Abstract
Nitrogenous fertilisers are under consideration for promoting the growth of nursery-reared hoop pine (Araucaria cunninghamii Aiton ex A. Cunn) seedlings in the establishment phase of second rotation (2R) plantations. Using 15N-labelled fertilisers, we investigated the effect of different forms (ammonium sulphate, ammonium nitrate, potassium nitrate and urea) and rates of application (0, 150 and 300 mg N kg-1 dried soil) of fertilisers on the growth, 15N recovery and carbon isotope composition (δ13C) of hoop pine seedlings in a 12-month glasshouse trial in southeast Queensland, Australia. The 15N-labelled fertilisers were applied to nursery-reared hoop pine seedlings, which were then grown in pots, containing ca. 1.2 kg dried soil, under well watered conditions for 12 months. Four seedlings from each treatment were harvested at 4-month intervals, divided into roots, stem and foliage, with a further subdivision for new and old foliage, and then analysed for 15N, total N,δ13C and total C. There was no significant response in the seedling growth to the form or rate of application of nitrogen (N) fertiliser within the 12-month period, indicating that the seedlings did not experience N deficiency when grown on second rotation hoop pine soils. While the combined 15N recovery from soil and plant remained at around 70% throughout the experiment, the proportion of 15N recovered from the plants increasing steadily over time. Nitrate containing fertilisers at 150 mg N kg-1 soil gradually increased seedling foliageδ13C over the 12-month period, indicating an increase in seedling water use efficiency.
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Claims 5
Claim · model-written summary
Seedling growth did not respond significantly to nitrogen fertilizer form or rate within twelve months.
- Taxon
- Araucaria cunninghamii
Araucaria cunninghamiit0 - Treatment
- nitrogen (N) fertilisere0
- Outcome
- seedling growthe0
- Direction
- no significant responsee0
- Qualifier
- within the 12-month periode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant response in the seedling growth to the form or rate of application of nitrogen (N) fertiliser within the 12-month period”
t0“Araucaria cunninghamii”
Claim · model-written summary
Combined nitrogen-15 recovery from soil and plants stayed around 70%.
- Taxon
- Araucaria cunninghamiiAraucaria cunninghamiit0
- Outcome
- combined 15N recovery from soil and plante0
- Direction
- remainede0
- Value
- 70%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“combined 15N recovery from soil and plant remained at around 70% throughout the experiment”
t0“Araucaria cunninghamii”
Claim · model-written summary
The share of nitrogen-15 recovered from plants rose over time.
- Taxon
- Araucaria cunninghamiiAraucaria cunninghamiit0
- Outcome
- proportion of 15N recovered from the plantse0
- Direction
- increasing steadilye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proportion of 15N recovered from the plants increasing steadily over time”
t0“Araucaria cunninghamii”
Claim · model-written summary
Nitrate-containing fertilizers at 150 mg N kg-1 soil increased foliage δ13C over twelve months.
- Taxon
- Araucaria cunninghamiiAraucaria cunninghamiit0
- Treatment
- Nitrate containing fertilisers at 150 mg N kg-1 soile0
- Outcome
- seedling foliageδ13Ce0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate containing fertilisers at 150 mg N kg-1 soil gradually increased seedling foliageδ13C over the 12-month period”
t0“Araucaria cunninghamii”
Claim · model-written summary
The authors interpret the δ13C increase as greater seedling water use efficiency.
- Taxon
- Araucaria cunninghamiiAraucaria cunninghamiit0
- Treatment
- Nitrate containing fertilisers at 150 mg N kg-1 soile1
- Outcome
- seedling water use efficiencye0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“indicating an increase in seedling water use efficiency”
e1“Nitrate containing fertilisers at 150 mg N kg-1 soil gradually increased seedling foliageδ13C”
t0“Araucaria cunninghamii”
The same questions in other papers
fertilization · growth · Araucaria cunninghamii (hoop pine)Positive and negative results
1 in the opposite direction
- positive
nitrogen · growth · Araucaria cunninghamii (hoop pine)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
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.