Abstract
Nitrogen is required for successful carrot production on sandy soils of the southeastern United States, yet carrot growers often apply N in amounts exceeding university recommendations. Excessive fertilization is practiced to compensate for losses of N from leaching and because some growers believe that high rates of fertilization improve vegetable quality. Carrots ( Daucus carota L. ) were grown in three plantings during Winter 1994–95 in Gainesville, Fla., to test the effects of N fertilization on yield and quality. Yield increased with N fertilization but the effect of N rate depended on planting date; 150 kg·ha –1 N maximized yield for November and December plantings but 180 kg·ha –1 N was sufficient for the January planting. Concentration of total alcohol-soluble sugar was maximized at 45 mg·g –1 fresh root with 140 kg·ha –1 N for `Choctaw' carrots, whereas sugar concentration of `Scarlet Nantes' roots was not affected by N fertilization. Carrot root carotenoid concentration was maximized at 55 mg·kg –1 fresh root tissue with 160 kg·ha –1 N. Generally, those N fertilization rates that maximized carrot root yield also maximized carrot quality as determined by sugar and carotenoid concentrations.
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Claims 7
Claim · model-written summary
Carrot yield increased with N fertilization.
- Taxon
- Daucus carota
Daucus carotae2 - Treatment
- N fertilizatione1
- Outcome
- Yielde1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Yield increased with N fertilization”
e2“Carrots ( Daucus carota L. ) were grown in three plantings”
Claim · model-written summary
For November and December plantings, 150 kg N per ha maximized carrot yield.
- Taxon
- Daucus carotaDaucus carotae2
- Treatment
- 150 kg·ha –1 Ne3
- Outcome
- yielde3
- Direction
- maximizede3
- Qualifier
- November and December plantingse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Carrots ( Daucus carota L. ) were grown in three plantings”
e3“150 kg·ha –1 N maximized yield for November and December plantings”
Claim · model-written summary
For the January planting, 180 kg N per ha was sufficient for carrot yield.
- Taxon
- Daucus carotaDaucus carotae2
- Treatment
- 180 kg·ha –1 Ne4
- Outcome
- yielde3
- Direction
- sufficiente4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Carrots ( Daucus carota L. ) were grown in three plantings”
e3“150 kg·ha –1 N maximized yield for November and December plantings”
e4“180 kg·ha –1 N was sufficient for the January planting”
Claim · model-written summary
Total alcohol-soluble sugar concentration in Choctaw carrots was maximized at 140 kg N per ha.
- Taxon
- Daucus carotaDaucus carotae2
- Material
- Choctawe5
- Organ / stage
- fresh roote5
- Treatment
- 140 kg·ha –1 Ne5
- Outcome
- Concentration of total alcohol-soluble sugare5
- Direction
- maximizede5
- Value
- 45 mg·g –1e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Carrots ( Daucus carota L. ) were grown in three plantings”
e5“Concentration of total alcohol-soluble sugar was maximized at 45 mg·g –1 fresh root with 140 kg·ha –1 N for `Choctaw' carrots”
Claim · model-written summary
Sugar concentration of Scarlet Nantes carrot roots was not affected by N fertilization.
- Taxon
- Daucus carotaDaucus carotae2
- Material
- Scarlet Nantese6
- Treatment
- N fertilizatione6
- Outcome
- sugar concentratione6
- Direction
- not affectede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Carrots ( Daucus carota L. ) were grown in three plantings”
e6“sugar concentration of `Scarlet Nantes' roots was not affected by N fertilization”
Claim · model-written summary
Carrot root carotenoid concentration was maximized at 160 kg N per ha.
- Taxon
- Daucus carotaDaucus carotae2
- Organ / stage
- fresh root tissuee7
- Treatment
- 160 kg·ha –1 Ne7
- Outcome
- carotenoid concentratione7
- Direction
- maximizede7
- Value
- 55 mg·kg –1e7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Carrots ( Daucus carota L. ) were grown in three plantings”
e7“Carrot root carotenoid concentration was maximized at 55 mg·kg –1 fresh root tissue with 160 kg·ha –1 N”
Claim · model-written summary
N fertilization rates that maximized carrot root yield also maximized carrot quality.
- Taxon
- Daucus carotaDaucus carotae2
- Treatment
- N fertilizatione0
- Outcome
- carrot qualitye0
- Direction
- maximizede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Carrots ( Daucus carota L. ) were grown in three plantings”
e0“those N fertilization rates that maximized carrot root yield also maximized carrot quality”
The same questions in other papers
fertilization · yield · Daucus carota (carrot)Results differ
107 papers in the same direction as this paper · 11 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- no effect
- positive
117 papers more in this group
See all 121 papers →fertilization · quality: sugar starch · Daucus carota (carrot)Positive and negative results
1 paper in the same direction as this paper · 13 in the opposite direction
- positive
- positive
- positive
11 papers more in this group
See all 15 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.