Abstract
‘Vidalia’ onions are sweet, short day, low pungency, yellow Granex-type bulbs that are popular in the United States. The relationships of sweet onion bulb yield and quality with potassium (K) and sulfur (S) concentrations are not fully understood. The objective of this study was to evaluate the effects of K and S fertilization rates on sweet onion plant growth and bulb yield and quality. Experiments were conducted at the Horticulture Farm, Tifton Campus, University of Georgia, in the Winters of 2012–13 and 2013–14. The experiment had five treatments (K/S rates: 56/80, 112/126, 168/172, 224/218, and 280/264 kg·ha −1 of K and S, respectively). K/S rates had no effect on onion biomass of roots, bulbs, and shoots during the growing season. Marketable and total number and weight of onion bulbs and individual bulb weight were also unaffected by K/S rate. Incidences of bolting, double bulbs, Botrytis leaf blight ( Botrytis cinerea ), and sour skin ( Burkholderia cepacia ), and bulb dry weight, soluble solids content (SSC), and pungency (pyruvate concentration) were unaffected by K/S rates. In conclusion, K/S rates had little effect on plant growth and bulb yield and quality. The lack of response of onion plants to K/S rates, even at the lowest rate suggests that some of the K absorbed by plants originated from K already present in the soil before planting. The average K content of sweet onion whole plants was 80 kg·ha −1 K. Thus, under our experimental conditions, application of K rates above the recommended value (84 kg·ha −1 K) are unnecessary and will likely not improve plant growth, yield, or quality. Regarding S, rates higher than 80 kg·ha −1 S are probably unnecessary and will not enhance either plant growth or bulb yield or quality of sweet onion.
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Claims 10
Claim · model-written summary
K/S fertilization rates had no effect on onion biomass of roots, bulbs and shoots during the growing season.
- Taxon
- Allium cepa
Allium cepat0 - Organ / stage
- roots, bulbs, and shootse1
- Treatment
- K/S ratese1
- Outcome
- onion biomass of roots, bulbs, and shootse1
- Direction
- no effecte1
- Qualifier
- during the growing seasone1
- Setting
- Horticulture Farm, Tifton Campus, University of Georgiae4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Onion (Allium cepa)”
e1“K/S rates had no effect on onion biomass of roots, bulbs, and shoots during the growing season”
e4“Experiments were conducted at the Horticulture Farm, Tifton Campus, University of Georgia, in the Winters of 2012–13 and 2013–14”
Claim · model-written summary
K/S rate did not affect the marketable and total number and weight of onion bulbs.
- Taxon
- Allium cepaAllium cepat0
- Treatment
- K/S ratee2
- Outcome
- Marketable and total number and weight of onion bulbse2
- Direction
- unaffectede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Onion (Allium cepa)”
e2“Marketable and total number and weight of onion bulbs and individual bulb weight were also unaffected by K/S rate”
Claim · model-written summary
K/S rate did not affect individual bulb weight.
- Taxon
- Allium cepaAllium cepat0
- Treatment
- K/S ratee2
- Outcome
- individual bulb weighte2
- Direction
- unaffectede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Onion (Allium cepa)”
e2“Marketable and total number and weight of onion bulbs and individual bulb weight were also unaffected by K/S rate”
Claim · model-written summary
K/S rates did not affect incidences of bolting and double bulbs.
- Taxon
- Allium cepaAllium cepat0
- Treatment
- K/S ratese3
- Outcome
- Incidences of bolting, double bulbse3
- Direction
- unaffectede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Onion (Allium cepa)”
e3“Incidences of bolting, double bulbs, Botrytis leaf blight ( Botrytis cinerea ), and sour skin ( Burkholderia cepacia ), and bulb dry weight, soluble solids content (SSC), and pungency (pyruvate concentration) were unaffected by K/S rates”
Claim · model-written summary
K/S rates did not affect incidence of Botrytis leaf blight caused by Botrytis cinerea.
- Taxon
- Allium cepaAllium cepat0
- Treatment
- K/S ratese3
- Interactor
- Botrytis cinerea
Botrytis cinereae3pathogen - Outcome
- Botrytis leaf blighte3
- Direction
- unaffectede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Onion (Allium cepa)”
e3“Incidences of bolting, double bulbs, Botrytis leaf blight ( Botrytis cinerea ), and sour skin ( Burkholderia cepacia ), and bulb dry weight, soluble solids content (SSC), and pungency (pyruvate concentration) were unaffected by K/S rates”
Claim · model-written summary
K/S rates did not affect incidence of sour skin caused by Burkholderia cepacia.
- Taxon
- Allium cepaAllium cepat0
- Treatment
- K/S ratese3
- Interactor
- Burkholderia cepacia
Burkholderia cepaciae3pathogen - Outcome
- sour skine3
- Direction
- unaffectede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Onion (Allium cepa)”
e3“Incidences of bolting, double bulbs, Botrytis leaf blight ( Botrytis cinerea ), and sour skin ( Burkholderia cepacia ), and bulb dry weight, soluble solids content (SSC), and pungency (pyruvate concentration) were unaffected by K/S rates”
Claim · model-written summary
K/S rates did not affect bulb dry weight, soluble solids content and pungency.
- Taxon
- Allium cepaAllium cepat0
- Treatment
- K/S ratese3
- Outcome
- bulb dry weight, soluble solids content (SSC), and pungencye3
- Direction
- unaffectede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Onion (Allium cepa)”
e3“Incidences of bolting, double bulbs, Botrytis leaf blight ( Botrytis cinerea ), and sour skin ( Burkholderia cepacia ), and bulb dry weight, soluble solids content (SSC), and pungency (pyruvate concentration) were unaffected by K/S rates”
Claim · model-written summary
The average K content of sweet onion whole plants was 80 kg/ha K.
- Taxon
- Allium cepaAllium cepat0
- Outcome
- average K content of sweet onion whole plantse5
- Value
- 80 kg·ha −1 Ke5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Onion (Allium cepa)”
e5“The average K content of sweet onion whole plants was 80 kg·ha −1 K”
Claim · model-written summary
Application of K rates above the recommended value (84 kg/ha K) is unnecessary and will likely not improve plant growth, yield or quality.
- Taxon
- Allium cepaAllium cepat0
- Outcome
- application of K rates above the recommended valuee6
- Value
- 84 kg·ha −1 Ke6
- Qualifier
- will likely not improve plant growth, yield, or qualitye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Onion (Allium cepa)”
e6“application of K rates above the recommended value (84 kg·ha −1 K) are unnecessary and will likely not improve plant growth, yield, or quality”
Claim · model-written summary
Sulfur rates higher than 80 kg/ha are probably unnecessary and will not enhance plant growth, bulb yield or quality.
- Taxon
- Allium cepaAllium cepat0
- Outcome
- rates higher than 80 kg·ha −1 Se7
- Value
- 80 kg·ha −1 Se7
- Qualifier
- will not enhance either plant growth or bulb yield or quality of sweet onione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweet Onion (Allium cepa)”
e7“rates higher than 80 kg·ha −1 S are probably unnecessary and will not enhance either plant growth or bulb yield or quality of sweet onion”
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