Abstract
ABSTRACT Zweigelt grapes have recently become susceptible to infestation with Traubenwelke (grape wilting) and the susceptibility has been assumed to be related to potassium (K) deficiency. The aim of the studies was to determine the effects of foliar application of K on leaf K content, leaf gas exchange, and on infestation of grapes with Traubenwelke. Three foliar fertilizers of K (Agripotash, 27.4% K; Nutrileaf, 33.2% K; and KNO3, 38.7% K) and one of magnesium (Mg) (Agrovit Mg, 4.8% Mg) were tested on grapevines (Vitis vinifera, L. cv. ‘Zweigelt’) in field studies in 2003 and 2004. Foliar analysis showed that the tested foliar fertilizers had no effect on leaf K content in either year. Furthermore, the frequency of infestation with grape wilting was not reduced by K fertilizers. Measurements of leaf gas exchange in 2004 showed that all fertilizer treatments reduced photosynthesis (A) and stomatal conductance (gs) compared with the untreated control.
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Claims 3
Claim · model-written summary
Foliar K fertilizers had no effect on leaf K content in either year.
- Taxon
- Vitis vinifera
Vitis viniferae0 - Material
- Zweigeltt0
- Treatment
- Three foliar fertilizers of Ke0
- Outcome
- leaf K contente1
- Direction
- no effecte1
- Qualifier
- in either yeare1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Zweigelt Grapevine to Foliar Application of Potassium Fertilizer: Effects on Gas Exchange, Leaf Potassium Content, and Incidence of Traubenwelke”
e0“Three foliar fertilizers of K (Agripotash, 27.4% K; Nutrileaf, 33.2% K; and KNO3, 38.7% K) and one of magnesium (Mg) (Agrovit Mg, 4.8% Mg) were tested on grapevines (Vitis vinifera, L. cv.”
e1“Foliar analysis showed that the tested foliar fertilizers had no effect on leaf K content in either year”
Claim · model-written summary
K fertilizers did not reduce the frequency of grape wilting infestation.
- Taxon
- Vitis viniferaVitis viniferae0
- Material
- Zweigeltt0
- Treatment
- K fertilizerse2
- Outcome
- frequency of infestation with grape wiltinge2
- Direction
- not reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Zweigelt Grapevine to Foliar Application of Potassium Fertilizer: Effects on Gas Exchange, Leaf Potassium Content, and Incidence of Traubenwelke”
e0“Three foliar fertilizers of K (Agripotash, 27.4% K; Nutrileaf, 33.2% K; and KNO3, 38.7% K) and one of magnesium (Mg) (Agrovit Mg, 4.8% Mg) were tested on grapevines (Vitis vinifera, L. cv.”
e2“Furthermore, the frequency of infestation with grape wilting was not reduced by K fertilizers”
Claim · model-written summary
All fertilizer treatments reduced photosynthesis and stomatal conductance compared with the untreated control in 2004.
- Taxon
- Vitis viniferaVitis viniferae0
- Material
- Zweigeltt0
- Treatment
- all fertilizer treatmentse3
- Outcome
- photosynthesis (A) and stomatal conductance (gs)e3
- Direction
- reducede3
- Qualifier
- in 2004e3
- Comparator
- untreated controle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Response of Zweigelt Grapevine to Foliar Application of Potassium Fertilizer: Effects on Gas Exchange, Leaf Potassium Content, and Incidence of Traubenwelke”
e0“Three foliar fertilizers of K (Agripotash, 27.4% K; Nutrileaf, 33.2% K; and KNO3, 38.7% K) and one of magnesium (Mg) (Agrovit Mg, 4.8% Mg) were tested on grapevines (Vitis vinifera, L. cv.”
e3“Measurements of leaf gas exchange in 2004 showed that all fertilizer treatments reduced photosynthesis (A) and stomatal conductance (gs) compared with the untreated control”
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