Abstract
Fertilizer isotope labelling (15N) of young Lane Late potted orange trees with differential N rates at three phenological periods (end of flowering, fruit set and fruit growth) was used to determine patterns of N uptake response and N efficiency (NUE) along the growing cycle. In a first experiment trees were fed with a saturating N solution in order to determine seasonal variations in N requirements. The second experiment tested four N rates which were equal to (N1), two (N2), three (N3) and four-fold (N4) the N requirements at each period. Increasing N rate diminished NUE being the decrease more acute at flowering as a consequence of the lower response in N uptake to increased N supply in this period. Theoretical NUE corresponding to a fertilizer rate that fulfills plant requirements in each period was calculated, being highest at the end of fruit set period (72%), which contrasted with the value obtained for flowering (28%), when potential nitrogen leaching reached therefore its maximum (71%).
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Claims 6
Claim · model-written summary
Increasing nitrogen rate diminished nitrogen use efficiency.
CitrusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N rate diminished NUE being the decrease more acute at flowering as a consequence of the lower response in N uptake to increased N supply in this period.”
e1“young Lane Late potted orange trees”
t0“Seasonal Changes in Nitrate Uptake Efficiency in Young Potted Citrus Trees”
Claim · model-written summary
The decrease in nitrogen use efficiency with higher nitrogen rate was more acute at flowering.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N rate diminished NUE being the decrease more acute at flowering as a consequence of the lower response in N uptake to increased N supply in this period.”
t0“Seasonal Changes in Nitrate Uptake Efficiency in Young Potted Citrus Trees”
Claim · model-written summary
Nitrogen uptake responded less to increased supply at flowering.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N rate diminished NUE being the decrease more acute at flowering as a consequence of the lower response in N uptake to increased N supply in this period.”
t0“Seasonal Changes in Nitrate Uptake Efficiency in Young Potted Citrus Trees”
Claim · model-written summary
Theoretical nitrogen use efficiency was highest at the end of fruit set, at 72%.
- Organ / stage
- end of fruit set periode0
- Outcome
- Theoretical NUEe0
- Direction
- higheste0
- Value
- 72%e0
- Qualifier
- a fertilizer rate that fulfills plant requirements in each periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Theoretical NUE corresponding to a fertilizer rate that fulfills plant requirements in each period was calculated, being highest at the end of fruit set period (72%)”
t0“Seasonal Changes in Nitrate Uptake Efficiency in Young Potted Citrus Trees”
Claim · model-written summary
Theoretical nitrogen use efficiency at flowering was 28%.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which contrasted with the value obtained for flowering (28%)”
e1“Theoretical NUE corresponding to a fertilizer rate that fulfills plant requirements in each period was calculated, being highest at the end of fruit set period (72%)”
t0“Seasonal Changes in Nitrate Uptake Efficiency in Young Potted Citrus Trees”
Claim · model-written summary
Potential nitrogen leaching reached a maximum of 71% at flowering.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when potential nitrogen leaching reached therefore its maximum (71%)”
e1“Increasing N rate diminished NUE being the decrease more acute at flowering as a consequence of the lower response in N uptake to increased N supply in this period.”
t0“Seasonal Changes in Nitrate Uptake Efficiency in Young Potted Citrus Trees”
The same questions in other papers
nitrogen · nutrient: content · CitrusPositive and negative results
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See all 10 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.