Abstract
Information about water management and crop stress response for red clover ( Trifolium pratense L.) seed production is limited. This study determined red clover seed crop water requirements and evaluated crop water stress index (CWSI) and fraction of available soil‐water used for timing supplemental irrigation. Experiments were conducted at Corvallis, OR, on a Woodburn silt loam (fine‐silty, mixed, mesic Aquultic Argixeroll) in 1990 and 1991. Six irrigation treatments were used to assess within‐ and between‐crop season water requirements. As a consequence of root disease in 1991, the fraction of availables oil water used by plants in the different treatments was generally less in 1991 than 1990. Also, seed production water‐use efficiency was lower in 1991 than 1990. Two distinct non‐stressed baselines for canopy‐air temperature differences versus vapor pressure deficit were identified that were related to increasing leaf senescence and crop aging. The CWSI values across all treatments were negatively associated with plant water potentials ( r = −0.87). The CWSI values were similar within similar treatments in both years indicating that root rot damage rather than available soil‐water was limiting plant water uptake in 1991. The CWSI generally increased faster than fraction of available soil‐water used. Unlike fraction of available soil‐water used, CWSI integrated the total plant environment, detecting changes due to root disease in 1991. Under the conditions of this experiment, a single irrigation filling the actives oil profile at CWSI ≈0.28 substantially increased seed yield compared with the nonirrigated control. The CWSI was a useful indicator of red clover water stress status and can be used to schedule clover seed irrigations under typical western Oregon climatic conditions.
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Claims 9
Claim · model-written summary
Root disease in 1991 accompanied lower use of available soil water.
- Taxon
- red clover
Trifolium pratenset0 - Outcome
- fraction of availables oil water used by plantse0
- Direction
- lesse0
- Comparator
- 1990e0
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As a consequence of root disease in 1991, the fraction of availables oil water used by plants in the different treatments was generally less in 1991 than 1990”
t0“Red Clover”
Claim · model-written summary
Seed production water-use efficiency was lower in 1991 than 1990.
- Taxon
- red cloverTrifolium pratenset0
- Outcome
- seed production water‐use efficiencye0
- Direction
- lowere0
- Comparator
- 1990e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed production water‐use efficiency was lower in 1991 than 1990”
t0“Red Clover”
Claim · model-written summary
Two non-stressed canopy temperature baselines related to leaf senescence and crop aging were identified.
- Taxon
- red cloverTrifolium pratenset0
- Outcome
- non‐stressed baselines for canopy‐air temperature differences versus vapor pressure deficite0
- Value
- Twoe0
- Qualifier
- increasing leaf senescence and crop aginge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two distinct non‐stressed baselines for canopy‐air temperature differences versus vapor pressure deficit were identified that were related to increasing leaf senescence and crop aging”
t0“Red Clover”
Claim · model-written summary
CWSI was negatively associated with plant water potential.
- Taxon
- red cloverTrifolium pratenset0
- Treatment
- CWSI valuese0
- Outcome
- plant water potentialse0
- Direction
- negativelye0
- Value
- r = −0.87e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CWSI values across all treatments were negatively associated with plant water potentials ( r = −0.87)”
t0“Red Clover”
Claim · model-written summary
CWSI values were similar for similar treatments in both years.
- Taxon
- red cloverTrifolium pratenset0
- Outcome
- CWSI valuese0
- Direction
- similare0
- Qualifier
- similar treatments in both yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CWSI values were similar within similar treatments in both years”
t0“Red Clover”
Claim · model-written summary
CWSI increased faster than the fraction of available soil water used.
- Taxon
- red cloverTrifolium pratenset0
- Outcome
- CWSIe0
- Direction
- increased fastere0
- Comparator
- fraction of available soil‐water usede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CWSI generally increased faster than fraction of available soil‐water used”
t0“Red Clover”
Claim · model-written summary
CWSI detected changes due to root disease unlike soil water fraction.
- Taxon
- red cloverTrifolium pratenset0
- Outcome
- detecting changes due to root diseasee0
- Comparator
- fraction of available soil‐water usede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Unlike fraction of available soil‐water used, CWSI integrated the total plant environment, detecting changes due to root disease in 1991”
t0“Red Clover”
Claim · model-written summary
A single irrigation at CWSI ≈0.28 substantially increased seed yield over no irrigation.
- Taxon
- red cloverTrifolium pratenset0
- Treatment
- a single irrigation filling the actives oil profile at CWSI ≈0.28e0
- Outcome
- seed yielde0
- Direction
- increasede0
- Comparator
- nonirrigated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a single irrigation filling the actives oil profile at CWSI ≈0.28 substantially increased seed yield compared with the nonirrigated control”
t0“Red Clover”
Claim · model-written summary
CWSI was useful for assessing red clover water stress and scheduling irrigation.
- Taxon
- red cloverTrifolium pratensee0
- Outcome
- red clover water stress statuse0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CWSI was a useful indicator of red clover water stress status and can be used to schedule clover seed irrigations under typical western Oregon climatic conditions”
The same questions in other papers
drought · yield · Trifolium pratense (red clover)Positive and negative results
3 in the opposite direction
- negative
- negative
- negative
irrigation · yield · Trifolium pratense (red clover)Results agree
6 papers in the same direction as this paper
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →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.