Paper · 1958 · Agronomy Journal

The Effect of Different Fertility Levels on Yield, Persistence, and Chemical Composition of Alfalfa1

John L. Gerwig; Gilbert H. Ahlgren

5
claims
10
verbatim quotes
22
citations
2
research areas
—
Not open access

Abstract

Synopsis Potash was the most important factor in maintaining high yields and persistence of an alfalfa stand. The “critical percentage” for potassium content varied from season to season and probably lies somewhere between 1.42 and 1.84%. Nitrogen fertilization tended to decrease yields and stands whereas phosphorus had no significant beneficial effect.

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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 5

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Potash was the most important factor maintaining high alfalfa yield and stand persistence.

Taxon
AlfalfaMedicago sativat0
Treatment
Potashe0
Outcome
high yields and persistencee0
Direction
highe0

Not reportedComparator

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

Medicago sativa
Medicago sativa · TaxonDrepanostoma · CC BY 4.0 · iNaturalist ↗

Verbatim

e0

“Potash was the most important factor in maintaining high yields and persistence of an alfalfa stand”

✓ located verbatim in the source · abstract, characters 9–108 · show in text ↑
t0

“Alfalfa”

✓ located verbatim in the source · title, characters 92–99 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

The critical potassium percentage varied between seasons.

Taxon
AlfalfaMedicago sativat0
Outcome
critical percentage” for potassium contente0
Direction
variede0
Value
1.42 and 1.84%e0
Qualifier
probablye0

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

Medicago sativa
Medicago sativa · TaxonDrepanostoma · CC BY 4.0 · iNaturalist ↗

Verbatim

e0

“The “critical percentage” for potassium content varied from season to season and probably lies somewhere between 1.42 and 1.84%”

✓ located verbatim in the source · abstract, characters 110–237 · show in text ↑
t0

“Alfalfa”

✓ located verbatim in the source · title, characters 92–99 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Nitrogen fertilization tended to decrease alfalfa yields.

Taxon
AlfalfaMedicago sativat0
Treatment
Nitrogen fertilizatione0
Outcome
yieldse0
Direction
decreasee0

Not reportedComparator

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

Medicago sativa
Medicago sativa · TaxonDrepanostoma · CC BY 4.0 · iNaturalist ↗

Verbatim

e0

“Nitrogen fertilization tended to decrease yields and stands”

✓ located verbatim in the source · abstract, characters 239–298 · show in text ↑
t0

“Alfalfa”

✓ located verbatim in the source · title, characters 92–99 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Nitrogen fertilization tended to decrease alfalfa stand persistence.

Taxon
AlfalfaMedicago sativat0
Treatment
Nitrogen fertilizatione0
Outcome
standse0
Direction
decreasee0

Not reportedComparator

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

Medicago sativa
Medicago sativa · TaxonDrepanostoma · CC BY 4.0 · iNaturalist ↗

Verbatim

e0

“Nitrogen fertilization tended to decrease yields and stands”

✓ located verbatim in the source · abstract, characters 239–298 · show in text ↑
t0

“Alfalfa”

✓ located verbatim in the source · title, characters 92–99 · show in text ↑
Intervention effectobservedoriginal resultno effectnot significant (as stated)measured

Claim · model-written summary

Phosphorus had no significant beneficial effect on alfalfa.

Taxon
AlfalfaMedicago sativat0
Treatment
phosphoruse0
Outcome
beneficial effecte0
Direction
no significant beneficial effecte0

Not reportedComparator

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

Medicago sativa
Medicago sativa · TaxonDrepanostoma · CC BY 4.0 · iNaturalist ↗

Verbatim

e0

“phosphorus had no significant beneficial effect”

✓ located verbatim in the source · abstract, characters 307–354 · show in text ↑
t0

“Alfalfa”

✓ located verbatim in the source · title, characters 92–99 · show in text ↑

potassium · yield · Medicago sativa (alfalfa)Results differ

38 papers: 30 positive, 8 negative or no effect

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

  1. positive
  2. no effect
  3. no effect

34 papers more in this group

See all 38 papers →

fertilization · yield · Medicago sativa (alfalfa)Positive and negative results

184 papers: 151 positive, 33 negative or no effect

32 papers in the same direction as this paper · 151 in the opposite direction

  1. positive
  2. positive
  3. positive

180 papers more in this group

See all 184 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.