Abstract
Excessive nitrogen (N) application is widespread in Southern China. The effects of N fertilization on soil properties and crop physiology are poorly understood in tropical red loam soil. We conducted a field experiment to evaluate the effect of nitrogen fertilization rates on physiological attributes (chlorophyll, plant metabolic enzymes, soluble matters) on banana leaves, soil properties (soil enzymes, soil organic matter (SOM), soil available nutrients) as well as banana crop yield in a subtropical region of southern China. The N rates tested were 0 (N 0 ), 145 (N 145 ), 248 (N 248 ), 352 (N 352 ), 414 (N FT ), and 455 (N 455 ) g N per plant. The correlations among soil factors, leaf physiological factors and crop yield were evaluated. The results indiated that the high rates of N fertilization (N FT and N 455 ) significantly decreased soil available potassium (K) content, available phosphorus (P) content, glutamine synthetase (GS) activity, and soluble protein and sugar contents compared with lower N rates. The N 352 treatment had the highest crop yields compared with higher N rates treatments, followed by the N 455 treatment. However, there were no significant differences in crop yields among N fertilization treatments. Factor analysis showed that the N 352 treatment had the highest integrated score for soil and leaf physiological factors among all treatments. Moreover, the N 352 treatment was the most effective in improving carbon and nitrogen metabolism in banana. Crop yield was significantly and positively linearly correlated with the integrated score ( r = 0.823, p < 0.05). Path analysis revealed that invertase, SOM and sucrose synthase (SS) had a strong positive effect on banana yield. Canonical correspondence analysis (CCA) suggested that available K, invertase, acid phosphatase and available P were the most important factors impacting leaf physiological attributes. Cluster analysis demonstrated distinct differences in N application treatment related to variations in soil and leaf factors. This study suggested that excessive N fertilization had a negative effect on soil fertility, crop physiology and yield. The lower N rates were more effective in improving crop yield than higher rates of N fertilization. The N rate of 352 g N per plant (N 352 ) was recommended to reduce excess N input while maintaining the higher yield for local farmers’ banana planting.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 16
Claim · model-written summary
High nitrogen rates significantly decreased soil available potassium (K) content.
Verbatim
e0“The results indiated that the high rates of N fertilization (N FT and N 455 ) significantly decreased soil available potassium (K) content, available phosphorus (P) content, glutamine synthetase (GS) activity, and soluble protein and sugar contents compared with lower N rates.”
t0“banana”
Claim · model-written summary
High nitrogen rates significantly decreased available phosphorus (P) content.
Verbatim
e0“The results indiated that the high rates of N fertilization (N FT and N 455 ) significantly decreased soil available potassium (K) content, available phosphorus (P) content, glutamine synthetase (GS) activity, and soluble protein and sugar contents compared with lower N rates.”
t0“banana”
Claim · model-written summary
High nitrogen rates significantly decreased glutamine synthetase (GS) activity.
Verbatim
e0“The results indiated that the high rates of N fertilization (N FT and N 455 ) significantly decreased soil available potassium (K) content, available phosphorus (P) content, glutamine synthetase (GS) activity, and soluble protein and sugar contents compared with lower N rates.”
t0“banana”
Claim · model-written summary
High nitrogen rates significantly decreased soluble protein and sugar contents.
Verbatim
e0“The results indiated that the high rates of N fertilization (N FT and N 455 ) significantly decreased soil available potassium (K) content, available phosphorus (P) content, glutamine synthetase (GS) activity, and soluble protein and sugar contents compared with lower N rates.”
t0“banana”
Claim · model-written summary
N 352 gave the highest crop yield relative to higher rates.
Verbatim
e0“The N 352 treatment had the highest crop yields compared with higher N rates treatments, followed by the N 455 treatment.”
t0“banana”
Claim · model-written summary
N 455 was next in crop yield after N 352.
Verbatim
e0“The N 352 treatment had the highest crop yields compared with higher N rates treatments, followed by the N 455 treatment.”
t0“banana”
Claim · model-written summary
Crop yield differences among nitrogen treatments were not significant.
- Taxon
- bananat0
- Treatment
- N fertilization treatmentse0
- Outcome
- crop yieldse0
- Direction
- no significant differencese0
Not reportedComparator
Verbatim
e0“there were no significant differences in crop yields among N fertilization treatments”
t0“banana”
Claim · model-written summary
N 352 had the highest integrated soil and leaf physiological score.
Verbatim
e0“Factor analysis showed that the N 352 treatment had the highest integrated score for soil and leaf physiological factors among all treatments.”
t0“banana”
Claim · model-written summary
N 352 most effectively improved banana carbon and nitrogen metabolism.
Not reportedComparator
Verbatim
e0“the N 352 treatment was the most effective in improving carbon and nitrogen metabolism in banana”
Claim · model-written summary
Crop yield was positively correlated with the integrated score.
Verbatim
e0“Crop yield was significantly and positively linearly correlated with the integrated score ( r = 0.823, p < 0.05).”
t0“banana”
Claim · model-written summary
Invertase, soil organic matter and sucrose synthase had strong positive effects on banana yield in path analysis.
Verbatim
e0“Path analysis revealed that invertase, SOM and sucrose synthase (SS) had a strong positive effect on banana yield.”
Claim · model-written summary
Available potassium, invertase, acid phosphatase and available phosphorus were the most important factors for leaf physiology.
- Taxon
- bananat0
- Gene
- invertasee0
- Outcome
- leaf physiological attributese0
- Qualifier
- available K, invertase, acid phosphatase and available Pe0
Not reportedDirection
Verbatim
e0“Canonical correspondence analysis (CCA) suggested that available K, invertase, acid phosphatase and available P were the most important factors impacting leaf physiological attributes.”
t0“banana”
Claim · model-written summary
Cluster analysis found distinct nitrogen treatment differences in soil and leaf factors.
Verbatim
e0“Cluster analysis demonstrated distinct differences in N application treatment related to variations in soil and leaf factors.”
t0“banana”
Claim · model-written summary
The authors concluded excessive nitrogen harmed soil fertility, crop physiology and yield.
Verbatim
e0“This study suggested that excessive N fertilization had a negative effect on soil fertility, crop physiology and yield.”
t0“banana”
Claim · model-written summary
Lower nitrogen rates improved crop yield more than higher rates.
Verbatim
e0“The lower N rates were more effective in improving crop yield than higher rates of N fertilization.”
t0“banana”
Claim · model-written summary
The authors recommended 352 g nitrogen per plant to reduce excess nitrogen input while maintaining yield.
Verbatim
e0“The N rate of 352 g N per plant (N 352 ) was recommended to reduce excess N input while maintaining the higher yield for local farmers’ banana planting.”
The same questions in other papers
fertilization · physiology: osmolytes · MusaPositive and negative results
6 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →fertilization · molecular: metabolites · MusaPositive and negative results
7 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →fertilization · soil: chemistry · MusaPositive and negative results
7 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →nitrogen · yield · MusaPositive and negative results
40 papers in the same direction as this paper · 7 in the opposite direction
- no effect
- no effect
- no effect
44 papers more in this group
See all 48 papers →fertilization · yield · MusaPositive and negative results
9 papers in the same direction as this paper · 118 in the opposite direction
- positive
- positive
- positive
124 papers more in this group
See all 128 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.