Abstract
Storage is a prerequisite for a year-round supply of domestic vegetables.The quality of vegetables after long-term storage is primarily determined during the growing season, and storage conditions can only help to maintain the quality as long as possible.Similarly, the quantity of the marketable yield is determined by conditions during the growing season, and loss during storage is affected by both pre-and postharvest factors.This study aimed to show how the quality and quantity of carrot at harvest and after storage can be better controlled.The main emphasis was on the effects of harvest time on yield, storability and sensory quality, with the aim of optimising the timing of harvest.In addition, development of the carrot plant during the growing season was investigated to characterise the determinants of yield production.The sugar composition of carrot storage root was studied as a possible descriptor of the plant's stage of development.Field experiments were conducted at the Vegetable Experimental Site of the Agricultural Research Centre of Finland and on vegetable farms in 1995-1998.Two cultivars, 'Fontana' and 'Panther', were used, and there were 3-6 harvests in September-October.Despite the large variation in average yield at different growing sites, the yield increase generally ceased in early October.On average, 10-36% of the total yield at the final harvest was produced after early September, when the weather was already less favourable for growth.This suggests that carrot still has considerable potential for yield production late in the growing season.The yield increase during the harvest period can be estimated on the basis of thermal time.Delaying the harvest improved storability up to late September or early October; thereafter storability remained at the same level.Only a prolonged period of frost injured the plants so severely that their storability declined.The effect of harvest time was similar irrespective of cultivar, growing site, year and storage conditions.Weather conditions did not account for the improved storability.It is hypothesised that the concentration of antifungal substances increases at the end of the growing season, which makes the storage roots more resistant to storage pathogens.Healing at 10C for 7 days was effective in decreasing the incidence of infections caused by Mycocentrospora acerina.Changes in sugar content and composition during the harvest period were dependent on the year and growing site, and do not provide evidence for the existence of any developmental stage definable as maturity.Neither do changes during storage
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Claims 10
Claim · model-written summary
Yield increase generally ceased in early October.
- Taxon
- carrot
Daucus carotat0 - Outcome
- yield increase generally ceasede0
- Qualifier
- early Octobere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the yield increase generally ceased in early October”
t0“carrot”
Claim · model-written summary
Ten to 36 percent of final yield was produced after early September.
- Taxon
- carrotDaucus carotat0
- Outcome
- total yield at the final harveste0
- Value
- 10-36%e0
- Qualifier
- after early Septembere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“10-36% of the total yield at the final harvest was produced after early September”
t0“carrot”
Claim · model-written summary
Thermal time could estimate yield increase during the harvest period.
- Taxon
- carrotDaucus carotat0
- Outcome
- yield increasee0
- Comparator
- thermal timee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield increase during the harvest period can be estimated on the basis of thermal time”
t0“carrot”
Claim · model-written summary
Delaying harvest improved storability until late September or early October.
- Taxon
- carrotDaucus carotat0
- Treatment
- Delaying the harveste0
- Outcome
- storabilitye0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delaying the harvest improved storability up to late September or early October; thereafter storability remained at the same level”
t0“carrot”
Claim · model-written summary
Prolonged frost injured plants and reduced storability.
- Taxon
- carrotDaucus carotat0
- Treatment
- a prolonged period of froste0
- Outcome
- storabilitye0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only a prolonged period of frost injured the plants so severely that their storability declined”
t0“carrot”
Claim · model-written summary
Harvest-time effects were similar across cultivar, site, year and storage conditions.
- Taxon
- carrotDaucus carotat0
- Outcome
- effect of harvest time was similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of harvest time was similar irrespective of cultivar, growing site, year and storage conditions”
t0“carrot”
Claim · model-written summary
Weather did not explain improved storability.
- Taxon
- carrotDaucus carotat0
- Outcome
- Weather conditions did not account for the improved storabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Weather conditions did not account for the improved storability”
t0“carrot”
Claim · model-written summary
Antifungal substance concentration was hypothesized to rise at season end, raising resistance.
- Taxon
- carrotDaucus carotat0
- Compound
- antifungal substancese0
- Outcome
- storage roots more resistant to storage pathogense0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is hypothesised that the concentration of antifungal substances increases at the end of the growing season, which makes the storage roots more resistant to storage pathogens”
t0“carrot”
Claim · model-written summary
Healing at 10C for 7 days decreased Mycocentrospora acerina infections.
- Taxon
- carrotDaucus carotat0
- Treatment
- Healing at 10C for 7 dayse0
- Interactor
- Mycocentrospora acerina
_--_Gerhard_Bedlan.jpg?width=60)
Mycocentrospora acerinae0pathogen - Outcome
- incidence of infections caused by Mycocentrospora acerinae0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_--_Gerhard_Bedlan.jpg?width=500)
Verbatim
e0“Healing at 10C for 7 days was effective in decreasing the incidence of infections caused by Mycocentrospora acerina”
t0“carrot”
Claim · model-written summary
Sugar content and composition changes depended on year and site.
- Taxon
- carrotDaucus carotat0
- Outcome
- sugar content and compositione0
- Setting
- growing sitee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Changes in sugar content and composition during the harvest period were dependent on the year and growing site”
t0“carrot”
The same questions in other papers
cold · quality: postharvest · Daucus carota (carrot)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 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.