Abstract
The oil concentration in tea-tree (Melaleuca alternifolia Cheel) twigs was measured over 8 consecutive days during November 1987, and over 10 out of 12 consecutive days in January 1989. The oil concentration, measured in units of volume of oil per unit dry weight of twigs (v/DW), varied markedly between successive days, from 2.9-1.8% v/DW (a 38% decrease) to 1.8-3.4% v/DW (a 89% increase). The reason for such variation is unknown but it had a pronounced effect on the profitability of growing the crop. The profit, which was expressed as a return on the total set-up cost of $A17 2591ha, was estimated for each of the measured oil concentrations and fixed values of biomass yield, the price of oil and average production costs. The extreme daily variations in oil concentration mentioned above caused the return on investment to decline by 11 percentage points and increase by 16 points, respectively. When measured at the same site, the mean oil concentration increased from 3.1% vPW in November 1987 to 5.8% v/DW in January 1989. As a consequence, the respective mean returns on investment increased from 0 to 26%.
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Claims 6
Claim · model-written summary
Twig oil concentration fell from 2.9 to 1.8% v/DW across successive days.
- Taxon
- tea-tree
Camellia sinensise0 - Organ / stage
- twigse0
- Outcome
- oil concentratione2
- Direction
- decreasee1
- Value
- 38%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tea-tree (Melaleuca alternifolia Cheel) twigs”
e1“from 2.9-1.8% v/DW (a 38% decrease)”
e2“The oil concentration, measured in units of volume of oil per unit dry weight of twigs (v/DW)”
Claim · model-written summary
Twig oil concentration rose from 1.8 to 3.4% v/DW across successive days.
- Taxon
- tea-treeCamellia sinensise0
- Organ / stage
- twigse0
- Outcome
- oil concentratione2
- Direction
- increasee1
- Value
- 89%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tea-tree (Melaleuca alternifolia Cheel) twigs”
e1“to 1.8-3.4% v/DW (a 89% increase)”
e2“The oil concentration, measured in units of volume of oil per unit dry weight of twigs (v/DW)”
Claim · model-written summary
The oil concentration decline caused return on investment to decline by 11 percentage points.
- Taxon
- tea-treeCamellia sinensise0
- Compound
- oil concentratione1
- Outcome
- return on investmente1
- Direction
- declinee1
- Value
- 11 percentage pointse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tea-tree ( Melaleuca alternifolia Cheel) oil”
e1“daily variations in oil concentration mentioned above caused the return on investment to decline by 11 percentage points”
Claim · model-written summary
The oil concentration rise caused return on investment to increase by 16 points.
- Taxon
- tea-treeCamellia sinensise0
- Compound
- oil concentratione1
- Outcome
- return on investmente1
- Direction
- increasee1
- Value
- 16 pointse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tea-tree ( Melaleuca alternifolia Cheel) oil”
e1“daily variations in oil concentration mentioned above caused the return on investment to decline by 11 percentage points and increase by 16 points, respectively”
Claim · model-written summary
Mean oil concentration increased from 3.1% vPW to 5.8% v/DW between November 1987 and January 1989.
- Taxon
- tea-treeCamellia sinensist0
- Outcome
- mean oil concentratione0
- Direction
- increasede0
- Value
- 3.1% vPW in November 1987 to 5.8% v/DWe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the mean oil concentration increased from 3.1% vPW in November 1987 to 5.8% v/DW in January 1989”
t0“tea-tree”
Claim · model-written summary
Mean return on investment increased from 0 to 26%.
- Taxon
- tea-treeCamellia sinensist0
- Outcome
- mean returns on investmente0
- Direction
- increasede0
- Value
- 0 to 26%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“respective mean returns on investment increased from 0 to 26%”
t0“tea-tree”