Abstract
The early black cultivar Ronelle is the major export table grape produced in the northern summer rainfall area of South Arica. In a rootstock trial at Roodeplaat near Pretoria, low yield, poor quality and low export mass as well as typical potassium (K) deficiency symptoms were observed for Ronelle grafted onto 110 Richter, despite K saturation percentages of 6,3% and 6,0% in the topsoil and subsoil respectively. The effect of 500 kg ha-1 and 1 000 kg ha-1 soil-applied K combined with a 0,02% foliar application of K was investigated for Ronelle grafted onto 110 R (V. rupestris x V. Berlandieri), 101-14 Mgt (Y. riparia x V. rupestris) and 143 B Mgt (v. riparia x V. vinifera). The K fertilizer treatments were applied only once, before budbreak. Three foliar sprays were applied annually, at two-week intervals, commencing at 15 cm shoot length. Results after two seasons showed that neither high levels of K fertilizer, nor K foliar sprays improved yield or quality of Ronelle on 110 R. The K content of leaves was not significantly affected by any of the K treatments. Leaf K levels of 110 R were significantly lower compared to those of 143 Mgt, but the leaf K content of all three graft combinations was above the minimum norm. Apparently there is no effective cure for established Ronelle/110 R vineyards with K deficiency problems and it is recommended that the Ronelle/110 R graft combination is not used in future.
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Claims 7
Claim · model-written summary
Ronelle on 110 Richter showed low yield, poor quality, low export mass and potassium deficiency symptoms.
- Taxon
- Vitis vinifera L.
Vitis viniferat0 - Material
- Ronellee0
- Outcome
- low yield, poor quality and low export masse0
- Qualifier
- potassium (K) deficiency symptomse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low yield, poor quality and low export mass as well as typical potassium (K) deficiency symptoms were observed for Ronelle grafted onto 110 Richter”
t0“Vitis vinifera L. cv. Ronelle”
Claim · model-written summary
High soil potassium did not improve yield or quality for Ronelle on 110 R.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Material
- Ronelle on 110 Re0
- Treatment
- high levels of K fertilizere0
- Outcome
- yield or qualitye0
- Direction
- neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“neither high levels of K fertilizer, nor K foliar sprays improved yield or quality of Ronelle on 110 R”
t0“Vitis vinifera L. cv. Ronelle”
Claim · model-written summary
Potassium foliar sprays did not improve yield or quality for Ronelle on 110 R.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Material
- Ronelle on 110 Re0
- Treatment
- K foliar sprayse0
- Outcome
- yield or qualitye0
- Direction
- neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“neither high levels of K fertilizer, nor K foliar sprays improved yield or quality of Ronelle on 110 R”
t0“Vitis vinifera L. cv. Ronelle”
Claim · model-written summary
Potassium treatments did not significantly change leaf potassium content.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Treatment
- K treatmentse0
- Outcome
- K content of leavese0
- Direction
- not significantly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The K content of leaves was not significantly affected by any of the K treatments”
t0“Vitis vinifera L. cv. Ronelle”
Claim · model-written summary
Leaf potassium in 110 R was significantly lower than in 143 Mgt.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Material
- 110 Re0
- Outcome
- Leaf K levelse0
- Direction
- lowere0
- Comparator
- 143 Mgte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf K levels of 110 R were significantly lower compared to those of 143 Mgt”
t0“Vitis vinifera L. cv. Ronelle”
Claim · model-written summary
Leaf potassium of all three graft combinations exceeded the minimum norm.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Outcome
- leaf K contente0
- Direction
- abovee0
- Comparator
- minimum norme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf K content of all three graft combinations was above the minimum norm”
t0“Vitis vinifera L. cv. Ronelle”
Claim · model-written summary
The authors recommend against future use of the Ronelle/110 R combination.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Outcome
- Ronelle/110 R graft combination is not used in futuree0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it is recommended that the Ronelle/110 R graft combination is not used in future”
t0“Vitis vinifera L. cv. Ronelle”
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See all 13 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.