Abstract
ABSTRACT The objective of this study was to evaluate the effect of nitrogen (N) and trinexapac-ethyl (TE) rates on the SPAD index in wheat flag leaf. The treatments were five N rates (30, 60, 90, 120, 150 kg ha−1) combined with four TE rates (0, 63, 125, 188 g ha−1). The experiment was carried out in a randomized block design with four repetitions. SPAD index, leaf N content and grain yield showed quadratic response to the increase in N rates, whereas area, wet and dry weight of flag leaf presented linear increase. TE caused linear increase in SPAD index, linear decrease in leaf area, reduction in grain yield with smaller N rates and increase with larger N rates. The N content, and the wet and dry weight of flag leaf were not affected by TE. SPAD calibration to estimate N status in wheat should be specific for each TE rate.
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Claims 8
Claim · model-written summary
SPAD index, leaf N content and grain yield showed a quadratic response to increasing N rates.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- N ratese2
- Outcome
- SPAD index, leaf N content and grain yielde2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“evaluate the effect of nitrogen (N) and trinexapac-ethyl (TE) rates on the SPAD index in wheat flag leaf”
e2“SPAD index, leaf N content and grain yield showed quadratic response to the increase in N rates, whereas area, wet and dry weight of flag leaf presented linear increase”
Claim · model-written summary
Flag-leaf area, wet weight and dry weight increased linearly with N rates.
- Taxon
- wheatTriticum aestivume1
- Treatment
- N ratese2
- Outcome
- area, wet and dry weight of flag leafe2
- Direction
- linear increasee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“evaluate the effect of nitrogen (N) and trinexapac-ethyl (TE) rates on the SPAD index in wheat flag leaf”
e2“SPAD index, leaf N content and grain yield showed quadratic response to the increase in N rates, whereas area, wet and dry weight of flag leaf presented linear increase”
Claim · model-written summary
Trinexapac-ethyl caused a linear increase in SPAD index.
- Taxon
- wheatTriticum aestivume1
- Treatment
- TEe3
- Outcome
- SPAD indexe3
- Direction
- linear increasee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“evaluate the effect of nitrogen (N) and trinexapac-ethyl (TE) rates on the SPAD index in wheat flag leaf”
e3“TE caused linear increase in SPAD index, linear decrease in leaf area, reduction in grain yield with smaller N rates and increase with larger N rates”
Claim · model-written summary
Trinexapac-ethyl caused a linear decrease in leaf area.
- Taxon
- wheatTriticum aestivume1
- Treatment
- TEe3
- Outcome
- leaf areae3
- Direction
- linear decreasee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“evaluate the effect of nitrogen (N) and trinexapac-ethyl (TE) rates on the SPAD index in wheat flag leaf”
e3“TE caused linear increase in SPAD index, linear decrease in leaf area, reduction in grain yield with smaller N rates and increase with larger N rates”
Claim · model-written summary
Trinexapac-ethyl reduced grain yield at smaller N rates.
- Taxon
- wheatTriticum aestivume1
- Treatment
- TEe3
- Outcome
- grain yielde3
- Direction
- reductione3
- Qualifier
- with smaller N ratese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“evaluate the effect of nitrogen (N) and trinexapac-ethyl (TE) rates on the SPAD index in wheat flag leaf”
e3“TE caused linear increase in SPAD index, linear decrease in leaf area, reduction in grain yield with smaller N rates and increase with larger N rates”
Claim · model-written summary
Trinexapac-ethyl increased grain yield at larger N rates.
- Taxon
- wheatTriticum aestivume1
- Treatment
- TEe3
- Outcome
- grain yielde3
- Direction
- increasee3
- Qualifier
- with larger N ratese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“evaluate the effect of nitrogen (N) and trinexapac-ethyl (TE) rates on the SPAD index in wheat flag leaf”
e3“TE caused linear increase in SPAD index, linear decrease in leaf area, reduction in grain yield with smaller N rates and increase with larger N rates”
Claim · model-written summary
Trinexapac-ethyl did not change leaf N content or the wet and dry weight of the flag leaf.
- Taxon
- wheatTriticum aestivume1
- Treatment
- TEe4
- Outcome
- N content, and the wet and dry weight of flag leafe4
- Direction
- no_changeinferrede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“evaluate the effect of nitrogen (N) and trinexapac-ethyl (TE) rates on the SPAD index in wheat flag leaf”
e4“The N content, and the wet and dry weight of flag leaf were not affected by TE”
Claim · model-written summary
SPAD calibration to estimate N status in wheat should be specific for each trinexapac-ethyl rate.
- Taxon
- wheatTriticum aestivume5
- Outcome
- SPAD calibration to estimate N statuse5
- Qualifier
- for each TE ratee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“evaluate the effect of nitrogen (N) and trinexapac-ethyl (TE) rates on the SPAD index in wheat flag leaf”
e5“SPAD calibration to estimate N status in wheat should be specific for each TE rate”
The same questions in other papers
trinexapac-ethyl · yield · Triticum aestivum (wheat)Results differ
2 papers in the same direction as this paper · 7 in the opposite direction
- negative
- negative
- negative
6 papers more in this group
See all 10 papers →trinexapac-ethyl · growth · Triticum aestivum (wheat)Positive and negative results
8 papers in the same direction as this paper · 4 in the opposite direction
- positive
- no effect
- positive
9 papers more in this group
See all 13 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.