Abstract
The accurate prediction of leaf area production is an important element of many crop models, given that it is the key determinant of light interception and the accumulation of plant biomass. Plant density has been reported to have a significant influence on the component processes of leaf area production in hemp. This study investigates the response to plant density of leaf (node) appearance, leaf expansion at each node and leaf senescence, and develops relationships for use in the hemp model described in the final paper of this series. Green and senesced node counts were made at regular intervals in a plant density trial for treatments of 50, 80, 120, 200 and 300 plants/m2. Measurements were also made of the fully expanded leaf area at each node. Leaf pairs were found to appear and senesce at constant thermal time durations; between 84 and 97°Cd for node production, and between 130 and 167°Cd for node senescence. Leaf area per node at first increased linearly with node number, then reached a plateau, and subsequently declined linearly. Increases in plant density resulted in slower rates of node production and reduced the maximum leaf area per node.
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Claims 5
Claim · model-written summary
Leaf pairs appeared at a constant thermal time of 84 to 97 °Cd per node in hemp.
- Taxon
- hemp
Cannabis sativa subsp. sativae0 - Outcome
- node productione2
- Value
- 84 and 97°Cde2
- Qualifier
- constant thermal time durationse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant density has been reported to have a significant influence on the component processes of leaf area production in hemp”
e2“Leaf pairs were found to appear and senesce at constant thermal time durations; between 84 and 97°Cd for node production, and between 130 and 167°Cd for node senescence”
Claim · model-written summary
Leaf pairs senesced at a constant thermal time of 130 and 167 °Cd in hemp.
- Taxon
- hempCannabis sativa subsp. sativae0
- Outcome
- node senescencee2
- Value
- 130 and 167°Cde2
- Qualifier
- constant thermal time durationse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant density has been reported to have a significant influence on the component processes of leaf area production in hemp”
e2“Leaf pairs were found to appear and senesce at constant thermal time durations; between 84 and 97°Cd for node production, and between 130 and 167°Cd for node senescence”
Claim · model-written summary
Leaf area per node first increased linearly with node number in hemp, then plateaued and declined linearly.
- Taxon
- hempCannabis sativa subsp. sativae0
- Organ / stage
- node numbere3
- Outcome
- Leaf area per nodee3
- Direction
- increased linearlye3
- Qualifier
- then reached a plateau, and subsequently declined linearlye3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant density has been reported to have a significant influence on the component processes of leaf area production in hemp”
e3“Leaf area per node at first increased linearly with node number, then reached a plateau, and subsequently declined linearly”
Claim · model-written summary
Increased plant density slowed the rate of node production in hemp.
- Taxon
- hempCannabis sativa subsp. sativae0
- Treatment
- Increases in plant densitye4
- Outcome
- node productione4
- Direction
- slowere4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant density has been reported to have a significant influence on the component processes of leaf area production in hemp”
e4“Increases in plant density resulted in slower rates of node production and reduced the maximum leaf area per node”
Claim · model-written summary
Increased plant density reduced the maximum leaf area per node in hemp.
- Taxon
- hempCannabis sativa subsp. sativae0
- Treatment
- Increases in plant densitye4
- Outcome
- maximum leaf area per nodee4
- Direction
- reducede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant density has been reported to have a significant influence on the component processes of leaf area production in hemp”
e4“Increases in plant density resulted in slower rates of node production and reduced the maximum leaf area per node”