Paper · 1963 · Agronomy Journal

Yield, Percent Nitrogen, and Total Nitrogen Uptake of Various California Annual Grassland Species Fertilized with Increasing Rates of Nitrogen1

Milton B. Jones

6
claims
10
verbatim quotes
15
citations
2
research areas
—
Not open access

Abstract

Synopsis Near maximum yields resulted where 80 pounds N per acre were applied, but carryover was measurable only where 160 pounds were used. In nonleguminous plants, percent N increased with N rates during the vegetative stage, but at maturity it was less where 40 pounds N were applied than in the control. N uptake increased with N rate during winter, but uptake on unfertilized plots during the spring approximated that on plots receiving 40 pounds of N.

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Claims 6

Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

Near maximum yields occurred at 80 pounds N per acre.

Taxon
California Annual Grassland Speciest0
Treatment
80 pounds N per acree0
Outcome
yieldse0
Direction
Near maximume0

Not reportedComparator

Verbatim

e0

“Near maximum yields resulted where 80 pounds N per acre were applied”

✓ located verbatim in the source · abstract, characters 9–77 · show in text ↑
t0

“California Annual Grassland Species”

✓ located verbatim in the source · title, characters 62–97 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

Carryover was measurable only at 160 pounds N.

Taxon
California Annual Grassland Speciest0
Treatment
160 poundse0
Outcome
carryover was measurablee0

Verbatim

e0

“carryover was measurable only where 160 pounds were used”

✓ located verbatim in the source · abstract, characters 83–139 · show in text ↑
t0

“California Annual Grassland Species”

✓ located verbatim in the source · title, characters 62–97 · show in text ↑
Associationobservedoriginal resultmeasured

Claim · model-written summary

Nonleguminous plant nitrogen percentage increased with nitrogen rate in the vegetative stage.

Taxon
nonleguminous plantse0
Organ / stage
vegetative stagee0
Treatment
N ratese0
Outcome
percent Ne0
Direction
increasede0

Verbatim

e0

“In nonleguminous plants, percent N increased with N rates during the vegetative stage”

✓ located verbatim in the source · abstract, characters 141–226 · show in text ↑
Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

At maturity, nitrogen percentage at 40 pounds N was lower than the control.

Taxon
nonleguminous plantse0
Organ / stage
maturitye0
Treatment
40 pounds Ne0
Outcome
percent Ne0
Direction
lesse0
Comparator
the controle0

Verbatim

e0

“In nonleguminous plants, percent N increased with N rates during the vegetative stage, but at maturity it was less where 40 pounds N were applied than in the control”

✓ located verbatim in the source · abstract, characters 141–306 · show in text ↑
Associationobservedoriginal resultmeasured

Claim · model-written summary

Nitrogen uptake increased with nitrogen rate during winter.

Taxon
California Annual Grassland Speciest0
Treatment
N ratee0
Outcome
N uptakee0
Direction
increasede0
Qualifier
wintere0

Verbatim

e0

“N uptake increased with N rate during winter”

✓ located verbatim in the source · abstract, characters 308–352 · show in text ↑
t0

“California Annual Grassland Species”

✓ located verbatim in the source · title, characters 62–97 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

Spring nitrogen uptake on unfertilized plots approximated uptake at 40 pounds N.

Taxon
California Annual Grassland Speciest0
Treatment
unfertilized plotse0
Outcome
uptakee0
Direction
approximatede0
Comparator
plots receiving 40 pounds of Ne0

Verbatim

e0

“uptake on unfertilized plots during the spring approximated that on plots receiving 40 pounds of N”

✓ located verbatim in the source · abstract, characters 358–456 · show in text ↑
t0

“California Annual Grassland Species”

✓ located verbatim in the source · title, characters 62–97 · show in text ↑