Abstract
Abstract In trials conducted at two highland Vertisol sites in Ethiopia in 1990 and 1991, two locally popular spring bread wheat (Triticum aestivum L.) and durum (T. durum Desf.) cultivars were supplied with nitrogen (N) fertilizer at 0, 60, and 120 kg N/ha in the form of large granular urea (LGU), standard urea prills, or ammonium sulfate. Nitrogen was applied all at sowing, all at mid‐tillering, or split‐applied between these two stages (1/3:2/3). Bread wheat exhibited the highest productivity and was the most responsive to applied N. Grain and biomass yields and most grain yield components were positively affected by increasing N rate and yield responses in each site‐season were economic up to the highest rate of N used in this study. Split application of N had a favorable effect on grain yield as did the use of LGU as the N source, particularly under conditions of severe water‐logging and at the high N rate. Split applications of N tended to nullify the positive effects of LGU, presumably by approximating the delayed release of N achieved with LGU. Grain yield was closely related to the number of grains/m2 and grains/spike.
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Claims 10
Claim · model-written summary
Bread wheat had the highest productivity among the wheat types tested.
- Taxon
- Bread wheat
Triticum aestivume1 - Outcome
- productivitye1
- Direction
- higheste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Bread wheat exhibited the highest productivity”
Claim · model-written summary
Bread wheat was the most responsive to applied N.
- Taxon
- Bread wheatTriticum aestivume1
- Outcome
- responsive to applied Ne2
- Direction
- most responsivee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Bread wheat exhibited the highest productivity”
e2“was the most responsive to applied N”
Claim · model-written summary
Increasing N rate positively affected grain and biomass yields.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- increasing N ratee3
- Outcome
- Grain and biomass yieldse3
- Direction
- positivelye3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Grain and biomass yields and most grain yield components were positively affected by increasing N rate”
t0“bread and durum wheat”
Claim · model-written summary
Increasing N rate positively affected most grain yield components.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- increasing N ratee3
- Outcome
- grain yield componentse3
- Direction
- positivelye3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Grain and biomass yields and most grain yield components were positively affected by increasing N rate”
t0“bread and durum wheat”
Claim · model-written summary
Split application of N had a favorable effect on grain yield.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Split application of Ne4
- Outcome
- grain yielde4
- Direction
- favorable effecte4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Split application of N had a favorable effect on grain yield as did the use of LGU as the N source, particularly under conditions of severe water-logging and at the high N rate”
t0“bread and durum wheat”
Claim · model-written summary
Use of LGU as the N source had a favorable effect on grain yield, particularly under severe water-logging and at the high N rate.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- use of LGU as the N sourcee4
- Outcome
- grain yielde4
- Direction
- favorable effecte4
- Qualifier
- particularly under conditions of severe water-logging and at the high N ratee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Split application of N had a favorable effect on grain yield as did the use of LGU as the N source, particularly under conditions of severe water-logging and at the high N rate”
t0“bread and durum wheat”
Claim · model-written summary
Split applications of N tended to nullify the positive effects of LGU.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Split applications of Ne5
- Outcome
- positive effects of LGUe5
- Direction
- nullifye5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Split applications of N tended to nullify the positive effects of LGU, presumably by approximating the delayed release of N achieved with LGU”
t0“bread and durum wheat”
Claim · model-written summary
Split application approximates the delayed release of N achieved with LGU, presumably explaining the nullified LGU effect.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Split applications of Ne5
- Outcome
- positive effects of LGUe5
- Qualifier
- approximating the delayed release of N achieved with LGUe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Split applications of N tended to nullify the positive effects of LGU, presumably by approximating the delayed release of N achieved with LGU”
t0“bread and durum wheat”
Claim · model-written summary
Grain yield was closely related to the number of grains per square metre and grains per spike.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- number of grains/m2 and grains/spikee6
- Outcome
- Grain yielde6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Grain yield was closely related to the number of grains/m2 and grains/spike”
t0“bread and durum wheat”
Claim · model-written summary
Yield responses were economic up to the highest N rate used in the study.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- yield responsese7
- Qualifier
- economic up to the highest rate of N used in this studye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“yield responses in each site‐season were economic up to the highest rate of N used in this study”
t0“bread and durum wheat”
The same questions in other papers
nitrogen · yield · Triticum aestivum (wheat)Positive and negative results
1,736 papers in the same direction as this paper · 285 in the opposite direction · 39 reporting no difference from an alternative
- no effect
- positive
- positive
2,057 papers more in this group
See all 2,061 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.