Abstract
SummaryThe use of the sprout-inhibiting chemical maleic hydrazide may be unwanted or banned in bulb onion production. The work reported here was initiated to find alternative production techniques that can reduce sprouting in onions after long-term storage. Field experiments were conducted in Denmark between 1997 to 2001 to investigate the effects of cultivar, maturity at harvest, storage temperature, and transplanting (as opposed to direct sowing) on sprouting tendency after cool storage for 6 to 9 months. Sprouting tendency was measured by shelf-life tests at 15°C. The results showed that use of new low-sprouting cultivars, and early harvest at 20–50% “top fall-down”, gave less and slower sprouting in onions after long-term storage. The low-sprouting cultivars were ‘Summit’, ‘Wembley’, and ‘Trafford’. Harvest at 20–50% “top fall-down” postponed the onset of sprouting by 7–10 days compared to harvest at 80% “top fall-down”; but it also reduced the yield by about 15% and the number of large onions. Early harvested onions had a higher dry matter content than late harvested onions. Refrigerated cool storage at 1°C for 8 months resulted in about 5 times lower initial rate of sprouting than storage at 5°C. The use of transplants with 5 seedlings per plug is about 3 times more expensive to establish than direct sowing; but transplanted onions were consistently harvested about 3 weeks earlier, and gave about 10 t ha–1 higher yield as well as larger bulbs. The use of transplants, instead of direct sowing, only resulted in lower sprouting in 2 out of 3 years. The alternative production techniques presented here can reduce sprouting of onions not treated with maleic hydrazide. Published results suggest that a combination of these production techniques and low nitrogen and irrigation treatments can give even higher levels of sprouting resistance.
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Claims 14
Claim · model-written summary
New low sprouting cultivars produced less and slower sprouting after long storage.
- Taxon
- onions
Allium cepae0 - Treatment
- new low-sprouting cultivarse0
- Outcome
- sproutinge0
- Direction
- less and slowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“use of new low-sprouting cultivars, and early harvest at 20–50% “top fall-down”, gave less and slower sprouting in onions after long-term storage”
Claim · model-written summary
Early harvest at 20–50% top fall-down gave less and slower sprouting after long storage.
- Taxon
- onionsAllium cepae0
- Treatment
- early harvest at 20–50% “top fall-down”e0
- Outcome
- sproutinge0
- Direction
- less and slowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early harvest at 20–50% “top fall-down”, gave less and slower sprouting in onions after long-term storage”
Claim · model-written summary
Summit, Wembley and Trafford were identified as low sprouting cultivars.
Verbatim
e0“The low-sprouting cultivars were ‘Summit’, ‘Wembley’, and ‘Trafford’.”
t0“bulb onions”
Claim · model-written summary
Harvest at 20–50% top fall-down delayed sprouting onset by 7–10 days compared with harvest at 80%.
Verbatim
e0“Harvest at 20–50% “top fall-down” postponed the onset of sprouting by 7–10 days compared to harvest at 80% “top fall-down””
t0“bulb onions”
Claim · model-written summary
Harvest at 20–50% top fall-down reduced yield by about 15% versus harvest at 80%.
Verbatim
e0“Harvest at 20–50% “top fall-down” postponed the onset of sprouting by 7–10 days compared to harvest at 80% “top fall-down”; but it also reduced the yield by about 15%”
t0“bulb onions”
Claim · model-written summary
Early harvest reduced the number of large onions.
- Taxon
- onionsAllium cepat0
- Treatment
- early harvestt0
- Outcome
- number of large onionse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but it also reduced the yield by about 15% and the number of large onions”
t0“Early harvested onions”
Claim · model-written summary
Early harvested onions had higher dry matter content than late harvested onions.
- Taxon
- onionsAllium cepae0
- Treatment
- Early harvestede0
- Outcome
- dry matter contente0
- Direction
- highere0
- Comparator
- late harvested onionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early harvested onions had a higher dry matter content than late harvested onions.”
t0“bulb onions”
Claim · model-written summary
Storage at 1°C for eight months gave an approximately fivefold lower initial sprouting rate than storage at 5°C.
Verbatim
e0“Refrigerated cool storage at 1°C for 8 months resulted in about 5 times lower initial rate of sprouting than storage at 5°C.”
t0“bulb onions”
Claim · model-written summary
Transplants with five seedlings per plug cost about three times more to establish than direct sowing.
Verbatim
e0“The use of transplants with 5 seedlings per plug is about 3 times more expensive to establish than direct sowing”
t0“bulb onions”
Claim · model-written summary
Transplanted onions were harvested about three weeks earlier than direct sown onions.
- Taxon
- onionsAllium cepae0
- Treatment
- transplantede0
- Outcome
- harvestede0
- Direction
- earliere0
- Value
- about 3 weekse0
- Comparator
- direct sowingt0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transplanted onions were consistently harvested about 3 weeks earlier”
t0“transplanting (as opposed to direct sowing)”
Claim · model-written summary
Transplanted onions yielded about 10 t ha–1 more than direct sown onions.
- Taxon
- onionsAllium cepae0
- Treatment
- transplantede0
- Outcome
- yielde0
- Direction
- highere0
- Value
- about 10 t ha–1e0
- Comparator
- direct sowingt0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transplanted onions were consistently harvested about 3 weeks earlier, and gave about 10 t ha–1 higher yield”
t0“transplanting (as opposed to direct sowing)”
Claim · model-written summary
Transplants produced larger onion bulbs than direct sowing.
- Taxon
- onionsAllium cepae0
- Treatment
- transplantede0
- Outcome
- bulbse0
- Direction
- largere0
- Comparator
- direct sowingt0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transplanted onions were consistently harvested about 3 weeks earlier, and gave about 10 t ha–1 higher yield as well as larger bulbs”
t0“transplanting (as opposed to direct sowing)”
Claim · model-written summary
Transplanting reduced sprouting in two of three years.
Verbatim
e0“The use of transplants, instead of direct sowing, only resulted in lower sprouting in 2 out of 3 years.”
t0“bulb onions”
Claim · model-written summary
The tested production approaches can reduce sprouting of onions without maleic hydrazide.
- Taxon
- onionsAllium cepae0
- Treatment
- alternative production techniquese0
- Outcome
- reduce sproutinge0
- Qualifier
- not treated with maleic hydrazidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The alternative production techniques presented here can reduce sprouting of onions not treated with maleic hydrazide.”
The same questions in other papers
transplanting · yield · Allium cepa (onion)Positive and negative results
61 papers in the same direction as this paper · 7 in the opposite direction · 2 reporting no difference from an alternative
- negative
- no effect
- negative
67 papers more in this group
See all 71 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.