Paper · 1967 · Agronomy Journal

Effect of Plant Population and Row Spacing on Evapotranspiration and Water‐Use Efficiency by Soybeans1

D. R. Timmons; R. F. Holt; R. L. Thompson

7
claims
16
verbatim quotes
18
citations
2
research areas
—
Not open access

Abstract

Abstract During 1964 and 1965, Chippewa and Merit soybeans were planted in 20‐, 61‐, and 102‐cm rows at populations attained from seeding rates of approximately 34, 67, and 135 kg/ha. Evapotranspiration from planting to the first killing frost ranged from 32.8 to 38.0 cm and from 42.3 to 46.2 cm for 1964 and 1965, respectively. Neither row spacing nor plant population significantly affected evapotranspiration during the 2 years studied. Generally, highest water‐use efficiencies were obtained for the lower plant populations in 20‐cm rows. Soybeans produced per hectare‐centimeter of water used varied from 55 to 60 kg for 1964 and from 50 to 59 kg for 1965.

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Claims 7

Intervention effectobservedoriginal resultno effectnot significant (as stated)measured

Claim · model-written summary

Row spacing did not significantly affect evapotranspiration of soybeans during the two years studied.

Taxon
soybeansGlycine maxe1
Treatment
row spacinge2
Outcome
evapotranspiratione2
Direction
significantly affectede2

Not reportedComparator

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

Glycine max
Glycine max · TaxonPublic domain · Wikimedia Commons ↗

Verbatim

e1

“Chippewa and Merit soybeans were planted”

✓ located verbatim in the source · abstract, characters 31–71 · show in text ↑
e2

“Neither row spacing nor plant population significantly affected evapotranspiration during the 2 years studied”

✓ located verbatim in the source · abstract, characters 330–439 · show in text ↑
Intervention effectobservedoriginal resultno effectnot significant (as stated)measured

Claim · model-written summary

Plant population did not significantly affect evapotranspiration of soybeans during the two years studied.

Taxon
soybeansGlycine maxe1
Treatment
plant populatione2
Outcome
evapotranspiratione2
Direction
significantly affectede2

Not reportedComparator

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

Glycine max
Glycine max · TaxonPublic domain · Wikimedia Commons ↗

Verbatim

e1

“Chippewa and Merit soybeans were planted”

✓ located verbatim in the source · abstract, characters 31–71 · show in text ↑
e2

“Neither row spacing nor plant population significantly affected evapotranspiration during the 2 years studied”

✓ located verbatim in the source · abstract, characters 330–439 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Highest water‐use efficiencies were obtained at the lower plant populations.

Taxon
soybeansGlycine maxe1
Treatment
lower plant populationse4
Outcome
water‐use efficienciese4
Direction
higheste4

Not reportedComparator

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

Glycine max
Glycine max · TaxonPublic domain · Wikimedia Commons ↗

Verbatim

e1

“Chippewa and Merit soybeans were planted”

✓ located verbatim in the source · abstract, characters 31–71 · show in text ↑
e4

“Generally, highest water‐use efficiencies were obtained for the lower plant populations in 20‐cm rows”

✓ located verbatim in the source · abstract, characters 441–542 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

Soybeans produced 55 to 60 kg per hectare-centimetre of water used in 1964.

Taxon
soybeansGlycine maxe1
Outcome
produced per hectaree5
Value
55 to 60 kge6
Setting
1964e6

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

Glycine max
Glycine max · TaxonPublic domain · Wikimedia Commons ↗

Verbatim

e1

“Chippewa and Merit soybeans were planted”

✓ located verbatim in the source · abstract, characters 31–71 · show in text ↑
e5

“Soybeans produced per hectare”

✓ located verbatim in the source · abstract, characters 544–573 · show in text ↑
e6

“varied from 55 to 60 kg for 1964”

✓ located verbatim in the source · abstract, characters 599–631 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

Soybeans produced 50 to 59 kg per hectare-centimetre of water used in 1965.

Taxon
soybeansGlycine maxe1
Outcome
produced per hectaree5
Value
50 to 59 kge7
Setting
1965e7

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

Glycine max
Glycine max · TaxonPublic domain · Wikimedia Commons ↗

Verbatim

e1

“Chippewa and Merit soybeans were planted”

✓ located verbatim in the source · abstract, characters 31–71 · show in text ↑
e5

“Soybeans produced per hectare”

✓ located verbatim in the source · abstract, characters 544–573 · show in text ↑
e7

“from 50 to 59 kg for 1965”

✓ located verbatim in the source · abstract, characters 636–661 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

Evapotranspiration from planting to the first killing frost was 32.8 to 38.0 cm in 1964.

Taxon
soybeansGlycine maxe1
Outcome
Evapotranspiratione3
Value
32.8 to 38.0 cme3
Setting
1964e3

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

Glycine max
Glycine max · TaxonPublic domain · Wikimedia Commons ↗

Verbatim

e1

“Chippewa and Merit soybeans were planted”

✓ located verbatim in the source · abstract, characters 31–71 · show in text ↑
e3

“Evapotranspiration from planting to the first killing frost ranged from 32.8 to 38.0 cm and from 42.3 to 46.2 cm for 1964 and 1965”

✓ located verbatim in the source · abstract, characters 184–314 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

Evapotranspiration from planting to the first killing frost was 42.3 to 46.2 cm in 1965.

Taxon
soybeansGlycine maxe1
Outcome
Evapotranspiratione3
Value
42.3 to 46.2 cme3
Setting
1965e3

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

Glycine max
Glycine max · TaxonPublic domain · Wikimedia Commons ↗

Verbatim

e1

“Chippewa and Merit soybeans were planted”

✓ located verbatim in the source · abstract, characters 31–71 · show in text ↑
e3

“Evapotranspiration from planting to the first killing frost ranged from 32.8 to 38.0 cm and from 42.3 to 46.2 cm for 1964 and 1965”

✓ located verbatim in the source · abstract, characters 184–314 · show in text ↑

density · physiology: water · Glycine max (soybean)Results agree

2 papers: 0 positive, 2 negative or no effect

1 paper in the same direction as this paper

  1. no effect
See all 2 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.