Paper · 1971 · Journal of the American Society for Horticultural Science

Influence of Seeding Rate, Source and Level of Nitrogen on Collards1

C. G. del Valle

6
claims
12
verbatim quotes
1
citations
2
research areas
✓
Open access · cc-by-nc-nd

Abstract

Abstract Yield, color, petiole-blade ratio, and percentage of fiber and Ν were evaluated for collards ( Brassica oleracea L. var. acephala ), grown under field conditions. The yield, color, and Ν percentage in tops were increased as the Ν level was increased from 40 to 160 lb N/A. A split application of 80 1b. N/A at planting and 80 1b 20 days after planting gave the best yield. Best color was obtained at seeding rates of 2 or 4 1b/A. Leaf color decreased as the seeding rate increased from 2 to 8 1b/A. The petiole-blade ratio and fiber percentage were not significantly affected by the seeding rate or level and source of N. It was possible to obtain equally good yields and color with NaNO 3 , (NH 4 ) 2 SO 4 , or NH 4 NO 3 .

Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. Read at the source ↗

The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.

Claims 6

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Yield, color and nitrogen percentage in collard tops increased with nitrogen level from 40 to 160 lb N/A.

Treatment
Ν level was increased from 40 to 160 lb N/Ae0
Outcome
yield, color, and Ν percentage in topse0
Direction
increasede0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Brassica oleracea var. viridis
Brassica oleracea var. viridis · TaxonAnn Perry · Public domain · Wikimedia Commons ↗

Verbatim

e0

“The yield, color, and Ν percentage in tops were increased as the Ν level was increased from 40 to 160 lb N/A”

✓ located verbatim in the source · abstract, characters 172–280 · show in text ↑
e1

“collards ( Brassica oleracea L. var. acephala )”

✓ located verbatim in the source · abstract, characters 93–140 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Split nitrogen application gave the best yield.

Treatment
split application of 80 1b. N/A at planting and 80 1b 20 days after plantinge0
Outcome
yielde0
Direction
beste0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Brassica oleracea var. viridis
Brassica oleracea var. viridis · TaxonAnn Perry · Public domain · Wikimedia Commons ↗

Verbatim

e0

“A split application of 80 1b. N/A at planting and 80 1b 20 days after planting gave the best yield”

✓ located verbatim in the source · abstract, characters 282–380 · show in text ↑
e1

“collards ( Brassica oleracea L. var. acephala )”

✓ located verbatim in the source · abstract, characters 93–140 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Seeding rates of 2 or 4 lb/A produced the best color.

Treatment
seeding rates of 2 or 4 1b/Ae0
Outcome
colore0
Direction
Beste0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Brassica oleracea var. viridis
Brassica oleracea var. viridis · TaxonAnn Perry · Public domain · Wikimedia Commons ↗

Verbatim

e0

“Best color was obtained at seeding rates of 2 or 4 1b/A”

✓ located verbatim in the source · abstract, characters 382–437 · show in text ↑
e1

“collards ( Brassica oleracea L. var. acephala )”

✓ located verbatim in the source · abstract, characters 93–140 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Leaf color declined as seeding rate rose from 2 to 8 lb/A.

Treatment
seeding rate increased from 2 to 8 1b/Ae0
Outcome
Leaf colore0
Direction
decreasede0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Brassica oleracea var. viridis
Brassica oleracea var. viridis · TaxonAnn Perry · Public domain · Wikimedia Commons ↗

Verbatim

e0

“Leaf color decreased as the seeding rate increased from 2 to 8 1b/A”

✓ located verbatim in the source · abstract, characters 439–506 · show in text ↑
e1

“collards ( Brassica oleracea L. var. acephala )”

✓ located verbatim in the source · abstract, characters 93–140 · show in text ↑
Intervention effectobservedoriginal resultno effectnot significant (as stated)measured

Claim · model-written summary

Petiole-blade ratio and fiber percentage were not significantly affected by seeding rate or nitrogen level and source.

Treatment
seeding rate or level and source of Ne0
Outcome
petiole-blade ratio and fiber percentagee0
Direction
not significantly affectede0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Brassica oleracea var. viridis
Brassica oleracea var. viridis · TaxonAnn Perry · Public domain · Wikimedia Commons ↗

Verbatim

e0

“The petiole-blade ratio and fiber percentage were not significantly affected by the seeding rate or level and source of N”

✓ located verbatim in the source · abstract, characters 508–629 · show in text ↑
e1

“collards ( Brassica oleracea L. var. acephala )”

✓ located verbatim in the source · abstract, characters 93–140 · show in text ↑
Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Three nitrogen sources produced equally good yields and color.

Treatment
NaNO 3 , (NH 4 ) 2 SO 4 , or NH 4 NO 3e0
Outcome
yields and colore0
Direction
equally goode0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Brassica oleracea var. viridis
Brassica oleracea var. viridis · TaxonAnn Perry · Public domain · Wikimedia Commons ↗

Verbatim

e0

“equally good yields and color with NaNO 3 , (NH 4 ) 2 SO 4 , or NH 4 NO 3”

✓ located verbatim in the source · abstract, characters 657–730 · show in text ↑
e1

“collards ( Brassica oleracea L. var. acephala )”

✓ located verbatim in the source · abstract, characters 93–140 · show in text ↑

nitrogen · yield · Brassica oleracea (wild cabbage)Results differ

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density · quality: postharvest · Brassica oleracea (wild cabbage)Positive and negative results

10 papers: 9 positive, 1 negative or no effect

8 papers in the same direction as this paper · 1 in the opposite direction

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nitrogen · quality: postharvest · Brassica oleracea (wild cabbage)Positive and negative results

40 papers: 34 positive, 6 negative or no effect

33 papers in the same direction as this paper · 6 in the opposite direction

  1. no effect
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  3. negative

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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.