Abstract
In this paper,15N differential method was adopted to study the influences of nitrogen fertilizer levels on N loss from rice plant tissue,and the factors of affecting the N loss were analyzed.The N loss from rice tissue was studied by supplying different N rates(N 0,40,80 and 160 mg/L) for 10 d under solution culture.Before the treatments,the N was fed with 15N(abundance 10%),and then the 15N was substituted by normal N during the 10 d treatments.The results show that there are not significant changes in biomass for the 10 d treatments with application of different N rates,which indicates that the absorbed N at the previous stage is available to maintain the growth of rice plant for a period of time.N contents of leaves and root are increased with the increase of N levels,while the 15N abundances of leaves and root are decreased noticeably with the increase of N levels,and the 15N abundance of leaves is noticeably higher than that of root.Obviously,N absorption by plants is increased in the high N treatment,and the absorbed 15N at early stage is diluted,which indicates N is transferring from root to leaves.N deficiency(N 0 mg/L) and over N supply(N 160 mg/L) both increase N loss from plant noticeably,and appropriate N supply(N 80 mg/L) increases N utilization noticeably.The growth stages of rice affect N loss rates remarkably.Under the condition of N 80 mg/L,N loss from plant is increased from 11.6% to 22.3% with the increase of rice growth period.Meanwhile,NH+4-N contents,and GOT activities are increased with the increase of N amount,and pH values of rice leaves are also increased.These results indicate that N use efficiency N is decreased due to the N loss from rice tissue,and ammonia volatilization may be one of the reasons for the N loss.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. 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 15
Claim · model-written summary
Rice biomass did not change significantly among nitrogen rates over ten days.
- Taxon
- rice
Oryza sativat0 - Treatment
- different N ratese0
- Outcome
- biomasse0
- Direction
- not significant changese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there are not significant changes in biomass for the 10 d treatments with application of different N rates”
t0“Effects of nitrogen rate on nitrogen loss from rice plant tissue”
Claim · model-written summary
Leaf and root nitrogen contents increased with nitrogen level.
- Taxon
- riceOryza sativat0
- Treatment
- N levelse0
- Outcome
- N contents of leaves and roote0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N contents of leaves and root are increased with the increase of N levels”
t0“Effects of nitrogen rate on nitrogen loss from rice plant tissue”
Claim · model-written summary
Leaf and root 15N abundance decreased as nitrogen level increased.
- Taxon
- riceOryza sativat0
- Treatment
- N levelse0
- Outcome
- 15N abundances of leaves and roote0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 15N abundances of leaves and root are decreased noticeably with the increase of N levels”
t0“Effects of nitrogen rate on nitrogen loss from rice plant tissue”
Claim · model-written summary
Leaf 15N abundance was higher than root abundance.
- Taxon
- riceOryza sativat0
- Organ / stage
- leavese0
- Outcome
- 15N abundance of leavese0
- Direction
- highere0
- Comparator
- roote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 15N abundance of leaves is noticeably higher than that of root”
t0“Effects of nitrogen rate on nitrogen loss from rice plant tissue”
Claim · model-written summary
Plant nitrogen absorption increased under high nitrogen treatment.
- Taxon
- riceOryza sativat0
- Treatment
- high N treatmente0
- Outcome
- N absorption by plantse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N absorption by plants is increased in the high N treatment”
t0“Effects of nitrogen rate on nitrogen loss from rice plant tissue”
Claim · model-written summary
The authors infer nitrogen transfer from roots to leaves from dilution of previously absorbed 15N.
- Taxon
- riceOryza sativat0
- Organ / stage
- root to leavese0
- Outcome
- N is transferring from root to leavese0
- Qualifier
- absorbed 15N at early stage is dilutede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the absorbed 15N at early stage is diluted,which indicates N is transferring from root to leaves”
t0“Effects of nitrogen rate on nitrogen loss from rice plant tissue”
Claim · model-written summary
N deficiency(N 0 mg/L) increased nitrogen loss from rice.
- Taxon
- riceOryza sativat0
- Treatment
- N deficiency(N 0 mg/L)e0
- Outcome
- N loss from plante0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N deficiency(N 0 mg/L) and over N supply(N 160 mg/L) both increase N loss from plant noticeably”
t0“Effects of nitrogen rate on nitrogen loss from rice plant tissue”
Claim · model-written summary
over N supply(N 160 mg/L) increased nitrogen loss from rice.
- Taxon
- riceOryza sativat0
- Treatment
- over N supply(N 160 mg/L)e0
- Outcome
- N loss from plante0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N deficiency(N 0 mg/L) and over N supply(N 160 mg/L) both increase N loss from plant noticeably”
t0“Effects of nitrogen rate on nitrogen loss from rice plant tissue”
Claim · model-written summary
N supply at 80 mg/L increased nitrogen utilization.
- Taxon
- riceOryza sativat0
- Treatment
- N supply(N 80 mg/L)e0
- Outcome
- N utilizatione0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“appropriate N supply(N 80 mg/L) increases N utilization noticeably”
t0“Effects of nitrogen rate on nitrogen loss from rice plant tissue”
Claim · model-written summary
Rice growth stage affected nitrogen loss rate.
- Taxon
- riceOryza sativae0
- Organ / stage
- growth stagese0
- Outcome
- N loss ratese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth stages of rice affect N loss rates remarkably”
Claim · model-written summary
At 80 mg/L nitrogen, loss from rice increased from 11.6% to 22.3% as growth period advanced.
- Taxon
- riceOryza sativae0
- Organ / stage
- rice growth periode0
- Treatment
- N 80 mg/Le0
- Outcome
- N loss from plante0
- Direction
- increasede0
- Value
- 11.6% to 22.3%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the condition of N 80 mg/L,N loss from plant is increased from 11.6% to 22.3% with the increase of rice growth period”
Claim · model-written summary
NH+4-N contents and GOT activities increased with nitrogen amount.
- Taxon
- riceOryza sativat0
- Treatment
- N amounte0
- Outcome
- NH+4-N contents,and GOT activitiese0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NH+4-N contents,and GOT activities are increased with the increase of N amount”
t0“Effects of nitrogen rate on nitrogen loss from rice plant tissue”
Claim · model-written summary
Rice leaf pH increased with nitrogen amount.
- Taxon
- riceOryza sativae0
- Organ / stage
- leavese0
- Treatment
- nitrogen ratet0
- Outcome
- pH values of rice leavese0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pH values of rice leaves are also increased”
t0“Effects of nitrogen rate on nitrogen loss from rice plant tissue”
Claim · model-written summary
The authors attribute lower nitrogen use efficiency to nitrogen loss from rice tissue.
- Taxon
- riceOryza sativae0
- Outcome
- N use efficiency Ne0
- Qualifier
- N loss from rice tissuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N use efficiency N is decreased due to the N loss from rice tissue”
Claim · model-written summary
The authors suggest ammonia volatilization may explain some nitrogen loss from rice tissue.
- Taxon
- riceOryza sativat0
- Outcome
- N losse0
- Qualifier
- ammonia volatilization may be one of the reasonse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ammonia volatilization may be one of the reasons for the N loss”
t0“Effects of nitrogen rate on nitrogen loss from rice plant tissue”
The same questions in other papers
nitrogen · growth · Oryza sativa (rice)Positive and negative results
108 papers in the same direction as this paper · 402 in the opposite direction
- positive
- positive
- positive
507 papers more in this group
See all 511 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.