Paper · 1959 · Agronomy Journal

N and P Composition and Yield of Corn as Affected by Fertilization1

G. A. Reichman; D. L. Grunes; C. W. Carlson; et al.

5
claims
6
verbatim quotes
9
citations
3
research areas
—
Not open access

Abstract

Synopsis Corn yield and N and P percentages were increased by fertilization with N at rates up to 80 pounds per acre together with P at 22 pounds per acre. The yields were highly correlated with the N percentages in the corn leaves. Critical N levels were calculated from the data.

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Claims 5

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

N and P fertilization increased corn yield.

Treatment
fertilization with N at rates up to 80 pounds per acre together with P at 22 pounds per acree0
Outcome
yielde0
Direction
increasede0

Not reportedComparator

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

Zea mays subsp. mays
Zea mays subsp. mays · TaxonDominicus Johannes Bergsma · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“Corn yield and N and P percentages were increased by fertilization with N at rates up to 80 pounds per acre together with P at 22 pounds per acre”

✓ located verbatim in the source · abstract, characters 9–154 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Fertilization increased corn N percentage.

Treatment
fertilization with N at rates up to 80 pounds per acre together with P at 22 pounds per acree0
Outcome
Ne0
Direction
increasede0

Not reportedComparator

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

Zea mays subsp. mays
Zea mays subsp. mays · TaxonDominicus Johannes Bergsma · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“Corn yield and N and P percentages were increased by fertilization with N at rates up to 80 pounds per acre together with P at 22 pounds per acre”

✓ located verbatim in the source · abstract, characters 9–154 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Fertilization increased corn P percentage.

Treatment
fertilization with N at rates up to 80 pounds per acre together with P at 22 pounds per acree0
Outcome
P percentagese0
Direction
increasede0

Not reportedComparator

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

Zea mays subsp. mays
Zea mays subsp. mays · TaxonDominicus Johannes Bergsma · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“Corn yield and N and P percentages were increased by fertilization with N at rates up to 80 pounds per acre together with P at 22 pounds per acre”

✓ located verbatim in the source · abstract, characters 9–154 · show in text ↑
Associationobservedoriginal resultmeasured

Claim · model-written summary

Yield correlated strongly with leaf N percentage.

Organ / stage
leavese0
Outcome
yieldse0

Not reportedDirection

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

Zea mays subsp. mays
Zea mays subsp. mays · TaxonDominicus Johannes Bergsma · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“The yields were highly correlated with the N percentages in the corn leaves”

✓ located verbatim in the source · abstract, characters 156–231 · show in text ↑
Method / resourceobservedoriginal resultmeasured

Claim · model-written summary

Critical N levels were calculated.

Outcome
Critical N levelse0

Not reportedValue

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

Zea mays subsp. mays
Zea mays subsp. mays · TaxonDominicus Johannes Bergsma · CC BY-SA 4.0 · Wikimedia Commons ↗

Verbatim

e0

“Critical N levels were calculated from the data”

✓ located verbatim in the source · abstract, characters 233–280 · show in text ↑
e1

“Corn”

✓ located verbatim in the source · title, characters 33–37 · show in text ↑

fertilization · nutrient: content · Zea mays (maize)Positive and negative results

1,164 papers: 1,026 positive, 138 negative or no effect

1,025 papers in the same direction as this paper · 127 in the opposite direction · 11 reporting no difference from an alternative

  1. negative
  2. negative
  3. negative

1,160 papers more in this group

See all 1,164 papers →

fertilization · yield · Zea mays (maize)Positive and negative results

3,908 papers: 3,485 positive, 423 negative or no effect

3,484 papers in the same direction as this paper · 338 in the opposite direction · 85 reporting no difference from an alternative

  1. negative
  2. no effect
  3. negative

3,904 papers more in this group

See all 3,908 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.