Abstract
One-year-old potted Newhall navel orange(Citrus sinensis Osbeck cv.Newhall) seedlings on trifoliate orange(Poncirus trifoliata(L.) Raf.) rootstock were applied with different levels of nitrogen(N),and the effects of N application levels on leaf abscission,leaf N content and the seasonal changes in leaf chlorophyll content of spring,summer and autumn shoots were studied.Results showed that leaf abscission rates of spring and summer shoots on trees applied with N tended to decrease in the following May,while that of autumn shoots tended to increase.There was no significant correlation between N application level and leaf abscission during other seasons.A significantly positive correlation existed between N content in leaves and per tree N application level(r=0.97).The chlorophyll content in leaves of spring,summer and autumn shoots on trees treated with application of N was significantly increased and was relatively steady in the whole studied period.No further increase in leaf chlorophyll content was observed as the application rate exceeded 6.5 g of N.However,higher rate of N application was beneficial to the maintenance of a steady chlorophyll level.The chlorophyll content in leaves of all shoots of control trees decreased obviously in October and sharply in the following April.These results suggested that N application could increase chlorophyll content in leaves of Newhall navel orange and reduce the seasonal changes in chlorophyll level.
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Claims 7
Claim · model-written summary
Applied nitrogen tended to reduce spring and summer shoot leaf abscission the following May.
- Taxon
- Newhall Navel Oranget0
- Organ / stage
- spring and summer shootse0
- Treatment
- Ne0
- Outcome
- leaf abscission ratese0
- Direction
- decreasee0
Not reportedComparator
Verbatim
e0“leaf abscission rates of spring and summer shoots on trees applied with N tended to decrease in the following May”
t0“Newhall Navel Orange”
Claim · model-written summary
Nitrogen level had no significant correlation with leaf abscission in other seasons.
Verbatim
e0“There was no significant correlation between N application level and leaf abscission during other seasons.”
t0“Newhall Navel Orange”
Claim · model-written summary
Leaf nitrogen content correlated positively with nitrogen application level.
Verbatim
e0“A significantly positive correlation existed between N content in leaves and per tree N application level(r=0.97).”
t0“Newhall Navel Orange”
Claim · model-written summary
Nitrogen application significantly increased leaf chlorophyll content across shoots.
- Taxon
- Newhall Navel Oranget0
- Organ / stage
- spring,summer and autumn shootse0
- Treatment
- application of Ne0
- Outcome
- chlorophyll content in leavese0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“The chlorophyll content in leaves of spring,summer and autumn shoots on trees treated with application of N was significantly increased and was relatively steady in the whole studied period.”
t0“Newhall Navel Orange”
Claim · model-written summary
Chlorophyll content stopped increasing above 6.5 g nitrogen.
Verbatim
e0“No further increase in leaf chlorophyll content was observed as the application rate exceeded 6.5 g of N.”
t0“Newhall Navel Orange”
Claim · model-written summary
Higher nitrogen rates helped maintain steady chlorophyll.
Not reportedDirection
Verbatim
e0“higher rate of N application was beneficial to the maintenance of a steady chlorophyll level.”
t0“Newhall Navel Orange”
Claim · model-written summary
Control leaf chlorophyll fell in October and the following April.
Verbatim
e0“The chlorophyll content in leaves of all shoots of control trees decreased obviously in October and sharply in the following April.”
t0“Newhall Navel Orange”
The same questions in other papers
nitrogen · yield · Citrus sinensis (sweet orange)Results differ
38 papers in the same direction as this paper · 8 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- negative
44 papers more in this group
See all 48 papers →nitrogen · physiology: pigments · Citrus sinensis (sweet orange)Results agree
1 paper in the same direction as this paper
- positive
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.