Abstract
Abstract Aspects of intensive management practices such as high N fertilization inputs and plant growth regulator use could potentially increase cereal yields in regions with a short crop‐growing season and occasionally dry and hot weather. A field experiment was carried out for four years (1987 to 1990) at Agronomy Research Centre of McGill University, Canada to evaluate the response of spring barley ( Hordeum vulgare L.) cv. Cadette, Laurier and Leger to N rates (0, 70 and 140 kg N ha −1 ) and ethephon (2‐chloroethyl phosphonic acid) growth regulator treatment. The application of higher than conventional N level (70 kg N ha −1 ) did not increase barley yields under dry weather conditions and when the soil N resources were high. The high levels of N did increase the grain crude protein concentration by 2 to 10 g kg −1 , as did ethephon treatment. The feed quality of spring barley was improved. Ethephon treatment reduced grain yield due to a severe reduction in the number of grains spike −1 , and/or 1000‐grain weight, although the number of spikes m −2 was increased. Thus, the overall effect of ethephon treatment on yield was inconsistent and was influenced to a large extent by the prevailing weather conditions.
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Claims 9
Claim · model-written summary
Higher than conventional nitrogen did not increase barley yield under dry weather and high soil nitrogen.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- higher than conventional N level (70 kg N ha −1 )e0
- Outcome
- barley yieldse0
- Direction
- did not increasee0
- Qualifier
- under dry weather conditions and when the soil N resources were highe0
- Comparator
- conventional N level (70 kg N ha −1 )e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The application of higher than conventional N level (70 kg N ha −1 ) did not increase barley yields under dry weather conditions and when the soil N resources were high”
Claim · model-written summary
High nitrogen increased grain crude protein concentration by 2 to 10 g kg −1.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- high levels of Ne0
- Outcome
- grain crude protein concentratione0
- Direction
- increasee0
- Value
- 2 to 10 g kg −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high levels of N did increase the grain crude protein concentration by 2 to 10 g kg −1”
t0“Barley”
Claim · model-written summary
Ethephon increased grain crude protein concentration.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- ethephon treatmente0
- Outcome
- grain crude protein concentratione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high levels of N did increase the grain crude protein concentration by 2 to 10 g kg −1 , as did ethephon treatment”
t0“Barley”
Claim · model-written summary
The treatments improved feed quality of spring barley.
- Taxon
- spring barleyHordeum vulgaree0
- Outcome
- feed qualitye0
- Direction
- improvede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The feed quality of spring barley was improved”
Claim · model-written summary
Ethephon reduced barley grain yield.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- Ethephon treatmente0
- Outcome
- grain yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethephon treatment reduced grain yield due to a severe reduction in the number of grains spike −1 , and/or 1000‐grain weight, although the number of spikes m −2 was increased”
t0“Barley”
Claim · model-written summary
Ethephon reduced grains per spike.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- Ethephon treatmente0
- Outcome
- number of grains spike −1e0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethephon treatment reduced grain yield due to a severe reduction in the number of grains spike −1 , and/or 1000‐grain weight, although the number of spikes m −2 was increased”
t0“Barley”
Claim · model-written summary
Ethephon reduced thousand-grain weight.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- Ethephon treatmente0
- Outcome
- 1000‐grain weighte0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethephon treatment reduced grain yield due to a severe reduction in the number of grains spike −1 , and/or 1000‐grain weight, although the number of spikes m −2 was increased”
t0“Barley”
Claim · model-written summary
Ethephon increased spikes per square metre.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- Ethephon treatmente0
- Outcome
- number of spikes m −2e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethephon treatment reduced grain yield due to a severe reduction in the number of grains spike −1 , and/or 1000‐grain weight, although the number of spikes m −2 was increased”
t0“Barley”
Claim · model-written summary
The yield effect of ethephon varied with weather conditions.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- ethephon treatmente0
- Outcome
- yielde0
- Qualifier
- prevailing weather conditionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the overall effect of ethephon treatment on yield was inconsistent and was influenced to a large extent by the prevailing weather conditions”
t0“Barley”
The same questions in other papers
(2-chloroethyl)phosphonic acid · quality: protein · Hordeum vulgare (barley)Results differ
3 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
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See all 6 papers →(2-chloroethyl)phosphonic acid · yield · Hordeum vulgare (barley)Results differ
21 papers in the same direction as this paper · 9 in the opposite direction
- negative
- negative
- positive
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See all 31 papers →nitrogen · yield · Hordeum vulgare (barley)Positive and negative results
46 papers in the same direction as this paper · 252 reporting no difference from an alternative
- positive
- positive
- positive
295 papers more in this group
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.