Abstract
Although nitrogen application could improve growth and yield of roselle, fertilizer recommendations for Niger are lacking. The objective of this study was to evaluate the effects of two treatments of nitrogen (N1=50 kg N,ha−1 and N2=100 kg N.ha−1) on yields and yield components in three ecotypes of Roselle (A3, A7 and A9). An increase in nitrogen was associated with an increase in leaf yield in every ecotype. However, there was no significant difference in yields between N1 and N2. Compared with the control plants (N0), the increase was about 181% for A3, 70% for A7 and 95% for A9 at N2. This level of nitrogen significantly decreased seed yield by 30% for A3 and 48%, respectively for A7 and A9. Nitrogen treatment had no effect on calyx yield which was approximately identical for the three ecotype (420 kg ha−1). With the exception of the number of branches/plant, yield components were not affected by nitrogen application. Therefore, N1 could be considered as the optimum fertilization for leaf yield.
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Claims 11
Claim · model-written summary
Increased nitrogen was associated with increased leaf yield in every roselle ecotype.
- Taxon
- Roselle
Hibiscus sabdariffae0 - Treatment
- nitrogene1
- Outcome
- leaf yielde1
- Direction
- increasee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The objective of this study was to evaluate the effects of two treatments of nitrogen (N1=50 kg N,ha−1 and N2=100 kg N.ha−1) on yields and yield components in three ecotypes of Roselle (A3, A7 and A9)”
e1“An increase in nitrogen was associated with an increase in leaf yield in every ecotype”
Claim · model-written summary
N2 (100 kg N ha-1) did not significantly change yields compared with N1 (50 kg N ha-1).
- Taxon
- RoselleHibiscus sabdariffae0
- Treatment
- N2=100 kg N.ha−1e0
- Outcome
- yieldse2
- Direction
- no significant differencee2
- Comparator
- N1=50 kg N,ha−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The objective of this study was to evaluate the effects of two treatments of nitrogen (N1=50 kg N,ha−1 and N2=100 kg N.ha−1) on yields and yield components in three ecotypes of Roselle (A3, A7 and A9)”
e2“there was no significant difference in yields between N1 and N2”
Claim · model-written summary
N2 increased leaf yield by about 181% for ecotype A3 compared with control plants.
- Taxon
- RoselleHibiscus sabdariffae0
- Material
- A3e3
- Treatment
- N2=100 kg N.ha−1e0
- Outcome
- leaf yielde1
- Direction
- increasee3
- Value
- 181%e3
- Comparator
- control plants (N0)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The objective of this study was to evaluate the effects of two treatments of nitrogen (N1=50 kg N,ha−1 and N2=100 kg N.ha−1) on yields and yield components in three ecotypes of Roselle (A3, A7 and A9)”
e1“An increase in nitrogen was associated with an increase in leaf yield in every ecotype”
e3“Compared with the control plants (N0), the increase was about 181% for A3, 70% for A7 and 95% for A9 at N2”
Claim · model-written summary
N2 increased leaf yield by about 70% for ecotype A7 compared with control plants.
- Taxon
- RoselleHibiscus sabdariffae0
- Material
- A7e3
- Treatment
- N2=100 kg N.ha−1e0
- Outcome
- leaf yielde1
- Direction
- increasee3
- Value
- 70%e3
- Comparator
- control plants (N0)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The objective of this study was to evaluate the effects of two treatments of nitrogen (N1=50 kg N,ha−1 and N2=100 kg N.ha−1) on yields and yield components in three ecotypes of Roselle (A3, A7 and A9)”
e1“An increase in nitrogen was associated with an increase in leaf yield in every ecotype”
e3“Compared with the control plants (N0), the increase was about 181% for A3, 70% for A7 and 95% for A9 at N2”
Claim · model-written summary
N2 increased leaf yield by about 95% for ecotype A9 compared with control plants.
