Abstract
Field-scale experiments were conducted at several western Canada locations to determine the importance of early weed removal over variable landscapes. In eight of 10 cases, imidazolinone-resistant (IR) canola yield decreased linearly as herbicide application (15/15 g/ha imazamox/imazethapyr or 15/15 g/ha imazamox/imazethapyr plus 150 g/ha clopyralid) was delayed beyond the one- to two-leaf stage. In two of 10 cases, canola oil content also decreased as herbicide treatment was delayed. Canola yields at all environments (location by year combinations) averaged 2,073, 1,872, or 1,650 kg/ha when treated at the one- to two-, three- to five-, or six- to seven-leaf stage, respectively. Assuming canola prices from a low of $250/t to a high of $650/t, growers could lose $50 to $131/ha, respectively, by delaying herbicide application from the one- to two- to the three- to five-leaf stage, or $106 to $275/ha, respectively, by delaying herbicide application from the one- to two- to the six- to seven-leaf stage.
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Claims 7
Claim · model-written summary
IR canola yield decreased as herbicide application was delayed beyond the one- to two-leaf stage in eight of 10 cases
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse0 - Material
- imidazolinone-resistant (IR)e0
- Treatment
- herbicide applicatione0
- Outcome
- yielde0
- Direction
- decreasede0
- Qualifier
- In eight of 10 casese0
- Comparator
- one- to two-leaf stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“In eight of 10 cases, imidazolinone-resistant (IR) canola yield decreased linearly as herbicide application (15/15 g/ha imazamox/imazethapyr or 15/15 g/ha imazamox/imazethapyr plus 150 g/ha clopyralid) was delayed beyond the one- to two-leaf stage”
Claim · model-written summary
Canola oil content decreased as herbicide treatment was delayed in two of 10 cases
- Taxon
- canolaBrassica napus var. napuse1
- Treatment
- herbicide treatmente1
- Outcome
- oil contente1
- Direction
- decreasede1
- Qualifier
- In two of 10 casese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In two of 10 cases, canola oil content also decreased as herbicide treatment was delayed”
Claim · model-written summary
Canola yield averaged 2,073 when treated at the one- to two-leaf stage
- Taxon
- CanolaBrassica napus var. napuse2
- Treatment
- treated at the one- to two-e2
- Outcome
- yieldse2
- Value
- 2,073e2
- Setting
- all environmentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Canola yields at all environments (location by year combinations) averaged 2,073, 1,872, or 1,650 kg/ha when treated at the one- to two-, three- to five-, or six- to seven-leaf stage, respectively”
Claim · model-written summary
Canola yield averaged 1,872 when treated at the three- to five-leaf stage
- Taxon
- CanolaBrassica napus var. napuse2
- Treatment
- three- to five-e2
- Outcome
- yieldse2
- Value
- 1,872e2
- Setting
- all environmentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Canola yields at all environments (location by year combinations) averaged 2,073, 1,872, or 1,650 kg/ha when treated at the one- to two-, three- to five-, or six- to seven-leaf stage, respectively”
Claim · model-written summary
Canola yield averaged 1,650 when treated at the six- to seven-leaf stage
- Taxon
- CanolaBrassica napus var. napuse2
- Treatment
- six- to seven-e2
- Outcome
- yieldse2
- Value
- 1,650e2
- Setting
- all environmentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Canola yields at all environments (location by year combinations) averaged 2,073, 1,872, or 1,650 kg/ha when treated at the one- to two-, three- to five-, or six- to seven-leaf stage, respectively”
Claim · model-written summary
Delaying herbicide application from the one- to two- to the three- to five-leaf stage could cost growers $50 to $131/ha
- Taxon
- canolaBrassica napus var. napuse3
- Treatment
- delaying herbicide application from the one- to two- to the three- to five-leaf stagee3
- Outcome
- growers could losee3
- Direction
- decreaseinferrede3
- Value
- $50 to $131/hae3
- Qualifier
- Assuming canola prices from a low of $250/t to a high of $650/te3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Assuming canola prices from a low of $250/t to a high of $650/t, growers could lose $50 to $131/ha, respectively, by delaying herbicide application from the one- to two- to the three- to five-leaf stage”
Claim · model-written summary
Delaying herbicide application from the one- to two- to the six- to seven-leaf stage could cost growers $106 to $275/ha
- Taxon
- canolaBrassica napus var. napuse3
- Treatment
- delaying herbicide application from the one- to two- to the six- to seven-leaf stagee4
- Outcome
- growers could losee3
- Direction
- decreaseinferrede3
- Value
- $106 to $275/hae4
- Qualifier
- Assuming canola prices from a low of $250/t to a high of $650/te3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Assuming canola prices from a low of $250/t to a high of $650/t, growers could lose $50 to $131/ha, respectively, by delaying herbicide application from the one- to two- to the three- to five-leaf stage”
e4“or $106 to $275/ha, respectively, by delaying herbicide application from the one- to two- to the six- to seven-leaf stage”
The same questions in other papers
herbicide · yield · Brassica napus (oilseed rape)Results differ
18 papers in the same direction as this paper · 32 in the opposite direction
- positive
- positive
- positive
47 papers more in this group
See all 51 papers →herbicide · quality: oil · Brassica napus (oilseed rape)Positive and negative results
2 in the opposite direction
- positive
- 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.