Abstract
Abstract Nitrogen, equivalent to rates of 45 and 90 kg/ha, applied at emergence, increased the leaf area index of barley 44 and 109%, respectively, before stem elongation. for an 18‐day period before and during tillering, evapotranspiration was 14 and 43% higher with the 45‐ and 90‐kg rates, respectively. During a subsequent 26‐day dry period, available soil water was depleted first at the highest N level. Relative turgidity of barley leaves at the end of the dry period (2 weeks before heading) was 84, 65, and 52% for the 0‐, 45‐, and 90‐kg N rates, respectively. At the high N rate, the number of barley heads per unit land area was reduced 44% and the number of kernels per head, 40%. As a result, barley grain yield was decreased 1,470 kg/ha. In contrast, a yield increase of 450 kg/ha was obtained with the 45‐kg rate of N. These results illutrate how a moderately high rate of N, applied to N‐deficient soil with limited water, can result in severe water stress at a critical growth period and depress grain yield.
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Claims 12
Claim · model-written summary
Nitrogen at 45 kg/ha increased barley leaf area index by 44%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Nitrogen, equivalent to rates of 45 and 90 kg/ha, applied at emergence, increased the leaf area index of barley 44 and 109%, respectively, before stem elongation”
Claim · model-written summary
Nitrogen at 90 kg/ha increased barley leaf area index by 109%.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- 90 kg/hae0
- Outcome
- leaf area indexe0
- Direction
- increasede0
- Value
- 109%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen, equivalent to rates of 45 and 90 kg/ha, applied at emergence, increased the leaf area index of barley 44 and 109%, respectively, before stem elongation”
Claim · model-written summary
Evapotranspiration was 14% higher with 45 kg nitrogen over an 18 day period.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for an 18‐day period before and during tillering, evapotranspiration was 14 and 43% higher with the 45‐ and 90‐kg rates, respectively”
t0“Water Stress of Barley”
Claim · model-written summary
Evapotranspiration was 43% higher with 90 kg nitrogen over an 18 day period.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- 90‐kg ratese0
- Outcome
- evapotranspiratione0
- Direction
- highere0
- Value
- 43%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for an 18‐day period before and during tillering, evapotranspiration was 14 and 43% higher with the 45‐ and 90‐kg rates, respectively”
t0“Water Stress of Barley”
Claim · model-written summary
Available soil water was depleted first at the highest nitrogen level.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- highest N levele0
- Outcome
- available soil watere0
- Direction
- depleted firste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During a subsequent 26‐day dry period, available soil water was depleted first at the highest N level”
t0“Water Stress of Barley”
Claim · model-written summary
Barley relative leaf turgidity was 84% with no nitrogen.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- 0‐e0
- Outcome
- Relative turgiditye0
- Value
- 84e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative turgidity of barley leaves at the end of the dry period (2 weeks before heading) was 84, 65, and 52% for the 0‐, 45‐, and 90‐kg N rates, respectively”
Claim · model-written summary
Barley relative leaf turgidity was 65% with 45 kg nitrogen.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- 45‐e0
- Outcome
- Relative turgiditye0
- Value
- 65e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative turgidity of barley leaves at the end of the dry period (2 weeks before heading) was 84, 65, and 52% for the 0‐, 45‐, and 90‐kg N rates, respectively”
Claim · model-written summary
Barley relative leaf turgidity was 52% with 90 kg nitrogen.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- 90‐kg N ratese0
- Outcome
- Relative turgiditye0
- Value
- 52%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative turgidity of barley leaves at the end of the dry period (2 weeks before heading) was 84, 65, and 52% for the 0‐, 45‐, and 90‐kg N rates, respectively”
Claim · model-written summary
High nitrogen reduced barley head density by 44%.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- high N ratee0
- Outcome
- number of barley heads per unit land areae0
- Direction
- reducede0
- Value
- 44%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the high N rate, the number of barley heads per unit land area was reduced 44% and the number of kernels per head, 40%”
Claim · model-written summary
High nitrogen reduced kernels per barley head by 40%.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- high N ratee0
- Outcome
- number of kernels per heade0
- Direction
- reducede0
- Value
- 40%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the high N rate, the number of barley heads per unit land area was reduced 44% and the number of kernels per head, 40%”
Claim · model-written summary
High nitrogen reduced barley grain yield by 1,470 kg/ha.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- barley grain yielde0
- Direction
- decreasede0
- Value
- 1,470 kg/hae0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As a result, barley grain yield was decreased 1,470 kg/ha”
Claim · model-written summary
The 45 kg nitrogen rate increased barley yield by 450 kg/ha.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- 45‐kg rate of Ne0
- Outcome
- yielde0
- Direction
- increasee0
- Value
- 450 kg/hae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In contrast, a yield increase of 450 kg/ha was obtained with the 45‐kg rate of N”
t0“Water Stress of Barley”
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See all 299 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.