Abstract
Potassium and nitrogen are the elements present in the highest percentage in the onion dry matter. The objective of this experiment was to evaluate yield and post-harvest conservation of Vale Ouro IPA-11 onion cultivar regarding to nitrogen and potassium levels. The experiment was carried out in Petrolina-PE, Brazil, from June to September 2009. The experimental design was a completely randomized block in a 4 x 3 factorial design, composed of four nitrogen levels (0, 60, 120 and 180 kg ha-1) and three potassium levels (0, 90 and 180 kg ha-1) with three replications. The highest yield of commercial bulbs was achieved at an estimated N level of 172.6 kg ha-1. The lowest yield of noncommercial bulbs was estimated at N level of 147.0 kg ha-1. Lower percentage of smaller bulbs (class 2) were obtained by increasing levels of N x K, with a quadratic effect at the dose of 90 kg ha-1 K2O and minimum production point with 127.6 kg N ha-1 (20.3%). Regarding larger caliber bulbs (class 4), linear effects were found both in the absence and for the level of 90 kg ha-1 of K2O as levels of N were increased. When the highest level of 180 kg ha-1 K2O was applied, the level of 92.8 kg ha-1 of N was estimated as the one that would promote the highest bulb yield of this class (35.4%), and 5.3% was found in the lack of potassium fertilization.
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Claims 8
Claim · model-written summary
Maximum commercial bulb yield was estimated at 172.6 kg ha-1 N.
- Taxon
- onion
Allium cepae1 - Material
- Vale Ouro IPA-11e1
- Treatment
- N level of 172.6 kg ha-1e0
- Outcome
- yield of commercial bulbse0
- Direction
- higheste0
- Value
- 172.6 kg ha-1e0
- Setting
- Petrolina-PE, Brazile2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest yield of commercial bulbs was achieved at an estimated N level of 172.6 kg ha-1.”
e1“Vale Ouro IPA-11 onion cultivar”
e2“Petrolina-PE, Brazil”
Claim · model-written summary
Minimum noncommercial bulb yield was estimated at 147.0 kg ha-1 N.
- Taxon
- onionAllium cepae1
- Treatment
- N level of 147.0 kg ha-1e0
- Outcome
- yield of noncommercial bulbse0
- Direction
- loweste0
- Value
- 147.0 kg ha-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest yield of noncommercial bulbs was estimated at N level of 147.0 kg ha-1.”
e1“Vale Ouro IPA-11 onion cultivar”
Claim · model-written summary
Increasing N x K lowered the percentage of class 2 bulbs.
- Taxon
- onionAllium cepae1
- Treatment
- increasing levels of N x Ke0
- Outcome
- percentage of smaller bulbs (class 2)e0
- Direction
- Lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lower percentage of smaller bulbs (class 2) were obtained by increasing levels of N x K”
e1“Vale Ouro IPA-11 onion cultivar”
Claim · model-written summary
At 90 kg ha-1 K2O, class 2 bulb production had a quadratic response and a minimum of 20.3% at 127.6 kg N ha-1.
- Taxon
- onionAllium cepae1
- Treatment
- 90 kg ha-1 K2Oe0
- Outcome
- percentage of smaller bulbs (class 2)e0
- Direction
- minimume0
- Value
- 20.3%e0
- Qualifier
- 127.6 kg N ha-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lower percentage of smaller bulbs (class 2) were obtained by increasing levels of N x K, with a quadratic effect at the dose of 90 kg ha-1 K2O and minimum production point with 127.6 kg N ha-1 (20.3%).”
e1“Vale Ouro IPA-11 onion cultivar”
Claim · model-written summary
Class 4 bulbs showed a linear response to increasing nitrogen without potassium.
- Taxon
- onionAllium cepae1
- Treatment
- levels of Ne0
- Outcome
- larger caliber bulbs (class 4)e0
- Qualifier
- in the absencee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regarding larger caliber bulbs (class 4), linear effects were found both in the absence and for the level of 90 kg ha-1 of K2O as levels of N were increased.”
e1“Vale Ouro IPA-11 onion cultivar”
Claim · model-written summary
Class 4 bulbs showed a linear response to increasing nitrogen at 90 kg ha-1 K2O.
- Taxon
- onionAllium cepae1
- Treatment
- levels of Ne0
- Outcome
- larger caliber bulbs (class 4)e0
- Qualifier
- 90 kg ha-1 of K2Oe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regarding larger caliber bulbs (class 4), linear effects were found both in the absence and for the level of 90 kg ha-1 of K2O as levels of N were increased.”
e1“Vale Ouro IPA-11 onion cultivar”
Claim · model-written summary
At 180 kg ha-1 K2O, 92.8 kg ha-1 N was estimated to maximize class 4 bulb yield at 35.4%.
- Taxon
- onionAllium cepae1
- Treatment
- 180 kg ha-1 K2Oe0
- Outcome
- bulb yield of this classe0
- Direction
- higheste0
- Value
- 35.4%e0
- Qualifier
- 92.8 kg ha-1 of Ne0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the highest level of 180 kg ha-1 K2O was applied, the level of 92.8 kg ha-1 of N was estimated as the one that would promote the highest bulb yield of this class (35.4%)”
e1“Vale Ouro IPA-11 onion cultivar”
Claim · model-written summary
Class 4 bulb yield was 5.3% without potassium fertilization.
- Taxon
- onionAllium cepae1
- Treatment
- lack of potassium fertilizatione0
- Outcome
- bulb yield of this classe2
- Value
- 5.3%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and 5.3% was found in the lack of potassium fertilization.”
e1“Vale Ouro IPA-11 onion cultivar”
e2“highest bulb yield of this class (35.4%)”
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