Paper · 1973 · Experimental Agriculture

Effects of Fertilizers on Harvest Time and Yield of Cowpeas (Vigna unguiculata) in Sierra Leone

W. Godfrey-Sam-Aggrey

3
claims
6
verbatim quotes
3
citations
2
research areas
—
Not open access

Abstract

SUMMARY Effects of fertilizers on harvest time and yield of cowpeas were studied on upland soils in Sierra Leone. In a 2 5 confounded factorial trial, on soil which had been cropped successively with 2 years of Smooth Cayenne pineapples and 14 months of cassava, the treatments did not affect harvest time significantly, but N, P and NP Mg produced very favourable effects on grain yields. In a randomized complete block experiment on soil previously cropped with two successive cassava crops, there was a significant difference in total yield of dry pods between the control and most treatments.

Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. 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 3

Intervention effectobservedoriginal resultno effectnot significant (as stated)measured

Claim · model-written summary

Fertilizer treatments did not significantly affect harvest time of cowpeas.

Treatment
fertilizerse0
Outcome
harvest timee1
Direction
did not affecte1
Setting
Sierra Leonee0

Not reportedComparator

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

Vigna unguiculata
Vigna unguiculata · TaxonHeraldDesa at English Wikipedia · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Effects of fertilizers on harvest time and yield of cowpeas were studied on upland soils in Sierra Leone”

✓ located verbatim in the source · abstract, characters 8–112 · show in text ↑
e1

“the treatments did not affect harvest time significantly, but N, P and NP Mg produced very favourable effects on grain yields”

✓ located verbatim in the source · abstract, characters 263–388 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

N, P and NP Mg fertilizers had very favourable effects on grain yields of cowpeas.

Treatment
N, P and NP Mge1
Outcome
grain yieldse1
Direction
very favourablee1
Setting
Sierra Leonee0

Not reportedComparator

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

Vigna unguiculata
Vigna unguiculata · TaxonHeraldDesa at English Wikipedia · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Effects of fertilizers on harvest time and yield of cowpeas were studied on upland soils in Sierra Leone”

✓ located verbatim in the source · abstract, characters 8–112 · show in text ↑
e1

“the treatments did not affect harvest time significantly, but N, P and NP Mg produced very favourable effects on grain yields”

✓ located verbatim in the source · abstract, characters 263–388 · show in text ↑
Intervention effectobservedoriginal resultsignificant (as stated)measured

Claim · model-written summary

Total yield of dry pods differed significantly between the control and most fertilizer treatments of cowpeas.

Treatment
most treatmentse2
Outcome
total yield of dry podse2
Comparator
the controle2

Not reportedDirection

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

Vigna unguiculata
Vigna unguiculata · TaxonHeraldDesa at English Wikipedia · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Effects of fertilizers on harvest time and yield of cowpeas were studied on upland soils in Sierra Leone”

✓ located verbatim in the source · abstract, characters 8–112 · show in text ↑
e2

“there was a significant difference in total yield of dry pods between the control and most treatments”

✓ located verbatim in the source · abstract, characters 494–595 · show in text ↑

magnesium atom · yield · Vigna unguiculata (cowpea)Results differ

8 papers: 6 positive, 2 negative or no effect

5 papers in the same direction as this paper · 2 in the opposite direction

  1. no effect
  2. no effect
  3. positive

4 papers more in this group

See all 8 papers →

nitrogen · yield · Vigna unguiculata (cowpea)Results differ

68 papers: 62 positive, 6 negative or no effect

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

  1. no effect
  2. negative
  3. no effect

64 papers more in this group

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phosphorus · yield · Vigna unguiculata (cowpea)Results differ

113 papers: 107 positive, 6 negative or no effect

106 papers in the same direction as this paper · 5 in the opposite direction · 1 reporting no difference from an alternative

  1. no effect
  2. no effect
  3. negative

109 papers more in this group

See all 113 papers →

nanoparticle · yield · Vigna unguiculata (cowpea)Positive and negative results

17 papers: 15 positive, 2 negative or no effect

14 papers in the same direction as this paper · 2 in the opposite direction

  1. negative
  2. negative
  3. positive

13 papers more in this group

See all 17 papers →

fertilization · yield · Vigna unguiculata (cowpea)Positive and negative results

292 papers: 275 positive, 17 negative or no effect

16 papers in the same direction as this paper · 275 in the opposite direction

  1. positive
  2. positive
  3. positive

288 papers more in this group

See all 292 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.