Abstract
We grew 27 oat cultivars at 3 levels of soil nitrogen, 4 levels of soil phosphorus, and 3 planting dates to examine the reactions of several agronomic characters to degrees of environmental stress. Each environmental factor was varied in a separate experiment. The experiments were grown in split‐plot designs in which wholeplots were levels of the environmental variables and subplots the cultivars planted in hills spaced 1 foot apart in perpendicular directions. The degree of stress imposed by a certain level of environmental factor was measured by the relative productivity of the attribute in question. For most attributes, stress was reduced with increasing increments of nitrogen and phosphorus and with earlier plantings. However, adding nitrogen increments increased the stress for 100‐seed weights, and early planting increased stress for number of spikelets per panicles and 100‐seed weights. Intraplant competitive, caused by the increased numbers of panicles produced per plot when nitrogen was applied or the oats were planted earlier, may have induced stress on spikelet and seed development. In general, genotypic variances among the oat cultivars increased as the environmental stresses were reduced. Environmental variance, however, also tended to increase so that heritabilities did not always increase with reduced environmental stress.
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Claims 8
Claim · model-written summary
For most oat attributes, stress was reduced with increasing nitrogen and phosphorus increments and with earlier planting.
- Taxon
- oat
Avena sativae0 - Treatment
- increasing increments of nitrogen and phosphorus and with earlier plantingse1
- Outcome
- stresse1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“27 oat cultivars”
e1“For most attributes, stress was reduced with increasing increments of nitrogen and phosphorus and with earlier plantings”
Claim · model-written summary
Adding nitrogen increments increased stress for 100-seed weight in oat.
- Taxon
- oatAvena sativae0
- Treatment
- adding nitrogen incrementse2
- Outcome
- stress for 100‐seed weightse2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“27 oat cultivars”
e2“adding nitrogen increments increased the stress for 100‐seed weights”
Claim · model-written summary
Early planting increased stress for the number of spikelets per panicle in oat.
- Taxon
- oatAvena sativae0
- Treatment
- early plantinge3
- Outcome
- stress for number of spikelets per paniclese3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“27 oat cultivars”
e3“early planting increased stress for number of spikelets per panicles and 100‐seed weights”
Claim · model-written summary
Early planting increased stress for 100-seed weight in oat.
- Taxon
- oatAvena sativae0
- Treatment
- early plantinge3
- Outcome
- stress for 100‐seed weightse2
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“27 oat cultivars”
e2“adding nitrogen increments increased the stress for 100‐seed weights”
e3“early planting increased stress for number of spikelets per panicles and 100‐seed weights”
Claim · model-written summary
Intraplant competition may have induced stress on spikelet and seed development in oat when nitrogen was applied or planting was earlier.
- Taxon
- oatAvena sativae0
- Organ / stage
- spikelet and seed developmente4
- Treatment
- when nitrogen was applied or the oats were planted earliere4
- Outcome
- stress on spikelet and seed developmente4
- Qualifier
- Intraplant competitivee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“27 oat cultivars”
e4“Intraplant competitive, caused by the increased numbers of panicles produced per plot when nitrogen was applied or the oats were planted earlier, may have induced stress on spikelet and seed development”
Claim · model-written summary
Genotypic variances among oat cultivars increased as environmental stresses were reduced.
- Taxon
- oatAvena sativae0
- Treatment
- environmental stresses were reducede5
- Outcome
- genotypic variancese5
- Direction
- increasede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“27 oat cultivars”
e5“In general, genotypic variances among the oat cultivars increased as the environmental stresses were reduced”
Claim · model-written summary
Environmental variance tended to increase as environmental stress was reduced in oat.
- Taxon
- oatAvena sativae0
- Treatment
- reduced environmental stresse6
- Outcome
- Environmental variancee6
- Direction
- tended to increasee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“27 oat cultivars”
e6“Environmental variance, however, also tended to increase so that heritabilities did not always increase with reduced environmental stress”
Claim · model-written summary
Heritabilities did not always increase with reduced environmental stress in oat.
- Taxon
- oatAvena sativae0
- Treatment
- reduced environmental stresse6
- Outcome
- heritabilitiese6
- Direction
- did not always increasee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“27 oat cultivars”
e6“Environmental variance, however, also tended to increase so that heritabilities did not always increase with reduced environmental stress”
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