Abstract
The effect of non-woven fabric floating row covers on the growth and yield of spring-sown, direct-seeded onions was investigated in Hokkaido, a subarctic island of Japan. Field experiments were carried out in 2014, 2015, and 2017. The seeds were sown in late April in each year. Floating row covers were installed a few days after seeding and kept in place until the end of May. During the treatment period, average daily maximum and minimum soil temperatures were approximately 4-5C and 1-3C higher, respectively, under covered compared with uncovered treatment. The effect of row covers on soil moisture varied annually. Emergence was obviously accelerated by floating row covers, as evidenced by an emergence date that was 1 to 4 days earlier than that of the uncovered treatment. Growth during early stages was promoted by floating row covers; however, the difference in plant growth between covered and uncovered treatments gradually decreased, with an almost non-significant difference observed by the beginning of bulb formation. The effect on growth earliness differed between years and an earlier lodging time was observed in 2015, in which the sunshine duration during the covered period of about 40 days reached 350 hours and the soil temperature difference between covered and uncovered treatments was larger than the other 2 years. Floating row covers had little effect on bulb yield. As for other growth aspects, decreased survival under floating row covers due to heat injury was observed when high temperature and drought simultaneously occurred. Floating row covers also tended to decrease onion maggot feeding damage. Non-woven fabric floating row covers effectively promote the emergence and early growth of spring-sown, direct-seeded onions mainly by elevating soil temperature. Although the degree differs depending on the year, earlier bulb formation and lodging, and a decrease in onion maggot feeding damage are also expected. These results suggest that non-woven fabric floating row covers may be a viable option to reduce the risks of delay in emergence, growth suppression caused by low temperatures, delay in lodging time and feeding damage due to onion maggot.
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Claims 13
Claim · model-written summary
Row covers raised mean daily maximum soil temperature by about 4-5C.
- Taxon
- onions
Allium cepat0 - Treatment
- coverede0
- Outcome
- average daily maximum and minimum soil temperaturese0
- Direction
- highere0
- Value
- 4-5Ce0
- Comparator
- uncovered treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“average daily maximum and minimum soil temperatures were approximately 4-5C and 1-3C higher, respectively, under covered compared with uncovered treatment”
t0“Onions”
Claim · model-written summary
Row covers raised mean daily minimum soil temperature by about 1-3C.
- Taxon
- onionsAllium cepat0
- Treatment
- coverede0
- Outcome
- minimum soil temperaturese0
- Direction
- highere0
- Value
- 1-3Ce0
- Comparator
- uncovered treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“average daily maximum and minimum soil temperatures were approximately 4-5C and 1-3C higher, respectively, under covered compared with uncovered treatment”
t0“Onions”
Claim · model-written summary
The effect of row covers on soil moisture varied by year.
- Taxon
- onionsAllium cepat0
- Outcome
- effect of row covers on soil moisturee0
- Direction
- variede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of row covers on soil moisture varied annually.”
t0“Onions”
Claim · model-written summary
Row covers advanced onion emergence by 1 to 4 days.
- Taxon
- onionsAllium cepat0
- Treatment
- floating row coverse0
- Outcome
- emergence datee0
- Direction
- earliere0
- Value
- 1 to 4 dayse0
- Comparator
- uncovered treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Emergence was obviously accelerated by floating row covers, as evidenced by an emergence date that was 1 to 4 days earlier than that of the uncovered treatment.”
t0“Onions”
Claim · model-written summary
Row covers promoted early growth.
- Taxon
- onionsAllium cepat0
- Treatment
- floating row coverse0
- Outcome
- Growth during early stagese0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth during early stages was promoted by floating row covers”
t0“Onions”
Claim · model-written summary
The growth difference between covered and uncovered onions diminished toward bulb formation and was almost nonsignificant then.
- Taxon
- onionsAllium cepat0
- Treatment
- coverede0
- Outcome
- difference in plant growthe0
- Direction
- decreasede0
- Qualifier
- by the beginning of bulb formatione0
- Comparator
- uncovered treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the difference in plant growth between covered and uncovered treatments gradually decreased, with an almost non-significant difference observed by the beginning of bulb formation”
t0“Onions”
Claim · model-written summary
Row covers advanced lodging in 2015.
- Taxon
- onionsAllium cepat0
- Treatment
- Floating Row Coverst0
- Outcome
- lodging timee0
- Direction
- earliere0
- Qualifier
- in 2015e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an earlier lodging time was observed in 2015”
t0“The Effect of Non-Woven Fabric Floating Row Covers on the Emergence, Growth, and Bulb Yield of Direct-seeded Onions (Allium cepa L.) in a Subarctic Area”
Claim · model-written summary
Row covers had little effect on bulb yield.
- Taxon
- onionsAllium cepat0
- Treatment
- Floating row coverse0
- Outcome
- bulb yielde0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Floating row covers had little effect on bulb yield.”
t0“Onions”
Claim · model-written summary
Row covers decreased onion survival under simultaneous heat and drought.
- Taxon
- onionsAllium cepat0
- Treatment
- floating row coverse0
- Outcome
- survivale0
- Direction
- decreasede0
- Qualifier
- when high temperature and drought simultaneously occurrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased survival under floating row covers due to heat injury was observed when high temperature and drought simultaneously occurred”
t0“Onions”
Claim · model-written summary
Row covers tended to reduce onion maggot feeding damage.
- Taxon
- onionsAllium cepat0
- Treatment
- Floating row coverse0
- Interactor
- onion maggot
Delia antiquae0pest - Outcome
- onion maggot feeding damagee0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Floating row covers also tended to decrease onion maggot feeding damage.”
t0“Onions”
Claim · model-written summary
The authors attributed improved emergence and early growth mainly to warmer soil under row covers.
- Taxon
- onionsAllium cepae0
- Treatment
- Non-woven fabric floating row coverse0
- Outcome
- emergence and early growthe0
- Qualifier
- mainly by elevating soil temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non-woven fabric floating row covers effectively promote the emergence and early growth of spring-sown, direct-seeded onions mainly by elevating soil temperature.”
Claim · model-written summary
The authors expect earlier bulb formation under row covers, depending on year.
- Taxon
- onionsAllium cepat0
- Outcome
- earlier bulb formatione0
- Qualifier
- degree differs depending on the yeare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although the degree differs depending on the year, earlier bulb formation and lodging, and a decrease in onion maggot feeding damage are also expected.”
t0“Onions”
Claim · model-written summary
The authors suggested row covers to reduce emergence, growth, lodging and onion maggot damage risks.
- Taxon
- onionsAllium cepat0
- Interactor
- onion maggotDelia antiquae0pest
- Outcome
- viable option to reduce the risks of delay in emergence, growth suppression caused by low temperatures, delay in lodging time and feeding damage due to onion maggote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-woven fabric floating row covers may be a viable option to reduce the risks of delay in emergence, growth suppression caused by low temperatures, delay in lodging time and feeding damage due to onion maggot.”
t0“Onions”
The same questions in other papers
trap barrier · growth · Allium cepa (onion)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
trap barrier · yield · Allium cepa (onion)Positive and negative results
3 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
6 papers more in this group
See all 10 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.