Abstract
SUMMARY This research was conducted to determine the effects of applying N-fertilizer to standard and semidwarf spring wheat varieties on the components of grain yield, and especially on the ability of tillers to develop and produce ears under semiarid conditions. For two growing seasons at Mandan, North Dakota, tillers were identified and tagged according to the leaf axil from which they originated. The survival and development of these tillers, identified as M, T 1 , T 2 , and T 3 for main stem and tillers from axils of first, second and third true leaves respectively, were observed and measured from emergence to maturity. N-fertilizer was applied at 0, 50 and 270 kg N/ha annually, representing deficient, adequate and excessive N supply. N-fertilizer application increased grain yield of both varieties, with the increase between 50 and 270 kg N/ha being significant for the standard variety only. Most of this response to N resulted from an increase in the number of ears/ha, arising from reduced mortality of tillers, particularly T 2 and T 3 tillers during the latter part of the season when water was limited. For a given variety, grain production by M and by T 1 tillers was seldom affected by N treatment. Although data were analysed by several means, all results indicate that improved N nutrition enables the later-developing tillers to survive and produce ears more competitively. Final grain yield was closely correlated with N content of a given tiller at the tillering stage, and to dry weight of individual tillers at both tillering and heading. Order of tiller had no appreciable effect on N content of grain. The proportion of final grain yield originating from M decreased from about 60% without N to about 36% for 270 kg N/ha, primarily because of increased survival and production from T 2 and T 3 tillers following the application of N-fertilizer.
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Claims 11
Claim · model-written summary
N-fertilizer application increased grain yield of both spring wheat varieties.
- Taxon
- spring wheat
Triticum aestivume0 - Material
- standard and semidwarf spring wheat varietiese0
- Treatment
- N-fertilizer applicatione1
- Outcome
- grain yielde1
- Direction
- increasede1
- Setting
- Mandan, North Dakotae2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“standard and semidwarf spring wheat varieties”
e1“N-fertilizer application increased grain yield of both varieties, with the increase between 50 and 270 kg N/ha being significant for the standard variety only”
e2“For two growing seasons at Mandan, North Dakota”
Claim · model-written summary
Grain yield increase between 50 and 270 kg N/ha was significant for the standard variety only.
- Taxon
- spring wheatTriticum aestivume0
- Material
- standard varietye1
- Treatment
- N-fertilizer applicatione1
- Outcome
- grain yielde1
- Direction
- increasee1
- Qualifier
- between 50 and 270 kg N/hae1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“standard and semidwarf spring wheat varieties”
e1“N-fertilizer application increased grain yield of both varieties, with the increase between 50 and 270 kg N/ha being significant for the standard variety only”
Claim · model-written summary
N increased the number of ears per hectare by reducing tiller mortality.
- Taxon
- spring wheatTriticum aestivume0
- Treatment
- Ne3
- Outcome
- number of ears/hae3
- Direction
- increasee3
- Qualifier
- arising from reduced mortality of tillerse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“standard and semidwarf spring wheat varieties”
e3“Most of this response to N resulted from an increase in the number of ears/ha, arising from reduced mortality of tillers, particularly T 2 and T 3 tillers during the latter part of the season when water was limited”
Claim · model-written summary
N reduced the mortality of T 2 and T 3 tillers.
- Taxon
- spring wheatTriticum aestivume0
- Organ / stage
- T 2 and T 3 tillerse3
- Treatment
- Ne3
- Outcome
- mortality of tillerse3
- Direction
- reducede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“standard and semidwarf spring wheat varieties”
e3“Most of this response to N resulted from an increase in the number of ears/ha, arising from reduced mortality of tillers, particularly T 2 and T 3 tillers during the latter part of the season when water was limited”
Claim · model-written summary
N treatment seldom affected grain production by M and by T 1 tillers.
- Taxon
- spring wheatTriticum aestivume0
- Organ / stage
- M and by T 1 tillerse4
- Treatment
- N treatmente4
- Outcome
- grain productione4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“standard and semidwarf spring wheat varieties”
e4“For a given variety, grain production by M and by T 1 tillers was seldom affected by N treatment”
Claim · model-written summary
Final grain yield was closely correlated with N content of a tiller at the tillering stage.
- Taxon
- spring wheatTriticum aestivume0
- Organ / stage
- tillering stagee5
- Outcome
- Final grain yielde5
- Qualifier
- N content of a given tillere5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“standard and semidwarf spring wheat varieties”
e5“Final grain yield was closely correlated with N content of a given tiller at the tillering stage, and to dry weight of individual tillers at both tillering and heading”
Claim · model-written summary
Final grain yield was correlated with dry weight of individual tillers at tillering and heading.
- Taxon
- spring wheatTriticum aestivume0
- Organ / stage
- tillering and headinge5
- Outcome
- Final grain yielde5
- Qualifier
- dry weight of individual tillerse5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“standard and semidwarf spring wheat varieties”
e5“Final grain yield was closely correlated with N content of a given tiller at the tillering stage, and to dry weight of individual tillers at both tillering and heading”
Claim · model-written summary
Order of tiller had no appreciable effect on N content of grain.
- Taxon
- spring wheatTriticum aestivume0
- Treatment
- Order of tillere6
- Outcome
- N content of graine6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“standard and semidwarf spring wheat varieties”
e6“Order of tiller had no appreciable effect on N content of grain”
Claim · model-written summary
The share of final grain yield from the main stem decreased from about 60% without N to about 36% at 270 kg N/ha.
- Taxon
- spring wheatTriticum aestivume0
- Treatment
- N-fertilizere7
- Outcome
- proportion of final grain yield originating from Me7
- Direction
- decreasede7
- Value
- 36%e7
- Qualifier
- from about 60% without Ne7
- Comparator
- without Ne7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“standard and semidwarf spring wheat varieties”
e7“The proportion of final grain yield originating from M decreased from about 60% without N to about 36% for 270 kg N/ha, primarily because of increased survival and production from T 2 and T 3 tillers following the application of N-fertilizer”
Claim · model-written summary
N-fertilizer increased survival and production of T 2 and T 3 tillers.
- Taxon
- spring wheatTriticum aestivume0
- Organ / stage
- T 2 and T 3 tillerse7
- Treatment
- N-fertilizere7
- Outcome
- survival and production from T 2 and T 3 tillerse7
- Direction
- increasede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“standard and semidwarf spring wheat varieties”
e7“The proportion of final grain yield originating from M decreased from about 60% without N to about 36% for 270 kg N/ha, primarily because of increased survival and production from T 2 and T 3 tillers following the application of N-fertilizer”
Claim · model-written summary
Improved N nutrition enables later-developing tillers to survive and produce ears more competitively.
- Taxon
- spring wheatTriticum aestivume0
- Treatment
- improved N nutritione7
- Outcome
- survive and produce ears more competitivelye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“standard and semidwarf spring wheat varieties”
e7“all results indicate that improved N nutrition enables the later-developing tillers to survive and produce ears more competitively”
The same questions in other papers
nitrogen · pest · Triticum aestivum (wheat)Positive and negative results
38 papers in the same direction as this paper · 12 in the opposite direction · 2 reporting no difference from an alternative
- negative
- negative
- negative
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See all 53 papers →nitrogen · yield · Triticum aestivum (wheat)Positive and negative results
1,736 papers in the same direction as this paper · 285 in the opposite direction · 39 reporting no difference from an alternative
- no effect
- positive
- negative
2,057 papers more in this group
See all 2,061 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.