Abstract
Abstract Nitrogen fertilization may affect the yield components and quality attributes of vegetables grown for processing. The objective of this study was to determine the effects of N fertilization systems on cabbage ( Brassica oleracea L. Capitata group) grown for kraut. The concentrations and contents of nitrate‐N and total N in the plants were used to determine the availability of N and uptake of N from the soil and/or fertilizer N during the growing season. Urea broadcast at 15 g N/m 2 and worked into the soil preplant was compared to ammonium nitrate applied at a rate of 15 g N/m 2 split into three 5 g N/m 2 applications (banded at planting time plus sidedressed early plus sidedressed midseason) as fertilization systems for cabbage grown under field conditions in 1978 and 1979. The soil was a Lima silt loam (Glossoboric Hapludalf, fine loamy, mixed mesic), a productive soil derived from calcareous glacial till. Plants were spaced 4/m 2 . Tops of four plants grown without fertilizer N contained 12 g N/m 2 at harvest. Fertilizer N applied at 15 g N/m 2 increased the total N in the plant tops to 22 g N/m 2 . This was an increase in plant N equivalent to two‐thirds of the rate of fertilizer N applied. Cabbage plants grown without fertilizer N yielded 4 kg fresh weight/m 2 . Fertilizer N at 15 g N/m 2 , either as urea or ammonium nitrate, yielded 8 kg of heads/m 2 . Fertilizer N at 30 g/m 2 from urea plus ammonium nitrate yielded 10 kg heads/m 2 . Plants grown with fertilizer N had a lower percentage of dry weight in the heads, and had higher percentages of burst heads and heads with tipburn than heads of plants grown without fertilizer N. Thus, fertilizer N increased the yield but decreased the quality of cabbage heads grown for kraut.
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Claims 8
Claim · model-written summary
Unfertilized cabbage tops contained 12 g N/m 2.
- Taxon
- cabbage
Brassica oleracea var. capitatat0 - Organ / stage
- Topse0
- Treatment
- without fertilizer Ne0
- Outcome
- Ne0
- Value
- 12 g N/m 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tops of four plants grown without fertilizer N contained 12 g N/m 2 at harvest”
t0“Cabbage”
Claim · model-written summary
Fertilizer N increased nitrogen in cabbage tops to 22 g N/m 2.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Organ / stage
- plant topse0
- Treatment
- Fertilizer N applied at 15 g N/m 2e0
- Outcome
- total Ne0
- Direction
- increasede0
- Value
- 22 g N/m 2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer N applied at 15 g N/m 2 increased the total N in the plant tops to 22 g N/m 2”
t0“Cabbage”
Claim · model-written summary
The increase in plant N equaled two-thirds of applied fertilizer N.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Outcome
- plant Ne0
- Direction
- increasee0
- Value
- two‐thirdse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was an increase in plant N equivalent to two‐thirds of the rate of fertilizer N applied”
t0“Cabbage”
Claim · model-written summary
Cabbage without N fertilizer yielded 4 kg fresh weight/m 2.
- Taxon
- CabbageBrassica oleracea var. capitatae0
- Treatment
- without fertilizer Ne0
- Outcome
- fresh weighte0
- Value
- 4 kg fresh weight/m 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cabbage plants grown without fertilizer N yielded 4 kg fresh weight/m 2”
Claim · model-written summary
Fertilizer N at 15 g N/m 2 yielded 8 kg heads/m 2.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Treatment
- Fertilizer N at 15 g N/m 2e0
- Outcome
- headse0
- Value
- 8 kg of heads/m 2e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer N at 15 g N/m 2 , either as urea or ammonium nitrate, yielded 8 kg of heads/m 2”
t0“Cabbage”
Claim · model-written summary
Fertilizer N at 30 g/m 2 yielded 10 kg heads/m 2.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Treatment
- Fertilizer N at 30 g/m 2 from urea plus ammonium nitratee0
- Outcome
- headse0
- Value
- 10 kg heads/m 2e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer N at 30 g/m 2 from urea plus ammonium nitrate yielded 10 kg heads/m 2”
t0“Cabbage”
Claim · model-written summary
Fertilized heads had lower dry weight percentage.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Treatment
- fertilizer Ne0
- Outcome
- percentage of dry weight in the headse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown with fertilizer N had a lower percentage of dry weight in the heads”
t0“Cabbage”
Claim · model-written summary
Fertilization increased percentages of burst heads and tipburn.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Outcome
- burst heads and heads with tipburne0
- Direction
- highere0
- Comparator
- plants grown without fertilizer Ne0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“had higher percentages of burst heads and heads with tipburn than heads of plants grown without fertilizer N”
t0“Cabbage”
The same questions in other papers
nitrogen · nutrient: content · Brassica oleracea (wild cabbage)Positive and negative results
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- no effect
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126 papers in the same direction as this paper · 17 in the opposite direction · 2 reporting no difference from an alternative
- negative
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See all 146 papers →fertilization · growth · Brassica oleracea (wild cabbage)Positive and negative results
23 papers in the same direction as this paper · 240 in the opposite direction
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See all 264 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.