Abstract
The effects of P and K on grapevines (Vitis vinifera L.) var. Muscat Rosada were evaluated four years, considering the same levels of N. The experiment was conducted at the Vicua Experimental Station (30 S; 7044 W) of the Instituto de Investigaciones Agropecuarias (INIA). The soil is alluvial antropic miscellaneous (Entisols). Three fertilization treatments were established: 1) N 160 + P 2 O 5 200 + K 2 O 300; 2) N 160 + P 2 O 5 0 + K 2 O 300; and 3) N 160 + P 2 O 5 200 + K 2 O 0. At the beginning of the experiment, grape vines received all the phosphate fertilizers, 200 kg ha -1 of P 2 O 5 as triple superphosphate in Treatments 1 and 3. Nitrogen was applied as urea for four years. The applications were initiated when the vine buds measured 20 cm. The K was applied to the soils of Treatments 1 and 2, at a dosage of 200 kg ha -1 K 2 O, using potassium sulphate. Between berry set and 30 d before harvest, 100 kg ha -1 K 2 O were applied as potassium sulphate by fertigation. Significant effects of the P fertilization were observed by the second year, with increased cluster numbers per plant. K also increased grape fruit yield by the third year. This response was obtained with less than 5 mg kg -1 of P available in the soil and less than 145 mg kg -1 of exchangeable K in the soil. The initially low content of available K and P suggests a high probability of response to the application of both elements.
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Claims 4
Claim · model-written summary
P fertilization significantly increased the number of clusters per grapevine by the second year.
- Taxon
- Grapet0
- Treatment
- P fertilizatione1
- Outcome
- cluster numbers per plante1
- Direction
- increasede1
- Qualifier
- by the second yeare1
Not reportedComparator
Verbatim
t0“Grape”
e1“Significant effects of the P fertilization were observed by the second year, with increased cluster numbers per plant”
Claim · model-written summary
K fertilization increased grape fruit yield by the third year.
Not reportedComparator
Verbatim
e1“K also increased grape fruit yield by the third year”
Claim · model-written summary
The fertilization response was obtained at soil available P below 5 mg kg-1 and exchangeable K below 145 mg kg-1.
Verbatim
t0“Grape”
e1“This response was obtained with less than 5 mg kg -1 of P available in the soil and less than 145 mg kg -1 of exchangeable K in the soil”
Claim · model-written summary
The authors suggest that the initially low available K and P imply a high probability of response to applying both elements.
Verbatim
t0“Grape”
e1“The initially low content of available K and P suggests a high probability of response to the application of both elements”
The same questions in other papers
potassium · yield · VitisResults differ
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- no effect
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44 papers in the same direction as this paper · 7 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
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See all 53 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.