Abstract
Six plantings of elephant grass (Pennisetum purpureurn) were made at 2-monthly intervals in the wet tropics of north Queensland. Each crop was sampled for yield at monthly intervals. After 6 months' growth each crop was ratooned for a further 6 months' growth, with yield samples again being taken at monthly intervals. As well, stem elongation growth was measured twice weekly, together with various climatic parameters and soil moisture to 90 cm. Regrowths after each monthly harvest were sampled 1 month after cutting. Short-term growth, measured as elongation growth and averaged for the whole experimental period, was found to have a significant parabolic relationship with crop age and available soil moisture percentage, but not with average temperature or evaporation. Regrowth yields were found to be linearly and positively correlated with tiller density prior to ratooning and regrowth tiller density, with average regrowth temperature or regrowth degree days but linearly and negatively correlated with moisture regime, whether expressed as average parent-crop soil moisture prior to harvest, average regrowth soil moisture percentage or the summation of stress-free days. It was concluded that environmental limitations to growth in this environment, though relatively short lived, were significant in reducing long-term yields. Growth, however, was possible at all times.
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Claims 9
Claim · model-written summary
Elongation growth had a significant parabolic relation with crop age.
- Taxon
- Pennisetum purpureum
.jpg?width=60)
Cenchrus purpureust0 - Organ / stage
- crop agee0
- Outcome
- elongation growthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“elongation growth and averaged for the whole experimental period, was found to have a significant parabolic relationship with crop age and available soil moisture percentage”
t0“Pennisetum purpureum”
Claim · model-written summary
Elongation growth had a significant parabolic relation with soil moisture.
- Taxon
- Pennisetum purpureumCenchrus purpureust0
- Outcome
- elongation growthe0
- Setting
- available soil moisture percentagee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elongation growth and averaged for the whole experimental period, was found to have a significant parabolic relationship with crop age and available soil moisture percentage”
t0“Pennisetum purpureum”
Claim · model-written summary
Elongation growth did not have that relationship with average temperature or evaporation.
- Taxon
- Pennisetum purpureumCenchrus purpureust0
- Outcome
- elongation growthe2
- Setting
- average temperature or evaporatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not with average temperature or evaporation”
t0“Pennisetum purpureum”
e1“Regrowth yields were found to be linearly and positively correlated with tiller density prior to ratooning and regrowth tiller density”
e2“elongation growth and averaged for the whole experimental period, was found to have a significant parabolic relationship with crop age and available soil moisture percentage”
Claim · model-written summary
Regrowth yield correlated positively with tiller density before ratooning.
- Taxon
- Pennisetum purpureumCenchrus purpureust0
- Organ / stage
- tiller density prior to ratooninge0
- Outcome
- Regrowth yieldse0
- Direction
- positivelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regrowth yields were found to be linearly and positively correlated with tiller density prior to ratooning and regrowth tiller density”
t0“Pennisetum purpureum”
Claim · model-written summary
Regrowth yield correlated positively with regrowth tiller density.
- Taxon
- Pennisetum purpureumCenchrus purpureust0
- Organ / stage
- regrowth tiller densitye0
- Outcome
- Regrowth yieldse0
- Direction
- positivelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regrowth yields were found to be linearly and positively correlated with tiller density prior to ratooning and regrowth tiller density”
t0“Pennisetum purpureum”
Claim · model-written summary
Regrowth yield correlated positively with regrowth temperature or degree days.
- Taxon
- Pennisetum purpureumCenchrus purpureust0
- Outcome
- Regrowth yieldse1
- Setting
- average regrowth temperature or regrowth degree dayse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with average regrowth temperature or regrowth degree days but linearly and negatively correlated with moisture regime”
t0“Pennisetum purpureum”
e1“Regrowth yields were found to be linearly and positively correlated with tiller density prior to ratooning and regrowth tiller density”
Claim · model-written summary
Regrowth yield correlated negatively with moisture regime.
- Taxon
- Pennisetum purpureumCenchrus purpureust0
- Outcome
- Regrowth yieldse1
- Direction
- negativelye0
- Setting
- moisture regimee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“linearly and negatively correlated with moisture regime, whether expressed as average parent-crop soil moisture prior to harvest, average regrowth soil moisture percentage or the summation of stress-free days”
t0“Pennisetum purpureum”
e1“Regrowth yields were found to be linearly and positively correlated with tiller density prior to ratooning and regrowth tiller density”
Claim · model-written summary
Environmental limitations significantly reduced long-term yields.
- Taxon
- Pennisetum purpureumCenchrus purpureust0
- Outcome
- long-term yieldse0
- Direction
- reducinge0
- Setting
- this environmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“environmental limitations to growth in this environment, though relatively short lived, were significant in reducing long-term yields”
t0“Pennisetum purpureum”
Claim · model-written summary
Growth was possible at all times.
- Taxon
- Pennisetum purpureumCenchrus purpureust0
- Outcome
- Growth, however, was possible at all timese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth, however, was possible at all times”
t0“Pennisetum purpureum”