Abstract
The effect of month of harvest on the biomass production of coppice growth from tea tree plants (Melaleuca alternifolia) grown under plantation conditions and harvested annually was assessed in a field experiment on the north coast of New South Wales. Tea tree oil is obtained from leaves, and the yield of leaf is determined by the total plant yield, the proportion of twig in total yield, and the proportion of leaf in twig. Harvesting between July and October gave a significant increase in total plant yield over other months. This advantage appeared to come from synchronising the most efficient stage of growth (4-6 months after harvest) with the best growing conditions. Under the same environment conditions, the relative efficiencies of regrowth were 46, 100, and 71 during months 1-3, 4-6, and 7-12, respectively. District observations suggested that there would be little growth at mean monthly temperatures <16OC, and the data analysis showed a reduction in growth when the soil dried to <69% of the total available water capacity. The proportion of twig in total yield was affected by the total plant weight, and the proportion of leaf in twig responded to the air temperature. However, variation in both proportions had a relatively minor effect on leaf yield, and changes in total plant yield accounted for more than 90% of the variation in leaf yield.
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Claims 8
Claim · model-written summary
July to October harvest significantly increased total plant yield.
- Taxon
- tea tree plants (Melaleuca alternifolia)
.jpg?width=60)
Melaleuca alternifoliae1 - Treatment
- Harvesting between July and Octobere0
- Outcome
- total plant yielde0
- Direction
- increasee0
- Comparator
- other monthse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Harvesting between July and October gave a significant increase in total plant yield over other months”
e1“tea tree plants (Melaleuca alternifolia)”
Claim · model-written summary
Relative regrowth efficiency was 46 during months 1-3.
- Taxon
- tea tree plants (Melaleuca alternifolia)Melaleuca alternifoliae1
- Outcome
- relative efficiencies of regrowthe0
- Value
- 46e0
- Qualifier
- months 1-3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“relative efficiencies of regrowth were 46, 100, and 71 during months 1-3, 4-6, and 7-12, respectively”
e1“tea tree plants (Melaleuca alternifolia)”
Claim · model-written summary
Relative regrowth efficiency was 100 during months 4-6.
- Taxon
- tea tree plants (Melaleuca alternifolia)Melaleuca alternifoliae1
- Outcome
- relative efficiencies of regrowthe0
- Value
- 100e0
- Qualifier
- 4-6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“relative efficiencies of regrowth were 46, 100, and 71 during months 1-3, 4-6, and 7-12, respectively”
e1“tea tree plants (Melaleuca alternifolia)”
Claim · model-written summary
Relative regrowth efficiency was 71 during months 7-12.
- Taxon
- tea tree plants (Melaleuca alternifolia)Melaleuca alternifoliae1
- Outcome
- relative efficiencies of regrowthe0
- Value
- 71e0
- Qualifier
- 7-12e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“relative efficiencies of regrowth were 46, 100, and 71 during months 1-3, 4-6, and 7-12, respectively”
e1“tea tree plants (Melaleuca alternifolia)”
Claim · model-written summary
Growth was reduced when soil water fell below 69% of available capacity.
- Taxon
- tea tree plants (Melaleuca alternifolia)Melaleuca alternifoliae1
- Outcome
- growthe0
- Direction
- reductione0
- Qualifier
- <69% of the total available water capacitye0
- Setting
- soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the data analysis showed a reduction in growth when the soil dried to <69% of the total available water capacity”
e1“tea tree plants (Melaleuca alternifolia)”
Claim · model-written summary
Twig proportion in total yield was affected by total plant weight.
- Taxon
- tea tree plants (Melaleuca alternifolia)Melaleuca alternifoliae1
- Organ / stage
- twige0
- Outcome
- proportion of twig in total yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The proportion of twig in total yield was affected by the total plant weight”
e1“tea tree plants (Melaleuca alternifolia)”
Claim · model-written summary
Leaf proportion in twig responded to air temperature.
- Taxon
- tea tree plants (Melaleuca alternifolia)Melaleuca alternifoliae1
- Organ / stage
- leafe0
- Outcome
- proportion of leaf in twige0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the proportion of leaf in twig responded to the air temperature”
e1“tea tree plants (Melaleuca alternifolia)”
Claim · model-written summary
Changes in total plant yield explained over 90% of leaf-yield variation.
- Taxon
- tea tree plants (Melaleuca alternifolia)Melaleuca alternifoliae1
- Organ / stage
- leafe0
- Outcome
- variation in leaf yielde0
- Value
- more than 90%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“changes in total plant yield accounted for more than 90% of the variation in leaf yield”
e1“tea tree plants (Melaleuca alternifolia)”