Abstract
SUMMARY Two barley experiments are described in which a range of plant populations were shaded during different periods of development. Shading during the ear development period caused considerable reductions in grain yield, largely by reducing the number of grains per ear. Shading during the grain-filling period caused no reduction in grain yield. It is suggested that under conditions of these experiments there was probably a potential surplus of carbohydrate available for grain filling and that grain yield was largely determined by the storage capacity of the ears. The importance of the number of grains per ear as an indicator of individual ear capacity is emphasized. The effects of plant population on grain yield and its components are also examined. It is concluded that the number of grains per ear is the component having greatest influence on the decrease in grain yield at above-optimum populations and attention is again drawn to the possible importance of ear capacity. It is argued that on an area basis the number of grains per unit area may give a good indication of ear capacity. Examination of this parameter shows a close relationship with grain yield per unit area for both the shading and population treatments. It is particularly evident that a decrease in grain yield at high populations was associated with a comparable decrease in the number of grains per unit area. It is suggested that this decrease in grain number may be due to a lower production of total dry matter during ear development rather than an unfavourable partitioning of this dry matter between the ear and the rest of the plant. This lower production of total dry matter is attributed to the crop growth rates of the higher populations having reached their peak and then having declined before the end of the ear development period. This crop growth rate pattern, through its effect on grain number per unit area, is put forward as the basic reason why, in the final crop, grain yield per unit area decreases at above-optimum populations.
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Claims 10
Claim · model-written summary
Shading during the ear development period caused considerable reductions in grain yield in barley.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Organ / stage
- ear development periode1
- Treatment
- Shading during the ear development periode1
- Outcome
- grain yielde1
- Direction
- reductionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“barley”
e1“Shading during the ear development period caused considerable reductions in grain yield, largely by reducing the number of grains per ear”
Claim · model-written summary
Shading during the ear development period reduced the number of grains per ear in barley.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- ear development periode1
- Treatment
- Shading during the ear development periode1
- Outcome
- number of grains per eare1
- Direction
- reducinge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e1“Shading during the ear development period caused considerable reductions in grain yield, largely by reducing the number of grains per ear”
Claim · model-written summary
Shading during the grain-filling period caused no reduction in barley grain yield.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- grain-filling periode1
- Treatment
- Shading during the grain-filling periode1
- Outcome
- grain yielde1
- Direction
- no reductione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e1“Shading during the grain-filling period caused no reduction in grain yield”
Claim · model-written summary
At above-optimum populations, the number of grains per ear has the greatest influence on the decrease in barley grain yield.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- above-optimum populationse1
- Outcome
- decrease in grain yielde1
- Direction
- decreasee1
- Qualifier
- the number of grains per ear is the component having greatest influencee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e1“It is concluded that the number of grains per ear is the component having greatest influence on the decrease in grain yield at above-optimum populations”
Claim · model-written summary
At high populations, the decrease in barley grain yield was accompanied by a comparable decrease in grains per unit area.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- high populationse1
- Outcome
- number of grains per unit areae1
- Direction
- decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e1“a decrease in grain yield at high populations was associated with a comparable decrease in the number of grains per unit area”
Claim · model-written summary
Grains per unit area show a close positive relationship with grain yield per unit area under both shading and population treatments.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- shading and population treatmentse1
- Outcome
- grain yield per unit areae1
- Direction
- increaseinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e1“Examination of this parameter shows a close relationship with grain yield per unit area for both the shading and population treatments”
Claim · model-written summary
The decrease in grain number may be due to lower total dry matter production during ear development rather than unfavourable partitioning.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- decrease in grain numbere1
- Qualifier
- a lower production of total dry matter during ear developmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e1“It is suggested that this decrease in grain number may be due to a lower production of total dry matter during ear development rather than an unfavourable partitioning”
Claim · model-written summary
Lower total dry matter production is attributed to higher populations reaching peak crop growth rate and then declining before the end of ear development.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- ear development periode1
- Outcome
- lower production of total dry mattere1
- Qualifier
- the crop growth rates of the higher populations having reached their peak and then having declinede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e1“This lower production of total dry matter is attributed to the crop growth rates of the higher populations having reached their peak and then having declined before the end of the ear development period”
Claim · model-written summary
The crop growth rate pattern, through its effect on grain number per unit area, is the basic reason grain yield per unit area decreases at above-optimum populations.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- above-optimum populationse1
- Outcome
- grain yield per unit areae1
- Qualifier
- crop growth rate pattern, through its effect on grain number per unit areae1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e1“This crop growth rate pattern, through its effect on grain number per unit area, is put forward as the basic reason why, in the final crop, grain yield per unit area decreases at above-optimum populations”
Claim · model-written summary
Grain yield is suggested to be largely determined by the storage capacity of the ears, with a probable surplus of carbohydrate for grain filling.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- earse1
- Outcome
- grain yielde1
- Qualifier
- potential surplus of carbohydrate available for grain fillinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e1“It is suggested that under conditions of these experiments there was probably a potential surplus of carbohydrate available for grain filling and that grain yield was largely determined by the storage capacity of the ears”
The same questions in other papers
shade · yield · Hordeum vulgare (barley)Results differ
10 papers in the same direction as this paper · 3 in the opposite direction
- negative
- positive
- positive
10 papers more in this group
See all 14 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.