Abstract
A dwarf spring wheat (Triticum aestivum ‘Yecora 70’) was grown under irrigation and optimal agronomy in northwest Mexico during four winter seasons. Single shading treatments of approximately four (1971, 1972), three (1973), and two (1974) weeks duration and various intensities were used to elucidate the importance for grain yield of radiation and crop photosynthesis at different stages of development. Shading always reduced crop growth, approximately in direct proportion to the reduction in radiation. Grain yield reduction was however curvilinearly related to radiation such that small reductions had little effect on yield at any developmental stage. Yield reductions with heavier shading only occurred with shading after about 60 days after seeding and were greater before anthesis (90 days) than after anthesis, especially in 1973. The shorter shading treatments indicated that the period of rapid spike growth, approximately 35 to 5 days before anthesis, was that showing greatest sensitivity to shading. Shading then led to fewer spikes/m 2 (lower tiller survival) and fewer grains/splkelet (fewer florets produced), hence reduced grains/m 2 Responses to post‐anthesis shading suggest that the degree of yield limitation by post‐anthesis photosynthesis is not constant for a given genotype, varying substantially from year to year. Thus in 1973 immediate pre‐anthesis conditions were unfavorable due to cloudiness, grains/m 2 was low, and yield was entirely limited by this factor. In other years, yield was more sensitive to post‐anthesis shading. However it is concluded that grains/m 2 , hence crop photosynthesis in the immediate pre‐anthesis period, is the key to higher yield in this cultivar.
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Claims 11
Claim · model-written summary
Shading reduced crop growth in approximately direct proportion to the reduction in radiation.
- Taxon
- Triticum aestivum
Triticum aestivume0 - Material
- Yecora 70e0
- Treatment
- Shadinge1
- Outcome
- crop growthe1
- Direction
- reducede1
- Qualifier
- approximately in direct proportion to the reduction in radiatione1
- Setting
- northwest Mexicoe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A dwarf spring wheat (Triticum aestivum ‘Yecora 70’) was grown under irrigation and optimal agronomy in northwest Mexico during four winter seasons”
e1“Shading always reduced crop growth, approximately in direct proportion to the reduction in radiation”
Claim · model-written summary
Small reductions in radiation had little effect on grain yield.
- Taxon
- Triticum aestivumTriticum aestivume0
- Material
- Yecora 70e0
- Treatment
- radiatione2
- Outcome
- grain yielde2
- Direction
- no_changeinferrede2
- Setting
- northwest Mexicoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A dwarf spring wheat (Triticum aestivum ‘Yecora 70’) was grown under irrigation and optimal agronomy in northwest Mexico during four winter seasons”
e2“Grain yield reduction was however curvilinearly related to radiation such that small reductions had little effect on yield at any developmental stage”
Claim · model-written summary
Yield reductions from heavier shading occurred only with shading after about 60 days after seeding and were greater before anthesis than after anthesis.
- Taxon
- Triticum aestivumTriticum aestivume0
- Material
- Yecora 70e0
- Treatment
- heavier shadinge3
- Outcome
- Yield reductionse3
- Direction
- greatere3
- Qualifier
- only occurred with shading after about 60 days after seedinge3
- Comparator
- after anthesise3
- Setting
- northwest Mexicoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A dwarf spring wheat (Triticum aestivum ‘Yecora 70’) was grown under irrigation and optimal agronomy in northwest Mexico during four winter seasons”
e3“Yield reductions with heavier shading only occurred with shading after about 60 days after seeding and were greater before anthesis (90 days) than after anthesis, especially in 1973”
Claim · model-written summary
The period of rapid spike growth, about 35 to 5 days before anthesis, was the most sensitive period to shading.
- Taxon
- Triticum aestivumTriticum aestivume0
- Material
- Yecora 70e0
- Organ / stage
- rapid spike growthe4
- Treatment
- shorter shading treatmentse4
- Outcome
- sensitivity to shadinge4
- Direction
- greateste4
- Qualifier
- approximately 35 to 5 days before anthesise4
- Setting
- northwest Mexicoe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A dwarf spring wheat (Triticum aestivum ‘Yecora 70’) was grown under irrigation and optimal agronomy in northwest Mexico during four winter seasons”
e4“The shorter shading treatments indicated that the period of rapid spike growth, approximately 35 to 5 days before anthesis, was that showing greatest sensitivity to shading”
Claim · model-written summary
Shading led to fewer spikes per square metre due to lower tiller survival.
