Abstract
Onions were sub-irrigated with 0.6, 2.4, 4.8 and 12 mol m−3 nitrate while growing in constant photoperiods of 14, 15 or 16 h. The lower the nitrogen, the later bulb scale initiation occurred and in 14 h photoperiods bulb scales initiated only at the highest N level. In the early stages of the experiment, the ratio bulb width/neck width was higher in low N than in high N treatments, but the reverse was true at the later harvests, by which time bulb scales had formed. In a second experiment onions were sub-irrigated continuously with 0.6 mol m−3 or 12 mol m−3 nitrate or transferred from the low to high, or from high to low N after 36 d of growth in 14, 15.25 and 17 h photoperiods. An initial period of low N delayed bulb scale development and ripening relative to high N throughout, particularly under 14 h photoperiods. Late N deprivation did not prevent or delay bulb scale initiation or ripening. In a field experiment, plants not fertilized before sowing but given the total quantity of N late in the growing season formed mature bulbs later than plants fertilized with N before sowing, or given half the quantity of N before sowing and the second half late in the growing season.
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Claims 8
Claim · model-written summary
Lower nitrogen was associated with later bulb scale initiation in onion.
- Taxon
- Onions
Allium cepae0 - Treatment
- nitrogene1
- Outcome
- bulb scale initiatione1
- Direction
- latere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onions were sub-irrigated”
e1“The lower the nitrogen, the later bulb scale initiation occurred”
Claim · model-written summary
In 14 h photoperiods, onion bulb scales initiated only at the highest N level.
- Taxon
- OnionsAllium cepae0
- Treatment
- the highest N levele1
- Outcome
- bulb scales initiatede1
- Qualifier
- 14 h photoperiodse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onions were sub-irrigated”
e1“in 14 h photoperiods bulb scales initiated only at the highest N level”
Claim · model-written summary
In the early stages, the ratio of bulb width to neck width was higher in low N than in high N treatments.
- Taxon
- OnionsAllium cepae0
- Treatment
- low Ne2
- Outcome
- ratio bulb width/neck widthe2
- Direction
- highere2
- Qualifier
- In the early stages of the experimente2
- Comparator
- high N treatmentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onions were sub-irrigated”
e2“In the early stages of the experiment, the ratio bulb width/neck width was higher in low N than in high N treatments”
Claim · model-written summary
At later harvests the ratio of bulb width to neck width was reversed, with high N higher than low N.
- Taxon
- OnionsAllium cepae0
- Treatment
- low Ne2
- Outcome
- ratio bulb width/neck widthe2
- Direction
- the reverse was truee3
- Qualifier
- at the later harvestse3
- Comparator
- high N treatmentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onions were sub-irrigated”
e2“In the early stages of the experiment, the ratio bulb width/neck width was higher in low N than in high N treatments”
e3“but the reverse was true at the later harvests”
Claim · model-written summary
An initial period of low N delayed bulb scale development and ripening relative to high N, particularly under 14 h photoperiods.
- Taxon
- OnionsAllium cepae0
- Treatment
- An initial period of low Ne4
- Outcome
- bulb scale development and ripeninge4
- Direction
- delayede4
- Qualifier
- particularly under 14 h photoperiodse4
- Comparator
- high Ne4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onions were sub-irrigated”
e4“An initial period of low N delayed bulb scale development and ripening relative to high N throughout, particularly under 14 h photoperiods”
Claim · model-written summary
Late N deprivation did not prevent or delay bulb scale initiation or ripening in onion.
- Taxon
- OnionsAllium cepae0
- Treatment
- Late N deprivatione5
- Outcome
- bulb scale initiation or ripeninge5
- Direction
- did not prevent or delaye5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onions were sub-irrigated”
e5“Late N deprivation did not prevent or delay bulb scale initiation or ripening”
Claim · model-written summary
In a field experiment, plants given the total N late in the season formed mature bulbs later than plants fertilized before sowing.
- Taxon
- OnionsAllium cepae0
- Treatment
- not fertilized before sowing but given the total quantity of N late in the growing seasone6
- Outcome
- formed mature bulbse6
- Direction
- latere6
- Comparator
- plants fertilized with N before sowinge6
- Setting
- field experimente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onions were sub-irrigated”
e6“In a field experiment, plants not fertilized before sowing but given the total quantity of N late in the growing season formed mature bulbs later than plants fertilized with N before sowing”
Claim · model-written summary
In a field experiment, plants given half the N before sowing and half late formed mature bulbs later than plants fertilized before sowing.
- Taxon
- OnionsAllium cepae0
- Treatment
- half the quantity of N before sowing and the second half late in the growing seasone7
- Outcome
- formed mature bulbse6
- Direction
- latere6
- Comparator
- plants fertilized with N before sowinge6
- Setting
- field experimente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onions were sub-irrigated”
e6“In a field experiment, plants not fertilized before sowing but given the total quantity of N late in the growing season formed mature bulbs later than plants fertilized with N before sowing”
e7“or given half the quantity of N before sowing and the second half late in the growing season”
The same questions in other papers
nitrogen · quality: postharvest · Allium cepa (onion)Positive and negative results
4 papers in the same direction as this paper · 36 in the opposite direction
- positive
- positive
- positive
37 papers more in this group
See all 41 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.