Abstract
Summary The influence of rain and drought before, and air temperature during, weed control with hot water was studied in laboratory experiments on the test weed Sinapis alba (white mustard). The plants were grown in a greenhouse and treated outdoors. There was no difference in weed control effect when S. alba plants at the four‐leaf stage were treated at the air temperatures 7°C and 18 ∘ C. The effective energy dose for a 90% fresh weight reduction was 465 kJ m −2 for both air temperatures. Weed control of S. alba at the four‐ to six‐leaf stage in rainfall above the rainwater run‐off level increased the required effective energy dose by 20% (i.e. 120 kJ m −2 ) compared with dry plants. A short period of drought just before treatment on S. alba at the two‐ to four‐leaf stage increased the plant fresh weight reduction, which was 22% at low energy dose (190 kJ m −2 ) and 44% at high energy dose (360 kJ m −2 ). Hot water weed control should thus be carried out when the plants are drought stressed and avoided when the plants are wet. The air temperature seems to be of little importance in the range 7–18 ∘ C.
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Claims 6
Claim · model-written summary
Weed control at 7°C and 18°C did not differ for four-leaf Sinapis alba.
- Taxon
- Sinapis alba
Sinapis albae1 - Organ / stage
- four‐leaf stagee0
- Treatment
- 7°Ce0
- Outcome
- weed control effecte0
- Direction
- no differencee0
- Comparator
- 18 ∘ Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no difference in weed control effect when S. alba plants at the four‐leaf stage were treated at the air temperatures 7°C and 18 ∘ C.”
e1“test weed Sinapis alba (white mustard)”
Claim · model-written summary
A 90% fresh weight reduction required 465 kJ m −2 at both tested temperatures.
- Taxon
- Sinapis albaSinapis albae1
- Outcome
- fresh weight reductione0
- Value
- 465 kJ m −2e0
- Qualifier
- 90%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effective energy dose for a 90% fresh weight reduction was 465 kJ m −2 for both air temperatures.”
e1“test weed Sinapis alba (white mustard)”
Claim · model-written summary
Rainfall above runoff raised the required energy dose by 20% compared with dry plants.
- Taxon
- Sinapis albaSinapis albae1
- Treatment
- rainfall above the rainwater run‐off levele0
- Outcome
- required effective energy dosee0
- Direction
- increasede0
- Value
- 20%e0
- Qualifier
- 120 kJ m −2e0
- Comparator
- dry plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rainfall above the rainwater run‐off level increased the required effective energy dose by 20% (i.e. 120 kJ m −2 ) compared with dry plants.”
e1“test weed Sinapis alba (white mustard)”
Claim · model-written summary
Brief drought increased fresh weight reduction by 22% at low energy dose.
- Taxon
- Sinapis albaSinapis albae1
- Treatment
- A short period of droughte0
- Outcome
- plant fresh weight reductione0
- Direction
- increasede0
- Value
- 22%e0
- Qualifier
- low energy dose (190 kJ m −2 )e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A short period of drought just before treatment on S. alba at the two‐ to four‐leaf stage increased the plant fresh weight reduction, which was 22% at low energy dose (190 kJ m −2 ) and 44% at high energy dose (360 kJ m −2 ).”
e1“test weed Sinapis alba (white mustard)”
Claim · model-written summary
Brief drought increased fresh weight reduction by 44% at high energy dose.
- Taxon
- Sinapis albaSinapis albae1
- Treatment
- A short period of droughte0
- Outcome
- plant fresh weight reductione0
- Direction
- increasede0
- Value
- 44%e0
- Qualifier
- high energy dose (360 kJ m −2 )e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A short period of drought just before treatment on S. alba at the two‐ to four‐leaf stage increased the plant fresh weight reduction, which was 22% at low energy dose (190 kJ m −2 ) and 44% at high energy dose (360 kJ m −2 ).”
e1“test weed Sinapis alba (white mustard)”
Claim · model-written summary
The authors recommend hot water treatment during drought stress and avoiding wet plants.
- Taxon
- Sinapis albaSinapis albae1
- Outcome
- Hot water weed control should thus be carried out when the plants are drought stressed and avoided when the plants are wete0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hot water weed control should thus be carried out when the plants are drought stressed and avoided when the plants are wet.”
e1“test weed Sinapis alba (white mustard)”
The same questions in other papers
drought · growth · Sinapis alba (white mustard)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
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.