Abstract
Root-zone salinity reduces the grain yield of spring wheat mainly by preventing the initiation and growth ofplant tillers. A counter practice might be to multiply the number of plants grown per unit area, thereby, increasing thenumber of more resistant mainstems. A spring wheat cultivar (Katepwa) was seeded in large greenhouse sand tanks andwatered with hydroponic solutions containing Na and Ca solutes in treatments of 2, 4, 6, 9, 12, and 16 dS/m. Seedingdensities equalled 100, 232 and 344 seeds/m2, the numbers necessary to achieve below, at, and above normal plantdensities for dryland wheat production. The average number of plants harvested per m2 across all salinities equalled97.6, 225.8, and 331.3/m2, respectively, resulting in a mean correlation coefficient of 0.998. Grain yields averaged for all salinity levels except one increased significantly with all increasing seeding densities atp = 0.10, but were only significant between the below-to-normal seedings at p = 0.05. Progressively greater salinitysignificantly reduced biomass, grain yield, and spikes per m2, but not the number of plants/m2. The number of spikes andthe grain yield per plant also decreased significantly, but not the grain per spike; the harvest index even grew slightly assalinity increased. The results showed that the increases above the normal Katepwa wheat population that would be necessary in order tooffset reductions in grain yield caused by salinity could be logarithmically governed. Consequently, to be effective, plantdensities would have to increase to such numbers that water requirements in non-irrigated, semiarid climates will stilllikely limit production during most years. Crowding multi-tillering Katepwa wheat plants appear to offer only limitedhope for compensating grain losses caused by salinity.
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Claims 11
Claim · model-written summary
Harvested plant density closely tracked seeding density.
- Taxon
- spring wheat
Triticum aestivumt0 - Outcome
- number of plants harvested per m2e0
- Value
- 0.998e0
- Qualifier
- across all salinitiese0
Not reportedTreatmentSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average number of plants harvested per m2 across all salinities equalled97.6, 225.8, and 331.3/m2, respectively, resulting in a mean correlation coefficient of 0.998.”
t0“SPRING WHEAT”
Claim · model-written summary
Grain yield increased significantly with rising seeding density at p = 0.10.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- increasing seeding densitiese0
- Outcome
- Grain yieldse0
- Direction
- increasede0
- Qualifier
- all salinity levels except onee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields averaged for all salinity levels except one increased significantly with all increasing seeding densities atp = 0.10”
t0“SPRING WHEAT”
Claim · model-written summary
Salinity significantly reduced biomass.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- Progressively greater salinitye0
- Outcome
- biomasse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Progressively greater salinitysignificantly reduced biomass, grain yield, and spikes per m2”
t0“SPRING WHEAT”
Claim · model-written summary
Salinity significantly reduced grain yield.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- Progressively greater salinitye0
- Outcome
- grain yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Progressively greater salinitysignificantly reduced biomass, grain yield, and spikes per m2”
t0“SPRING WHEAT”
Claim · model-written summary
Salinity significantly reduced spikes per square metre.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- Progressively greater salinitye0
- Outcome
- spikes per m2e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Progressively greater salinitysignificantly reduced biomass, grain yield, and spikes per m2”
t0“SPRING WHEAT”
Claim · model-written summary
Salinity did not significantly alter plants per square metre.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- salinitye1
- Outcome
- number of plants/m2e0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not the number of plants/m2”
t0“SPRING WHEAT”
e1“Grain yields averaged for all salinity levels except one increased significantly with all increasing seeding densities atp = 0.10”
Claim · model-written summary
Spikes per plant significantly decreased with salinity.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- salinitye1
- Outcome
- number of spikese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of spikes andthe grain yield per plant also decreased significantly”
t0“SPRING WHEAT”
e1“Grain yields averaged for all salinity levels except one increased significantly with all increasing seeding densities atp = 0.10”
Claim · model-written summary
Grain yield per plant significantly decreased with salinity.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- salinitye1
- Outcome
- grain yield per plante0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of spikes andthe grain yield per plant also decreased significantly”
t0“SPRING WHEAT”
e1“Grain yields averaged for all salinity levels except one increased significantly with all increasing seeding densities atp = 0.10”
Claim · model-written summary
Grain per spike did not significantly decline with salinity.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- salinitye1
- Outcome
- grain per spikee0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not the grain per spike”
t0“SPRING WHEAT”
e1“Grain yields averaged for all salinity levels except one increased significantly with all increasing seeding densities atp = 0.10”
Claim · model-written summary
Harvest index rose slightly as salinity increased.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- salinitye0
- Outcome
- harvest indexe0
- Direction
- grew slightlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the harvest index even grew slightly assalinity increased”
t0“SPRING WHEAT”
Claim · model-written summary
The authors concluded that crowding Katepwa wheat offers limited scope to offset salinity grain losses.
Verbatim
e0“Crowding multi-tillering Katepwa wheat plants appear to offer only limitedhope for compensating grain losses caused by salinity.”
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See all 498 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.