- Taxon
- RoselleHibiscus sabdariffae0
- Material
- A9e3
- Treatment
- N2=100 kg N.ha−1e0
- Outcome
- leaf yielde1
- Direction
- increasee3
- Value
- 95%e3
- Comparator
- control plants (N0)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The objective of this study was to evaluate the effects of two treatments of nitrogen (N1=50 kg N,ha−1 and N2=100 kg N.ha−1) on yields and yield components in three ecotypes of Roselle (A3, A7 and A9)”
e1“An increase in nitrogen was associated with an increase in leaf yield in every ecotype”
e3“Compared with the control plants (N0), the increase was about 181% for A3, 70% for A7 and 95% for A9 at N2”
Claim · model-written summary
The N2 level significantly decreased seed yield by 30% in ecotype A3.
- Taxon
- RoselleHibiscus sabdariffae0
- Material
- A3e4
- Treatment
- This level of nitrogene4
- Outcome
- seed yielde4
- Direction
- decreasede4
- Value
- 30%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The objective of this study was to evaluate the effects of two treatments of nitrogen (N1=50 kg N,ha−1 and N2=100 kg N.ha−1) on yields and yield components in three ecotypes of Roselle (A3, A7 and A9)”
e4“This level of nitrogen significantly decreased seed yield by 30% for A3 and 48%, respectively for A7 and A9”
Claim · model-written summary
The N2 level significantly decreased seed yield by 48% in ecotypes A7 and A9.
- Taxon
- RoselleHibiscus sabdariffae0
- Material
- A7 and A9e4
- Treatment
- This level of nitrogene4
- Outcome
- seed yielde4
- Direction
- decreasede4
- Value
- 48%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The objective of this study was to evaluate the effects of two treatments of nitrogen (N1=50 kg N,ha−1 and N2=100 kg N.ha−1) on yields and yield components in three ecotypes of Roselle (A3, A7 and A9)”
e4“This level of nitrogen significantly decreased seed yield by 30% for A3 and 48%, respectively for A7 and A9”
Claim · model-written summary
Nitrogen treatment had no effect on calyx yield, which was about 420 kg ha-1 and similar across the three ecotypes.
- Taxon
- RoselleHibiscus sabdariffae0
- Treatment
- Nitrogen treatmente5
- Outcome
- calyx yielde5
- Direction
- no effecte5
- Value
- 420 kg ha−1e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The objective of this study was to evaluate the effects of two treatments of nitrogen (N1=50 kg N,ha−1 and N2=100 kg N.ha−1) on yields and yield components in three ecotypes of Roselle (A3, A7 and A9)”
e5“Nitrogen treatment had no effect on calyx yield which was approximately identical for the three ecotype (420 kg ha−1)”
Claim · model-written summary
Nitrogen application did not affect yield components, except the number of branches per plant.
- Taxon
- RoselleHibiscus sabdariffae0
- Treatment
- nitrogen applicatione6
- Outcome
- yield componentse6
- Direction
- not affectede6
- Qualifier
- the number of branches/plante6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The objective of this study was to evaluate the effects of two treatments of nitrogen (N1=50 kg N,ha−1 and N2=100 kg N.ha−1) on yields and yield components in three ecotypes of Roselle (A3, A7 and A9)”
e6“With the exception of the number of branches/plant, yield components were not affected by nitrogen application”
Claim · model-written summary
Number of branches per plant responded to nitrogen application, as an exception to the yield components.
- Taxon
- RoselleHibiscus sabdariffae0
- Treatment
- nitrogen applicatione6
- Outcome
- number of branches/plante6
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The objective of this study was to evaluate the effects of two treatments of nitrogen (N1=50 kg N,ha−1 and N2=100 kg N.ha−1) on yields and yield components in three ecotypes of Roselle (A3, A7 and A9)”
e6“With the exception of the number of branches/plant, yield components were not affected by nitrogen application”
Claim · model-written summary
N1 (50 kg N ha-1) could be considered the optimum fertilization for leaf yield.
- Taxon
- RoselleHibiscus sabdariffae0
- Treatment
- N1e7
- Outcome
- optimum fertilizatione7
- Qualifier
- for leaf yielde7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The objective of this study was to evaluate the effects of two treatments of nitrogen (N1=50 kg N,ha−1 and N2=100 kg N.ha−1) on yields and yield components in three ecotypes of Roselle (A3, A7 and A9)”
e7“Therefore, N1 could be considered as the optimum fertilization for leaf yield”
The same questions in other papers
nitrogen · yield · Hibiscus sabdariffa (roselle)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 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.