- Taxon
- Triticum aestivumTriticum aestivume0
- Material
- Yecora 70e0
- Treatment
- Shadinge5
- Outcome
- spikes/m 2e5
- Direction
- fewere5
- Setting
- northwest Mexicoe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A dwarf spring wheat (Triticum aestivum ‘Yecora 70’) was grown under irrigation and optimal agronomy in northwest Mexico during four winter seasons”
e5“Shading then led to fewer spikes/m 2 (lower tiller survival) and fewer grains/splkelet (fewer florets produced), hence reduced grains/m 2”
Claim · model-written summary
Shading led to fewer grains per spikelet.
- Taxon
- Triticum aestivumTriticum aestivume0
- Material
- Yecora 70e0
- Treatment
- Shadinge5
- Outcome
- grains/splkelete5
- Direction
- fewere5
- Setting
- northwest Mexicoe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A dwarf spring wheat (Triticum aestivum ‘Yecora 70’) was grown under irrigation and optimal agronomy in northwest Mexico during four winter seasons”
e5“Shading then led to fewer spikes/m 2 (lower tiller survival) and fewer grains/splkelet (fewer florets produced), hence reduced grains/m 2”
Claim · model-written summary
Shading reduced grains per square metre.
- Taxon
- Triticum aestivumTriticum aestivume0
- Material
- Yecora 70e0
- Treatment
- Shadinge5
- Outcome
- grains/m 2e5
- Direction
- reducede5
- Setting
- northwest Mexicoe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A dwarf spring wheat (Triticum aestivum ‘Yecora 70’) was grown under irrigation and optimal agronomy in northwest Mexico during four winter seasons”
e5“Shading then led to fewer spikes/m 2 (lower tiller survival) and fewer grains/splkelet (fewer florets produced), hence reduced grains/m 2”
Claim · model-written summary
The degree of yield limitation by post-anthesis photosynthesis was not constant for a given genotype and varied substantially from year to year.
- Taxon
- Triticum aestivumTriticum aestivume0
- Material
- Yecora 70e0
- Outcome
- degree of yield limitatione6
- Qualifier
- not constant for a given genotype, varying substantially from year to yeare6
- Setting
- northwest Mexicoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A dwarf spring wheat (Triticum aestivum ‘Yecora 70’) was grown under irrigation and optimal agronomy in northwest Mexico during four winter seasons”
e6“the degree of yield limitation by post‐anthesis photosynthesis is not constant for a given genotype, varying substantially from year to year”
Claim · model-written summary
In 1973, grains per square metre were low under unfavourable cloudy pre-anthesis conditions and yield was entirely limited by this factor.
- Taxon
- Triticum aestivumTriticum aestivume0
- Material
- Yecora 70e0
- Outcome
- grains/m 2 was lowe7
- Qualifier
- yield was entirely limited by this factore7
- Setting
- northwest Mexicoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A dwarf spring wheat (Triticum aestivum ‘Yecora 70’) was grown under irrigation and optimal agronomy in northwest Mexico during four winter seasons”
e7“grains/m 2 was low, and yield was entirely limited by this factor”
Claim · model-written summary
Yield was more sensitive to post-anthesis shading in other years.
- Taxon
- Triticum aestivumTriticum aestivume0
- Material
- Yecora 70e0
- Treatment
- shadinge6
- Outcome
- yielde6
- Direction
- more sensitivee6
- Setting
- northwest Mexicoe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A dwarf spring wheat (Triticum aestivum ‘Yecora 70’) was grown under irrigation and optimal agronomy in northwest Mexico during four winter seasons”
e6“In other years, yield was more sensitive to post‐anthesis shading”
Claim · model-written summary
Grains per square metre and crop photosynthesis in the immediate pre-anthesis period are the key to higher yield in this cultivar.
- Taxon
- Triticum aestivumTriticum aestivume0
- Material
- Yecora 70e0
- Outcome
- higher yielde7
- Qualifier
- grains/m 2 , hence crop photosynthesis in the immediate pre‐anthesis periode7
- Setting
- northwest Mexicoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A dwarf spring wheat (Triticum aestivum ‘Yecora 70’) was grown under irrigation and optimal agronomy in northwest Mexico during four winter seasons”
e7“it is concluded that grains/m 2 , hence crop photosynthesis in the immediate pre‐anthesis period, is the key to higher yield in this cultivar”
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See all 69 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.