative and vegetative performance of the grape variety 'Grüner Veltliner' were evaluated in a long-term field trial. Soil samplings and soil analyses were carried out in 2009 before fertilization started and in 2016 and 2021. In the topsoil (0 - 25 cm), the potassium contents had increased significantly due to fertilization. In 2021, potassium contents were 19.8 mg, 24.6 mg and 38.1 mg per 100 g of soil, depending on the amount of fertilizer applied. The potassium/magnesium ratio had changed significantly in favour of potassium and the potassium share in the cation exchange capacity had increased significantly. In the subsoil (25 – 50 cm), potassium contents had significantly increased in 2021 only due to fertilization with 300 kg/ha/year. The contents in 2021 were 12 mg, 15 mg and 22 mg per 100 g soil, depending on the amount of fertilizer applied. At the same time, the potassium/magnesium ratio and the potassium share in the cation exchange capacity had also been positively influenced. The potassium content in the vine leaves ranged between 0.91 - 1.50 % depending on the project year and the experimental variant without significant differences between the fertilizer variants in any year. The yield and ripeness parameters, pruning wood weight and the magnesium and nitrogen contents in the must were not statistically significantly influenced by fertilization in any year. In 2020, potassium content in the must was significantly higher in the variant fertilized with 300 kg K 2 SO 4 per hectare and year and tended to be higher in the variant fertilized with 150 kg K 2 SO 4 per hectare and year than in the non-fertilised variant. In the years 2021 and 2022, both fertilized variants showed tendencies towards higher potassium levels in the must. No significant differences were found between the three fertilization variants in the sensory wine evaluation.
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Claims 14
Claim · model-written summary
Fertilization significantly increased topsoil potassium content in the grape vineyard.
- Taxon
- grapee0
- Organ / stage
- topsoile1
- Treatment
- fertilizatione1
- Outcome
- potassium contentse1
- Direction
- increasede1
Not reportedComparator
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e1“In the topsoil (0 - 25 cm), the potassium contents had increased significantly due to fertilization”
Claim · model-written summary
In 2021, topsoil potassium content was 19.8, 24.6 and 38.1 mg per 100 g soil depending on fertilizer amount.
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e2“In 2021, potassium contents were 19.8 mg, 24.6 mg and 38.1 mg per 100 g of soil, depending on the amount of fertilizer applied”
Claim · model-written summary
Fertilization with 300 kg/ha/year significantly increased subsoil potassium content in 2021 only.
- Taxon
- grapee0
- Organ / stage
- subsoile4
- Treatment
- fertilization with 300 kg/ha/yeare4
- Outcome
- potassium contentse4
- Direction
- increasede4
- Qualifier
- in 2021 onlye4
Not reportedComparator
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e4“In the subsoil (25 – 50 cm), potassium contents had significantly increased in 2021 only due to fertilization with 300 kg/ha/year”
Claim · model-written summary
In 2021, subsoil potassium content was 12, 15 and 22 mg per 100 g soil depending on fertilizer amount.
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e4“In the subsoil (25 – 50 cm), potassium contents had significantly increased in 2021 only due to fertilization with 300 kg/ha/year”
e5“The contents in 2021 were 12 mg, 15 mg and 22 mg per 100 g soil, depending on the amount of fertilizer applied”
Claim · model-written summary
The potassium/magnesium ratio in the vineyard soil changed significantly in favour of potassium.
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e3“The potassium/magnesium ratio had changed significantly in favour of potassium and the potassium share in the cation exchange capacity had increased significantly”
Claim · model-written summary
The potassium share in the cation exchange capacity of the vineyard soil increased significantly.
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e3“The potassium/magnesium ratio had changed significantly in favour of potassium and the potassium share in the cation exchange capacity had increased significantly”
Claim · model-written summary
The potassium/magnesium ratio and the potassium share in the cation exchange capacity were positively influenced in the subsoil.
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e6“At the same time, the potassium/magnesium ratio and the potassium share in the cation exchange capacity had also been positively influenced”
Claim · model-written summary
Leaf potassium content of the vines ranged 0.91 to 1.50 % without significant differences between fertilizer variants.
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e7“The potassium content in the vine leaves ranged between 0.91 - 1.50 % depending on the project year and the experimental variant without significant differences between the fertilizer variants in any year”
Claim · model-written summary
Fertilization did not significantly influence yield and ripeness parameters or pruning wood weight in any year.
- Taxon
- grapee0
- Treatment
- fertilizatione1
- Outcome
- yield and ripeness parameters, pruning wood weighte1
- Direction
- not statistically significantly influencede1
- Qualifier
- in any yeare1
Not reportedComparator
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e1“The yield and ripeness parameters, pruning wood weight and the magnesium and nitrogen contents in the must were not statistically significantly influenced by fertilization in any year”
Claim · model-written summary
Fertilization did not significantly influence magnesium and nitrogen contents in the must in any year.
- Taxon
- grapee0
- Treatment
- fertilizatione1
- Outcome
- the magnesium and nitrogen contents in the muste1
- Direction
- not statistically significantly influencede1
- Qualifier
- in any yeare1
Not reportedComparator
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e1“The yield and ripeness parameters, pruning wood weight and the magnesium and nitrogen contents in the must were not statistically significantly influenced by fertilization in any year”
Claim · model-written summary
In 2020, 300 kg K2SO4/ha/year significantly raised potassium content in the must compared with the non-fertilised variant.
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e1“In 2020, potassium content in the must was significantly higher in the variant fertilized with 300 kg K 2 SO 4 per hectare and year and tended to be higher in the variant fertilized with 150 kg K 2 SO 4 per hectare and year than in the non-fertilised variant”
Claim · model-written summary
In 2020, 150 kg K2SO4/ha/year tended to raise potassium content in the must compared with the non-fertilised variant.
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e1“In 2020, potassium content in the must was significantly higher in the variant fertilized with 300 kg K 2 SO 4 per hectare and year and tended to be higher in the variant fertilized with 150 kg K 2 SO 4 per hectare and year than in the non-fertilised variant”
Claim · model-written summary
In 2021 and 2022, both fertilized variants tended towards higher potassium levels in the must.
- Taxon
- grapee0
- Treatment
- fertilized variantse1
- Outcome
- potassium levels in the muste1
- Direction
- tendencies towards highere1
- Qualifier
- In the years 2021 and 2022e1
Not reportedComparator
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e1“In the years 2021 and 2022, both fertilized variants showed tendencies towards higher potassium levels in the must”
Claim · model-written summary
No significant differences were found between the three fertilization variants in sensory wine evaluation.
Not reportedComparatorDirection
Verbatim
e0“the grape variety 'Grüner Veltliner'”
e1“No significant differences were found between the three fertilization variants in the sensory wine evaluation”
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See all 47 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.