Abstract
Abstract Information is lacking on the proportionate mass distribution of dry matter among aerial components of spring wheat ( Triticum aestivum L.) over its life cycle at recognized plant development stages. Benefits of such an assessment would accrue to segments of the agricultural industry and modelers/forecasters of crop development and yield. Measurements of aerial components were made weekly from the three‐leaf to kernel‐hard stage of three spring wheat cultivars grown on Williams loam (fine‐loamy, mixed Typic Argiborolls) with three fertilizer N and three water levels in 1981 and 1982. Relations were determined of total aerial dry mass percent in leaves, stems, and spikes, of tillers per plant, fresh and dry leaf mass, and leaf area index (LAI) to the Haun scale expanded to include grain filling, and, as well, fresh and dry leaf mass to LAI. Development stage accounted for 92,96,85, and 79% of the change in total aerial dry mass and in percent of aerial dry mass in leaves, stems, and spikes, respectively, and 52, 85, 59, and 59% of tillers per plant, LAI, dry leaf mass, and fresh leaf mass, respectively. About 50% of aerial dry mass at flag leaf was distributed in each of leaves and stems, while maximum tiller number occurred one Haun stage earlier, and maximum LAI at boot stage. Water and N variables altered the magnitude of mass change, but did not cause a shift in development stage when maximums occurred. Through flag‐leaf‐extension stage, LAI changed one unit for each increase of 37 and 237 g m −2 of dry and fresh leaf mass, respectively.
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Claims 8
Claim · model-written summary
Development stage accounted for 92% of total aerial dry mass change.
- Taxon
- spring wheat
Triticum aestivume1 - Organ / stage
- Development stagee0
- Outcome
- total aerial dry masse0
Not reportedDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Development stage accounted for 92,96,85, and 79% of the change in total aerial dry mass and in percent of aerial dry mass in leaves, stems, and spikes, respectively”
e1“spring wheat ( Triticum aestivum L.)”
Claim · model-written summary
Development stage accounted for 96%, 85% and 79% of leaf, stem and spike dry mass percentages, respectively.
- Taxon
- spring wheatTriticum aestivume1
- Organ / stage
- Development stagee0
- Outcome
- percent of aerial dry mass in leaves, stems, and spikese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Development stage accounted for 92,96,85, and 79% of the change in total aerial dry mass and in percent of aerial dry mass in leaves, stems, and spikes, respectively”
e1“spring wheat ( Triticum aestivum L.)”
Claim · model-written summary
At flag leaf, about half the aerial dry mass was in leaves and half in stems.
- Taxon
- spring wheatTriticum aestivume1
- Organ / stage
- flag leafe0
- Outcome
- aerial dry masse0
- Value
- 50%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“About 50% of aerial dry mass at flag leaf was distributed in each of leaves and stems”
e1“spring wheat ( Triticum aestivum L.)”
Claim · model-written summary
Maximum tiller number occurred one Haun stage before flag leaf.
- Taxon
- spring wheatTriticum aestivume1
- Outcome
- maximum tiller numbere0
- Value
- one Haun stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum tiller number occurred one Haun stage earlier”
e1“spring wheat ( Triticum aestivum L.)”
Claim · model-written summary
Maximum leaf area index occurred at boot stage.
- Taxon
- spring wheatTriticum aestivume1
- Organ / stage
- boot stagee0
- Outcome
- maximum LAIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum LAI at boot stage”
e1“spring wheat ( Triticum aestivum L.)”
Claim · model-written summary
Water and N altered the magnitude of mass change.
- Taxon
- spring wheatTriticum aestivume1
- Treatment
- Water and N variablese0
- Outcome
- magnitude of mass changee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water and N variables altered the magnitude of mass change”
e1“spring wheat ( Triticum aestivum L.)”
Claim · model-written summary
Water and N did not shift the developmental stage of maxima.
- Taxon
- spring wheatTriticum aestivume1
- Treatment
- Water and N variablese0
- Outcome
- development stage when maximums occurrede0
- Direction
- did not cause a shifte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water and N variables altered the magnitude of mass change, but did not cause a shift in development stage when maximums occurred”
e1“spring wheat ( Triticum aestivum L.)”
Claim · model-written summary
Through flag leaf extension, LAI rose one unit per 37 g m −2 of dry leaf mass.
- Taxon
- spring wheatTriticum aestivume1
- Organ / stage
- flag‐leaf‐extension stagee0
- Outcome
- LAIe0
- Direction
- increasee0
- Value
- 37 and 237 g m −2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Through flag‐leaf‐extension stage, LAI changed one unit for each increase of 37 and 237 g m −2 of dry and fresh leaf mass, respectively”
e1“spring wheat ( Triticum aestivum L.)”