Abstract
SUMMARY Two experiments carried out in 1968 and 1969 are described which examined, through growth and yield analysis, the effect of nitrogen on the growth of oilseed rape. The results of the second experiment, when 0, 105·5 and 211·0 kg N/ha were compared, are presented and discussed. The application of nitrogen increased the yields of seed and oil, principally through increased production of seeds by a larger number of pods. However, the application of nitrogen had little effect on average pod weight or average seed weight. Crop growth rates were increased by the application of nitrogen and reached their highest levels during the period of pod development when the leaf areas had declined to very low levels. The order of effects of nitrogen (N 2 > Nl > NO) was similar for LAI, number of pods per plant and number of seeds per pod and it is likely that the effect of nitrogen was achieved indirectly through an increase in the supply of assimilates to the flowers and young pods. This suggests that the maintenance of a large and photosynthetically efficient leaf area during the period of flowering is necessary for high yields in this crop. The results also suggest that once pods are macroscopic they produce much of the assimilates needed for their own growth. The implications of these findings with regard to both practice and further research are discussed.
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Claims 9
Claim · model-written summary
Nitrogen application increased the yields of seed and oil of oilseed rape.
- Taxon
- oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- application of nitrogene0
- Outcome
- yields of seed and oile0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
t0“yield of oilseed rape”
e0“The application of nitrogen increased the yields of seed and oil, principally through increased production of seeds by a larger number of pods”
Claim · model-written summary
Nitrogen increased seed and oil yield principally through increased seed production from a larger number of pods.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- yields of seed and oile0
- Qualifier
- increased production of seeds by a larger number of podse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of oilseed rape”
e0“The application of nitrogen increased the yields of seed and oil, principally through increased production of seeds by a larger number of pods”
Claim · model-written summary
Nitrogen application had little effect on average pod weight or average seed weight of oilseed rape.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- application of nitrogene1
- Outcome
- average pod weight or average seed weighte1
- Direction
- little effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of oilseed rape”
e1“the application of nitrogen had little effect on average pod weight or average seed weight”
Claim · model-written summary
Nitrogen application increased crop growth rates of oilseed rape.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- application of nitrogene2
- Outcome
- Crop growth ratese2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of oilseed rape”
e2“Crop growth rates were increased by the application of nitrogen and reached their highest levels during the period of pod development when the leaf areas had declined to very low levels”
Claim · model-written summary
Crop growth rates of oilseed rape reached their highest levels during pod development.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- Crop growth ratese2
- Direction
- highest levelse2
- Qualifier
- during the period of pod developmente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of oilseed rape”
e2“Crop growth rates were increased by the application of nitrogen and reached their highest levels during the period of pod development when the leaf areas had declined to very low levels”
Claim · model-written summary
The order of nitrogen effects was similar for LAI, pods per plant and seeds per pod of oilseed rape.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- nitrogene3
- Outcome
- LAI, number of pods per plant and number of seeds per pode3
- Direction
- was similare3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of oilseed rape”
e3“The order of effects of nitrogen (N 2 > Nl > NO) was similar for LAI, number of pods per plant and number of seeds per pod”
Claim · model-written summary
Nitrogen likely acts indirectly, through more assimilate supply to flowers and young pods.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- effect of nitrogene4
- Qualifier
- indirectly through an increase in the supply of assimilates to the flowers and young podse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of oilseed rape”
e4“it is likely that the effect of nitrogen was achieved indirectly through an increase in the supply of assimilates to the flowers and young pods”
Claim · model-written summary
Maintaining a large and photosynthetically efficient leaf area during flowering is necessary for high yields of oilseed rape.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- high yieldse5
- Qualifier
- maintenance of a large and photosynthetically efficient leaf area during the period of floweringe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of oilseed rape”
e5“This suggests that the maintenance of a large and photosynthetically efficient leaf area during the period of flowering is necessary for high yields”
Claim · model-written summary
Once pods are macroscopic they produce much of the assimilates needed for their own growth.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- assimilates needed for their own growthe6
- Direction
- produce much ofe6
- Qualifier
- once pods are macroscopice6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“yield of oilseed rape”
e6“once pods are macroscopic they produce much of the assimilates needed for their own growth”
The same questions in other papers
nitrogen · growth · Brassica napus (oilseed rape)Positive and negative results
64 papers in the same direction as this paper · 17 in the opposite direction
- negative
- positive
- positive
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See all 82 papers →nitrogen · yield · Brassica napus (oilseed rape)Positive and negative results
197 papers in the same direction as this paper · 34 in the opposite direction · 7 reporting no difference from an alternative
- negative
- no effect
- positive
235 papers more in this group
See all 239 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.