Abstract
A study was conducted at three locations in Saskatchewan, Canada, in 1996 and 1997 to determine if increasing the seeding rate of wheat, barley, and lentil by 50% would maintain weed control and crop yield when herbicides are applied at reduced rates or not at all. Three herbicide rates (½ of full, ¾ of full, and full recommended label rate), along with an untreated check, two crop seeding rates (normally recommended and 1.5 times normally recommended rates), and three crops were tested. Increasing seeding rate did not affect weed fresh weights, crop yield, and net return responses to herbicides applied at reduced rates or not at all when averaged across crops, years, and locations. Increased seeding rate, independent of the different herbicide applications, had infrequent and inconsistent effects among the crop by year by location combinations. More broadleaf and grass weed growth, less crop yield, and lower net returns generally occurred when herbicides were not applied or applied at reduced rates. These trends were especially prominent when herbicides were not applied to cereal crops at Saskatoon (40% yield reduction) and when herbicides were applied at ½ the full label rate rather than higher herbicide rates to wheat at the other two locations (16% yield reduction). In 1996, lentil yield and net returns did not respond to herbicide application and rate because of poor grass weed control across all herbicide rates. Lentil yield and net returns decreased by 11% (full vs. ¾), 22% (¾ vs. ½), and 46% (½ vs. none) when herbicides were applied at progressively lower rates in 1997. Reduced herbicide rates did not affect net returns for cereal crops, indicating that herbicide rates lower than the full label rate may be economically viable in certain crops.Nomenclature: Barley, Hordeum vulgare L.; hard red spring wheat, Triticum aestivum L.; lentil, Lens culinaris Medic.Additional index words: Integrated weed management, weed interference, economic return.
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Claims 13
Claim · model-written summary
Increasing seeding rate did not affect weed weights, yield or net return responses to reduced or absent herbicide.
- Taxon
- Cropt0
- Treatment
- Increasing seeding ratee0
- Outcome
- weed fresh weights, crop yield, and net return responsese0
- Direction
- did not affecte0
Not reportedComparator
Verbatim
e0“Increasing seeding rate did not affect weed fresh weights, crop yield, and net return responses to herbicides applied at reduced rates or not at all when averaged across crops, years, and locations.”
t0“Crop”
Claim · model-written summary
Higher seeding rate had infrequent and inconsistent effects across crop, year and location combinations.
Not reportedComparatorDirection
Verbatim
e0“Increased seeding rate, independent of the different herbicide applications, had infrequent and inconsistent effects among the crop by year by location combinations.”
t0“Crop”
Claim · model-written summary
Absent or reduced herbicides generally allowed more broadleaf and grass weed growth.
- Taxon
- Cropt0
- Treatment
- herbicides were not applied or applied at reduced ratese0
- Interactor
- broadleaf and grass weede0weed
- Outcome
- broadleaf and grass weed growthe0
- Direction
- Moree0
Not reportedComparator
Verbatim
e0“More broadleaf and grass weed growth, less crop yield, and lower net returns generally occurred when herbicides were not applied or applied at reduced rates.”
t0“Crop”
Claim · model-written summary
Absent or reduced herbicides generally reduced crop yield.
- Taxon
- Cropt0
- Treatment
- herbicides were not applied or applied at reduced ratese0
- Outcome
- crop yielde0
- Direction
- lesse0
Not reportedComparator
Verbatim
e0“More broadleaf and grass weed growth, less crop yield, and lower net returns generally occurred when herbicides were not applied or applied at reduced rates.”
t0“Crop”
Claim · model-written summary
Absent or reduced herbicides generally lowered net returns.
- Taxon
- Cropt0
- Treatment
- herbicides were not applied or applied at reduced ratese0
- Outcome
- net returnse0
- Direction
- lowere0
Not reportedComparator
Verbatim
e0“More broadleaf and grass weed growth, less crop yield, and lower net returns generally occurred when herbicides were not applied or applied at reduced rates.”
t0“Crop”
Claim · model-written summary
With no herbicide, cereal crop yield at Saskatoon fell 40%.
- Taxon
- cereal cropse0
- Treatment
- herbicides were not appliede0
- Outcome
- yielde0
- Direction
- reductione0
- Value
- 40%e0
- Setting
- Saskatoone0
Not reportedComparator
Verbatim
e0“herbicides were not applied to cereal crops at Saskatoon (40% yield reduction)”
Claim · model-written summary
Half-rate herbicide reduced wheat yield 16% compared with higher rates at two locations.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- ½ the full label ratee0
- Outcome
- yielde0
- Direction
- reductione0
- Value
- 16%e0
- Comparator
- higher herbicide ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“herbicides were applied at ½ the full label rate rather than higher herbicide rates to wheat at the other two locations (16% yield reduction).”
Claim · model-written summary
In 1996, lentil yield and net returns did not respond to herbicide application or rate.
- Taxon
- lentil
Lens culinarise0 - Treatment
- herbicide application and ratee0
- Outcome
- yield and net returnse0
- Direction
- did not responde0
- Qualifier
- poor grass weed control across all herbicide ratese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1996, lentil yield and net returns did not respond to herbicide application and rate because of poor grass weed control across all herbicide rates.”
Claim · model-written summary
In 1997, lentil yield and net returns fell 11% at three-quarter versus full rate.
- Taxon
- LentilLens culinarise0
- Treatment
- ¾e0
- Outcome
- yield and net returnse0
- Direction
- decreasede0
- Value
- 11%e0
- Comparator
- fulle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lentil yield and net returns decreased by 11% (full vs. ¾), 22% (¾ vs. ½), and 46% (½ vs. none) when herbicides were applied at progressively lower rates in 1997.”
Claim · model-written summary
In 1997, lentil yield and net returns fell 22% at half versus three-quarter rate.
- Taxon
- LentilLens culinarise0
- Treatment
- ½e0
- Outcome
- yield and net returnse0
- Direction
- decreasede0
- Value
- 22%e0
- Comparator
- ¾e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lentil yield and net returns decreased by 11% (full vs. ¾), 22% (¾ vs. ½), and 46% (½ vs. none) when herbicides were applied at progressively lower rates in 1997.”
Claim · model-written summary
In 1997, lentil yield and net returns fell 46% with no herbicide versus half rate.
- Taxon
- LentilLens culinarise0
- Treatment
- nonee0
- Outcome
- yield and net returnse0
- Direction
- decreasede0
- Value
- 46%e0
- Comparator
- ½e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lentil yield and net returns decreased by 11% (full vs. ¾), 22% (¾ vs. ½), and 46% (½ vs. none) when herbicides were applied at progressively lower rates in 1997.”
Claim · model-written summary
Reduced herbicide rates did not affect cereal net returns.
Not reportedComparator
Verbatim
e0“Reduced herbicide rates did not affect net returns for cereal crops”
Claim · model-written summary
Below-label herbicide rates may be economically viable in certain crops.
Verbatim
e0“herbicide rates lower than the full label rate may be economically viable in certain crops.”
The same questions in other papers
label · yield · Triticum aestivum (wheat)Positive and negative results
3 papers in the same direction as this paper · 4 in the opposite direction
- negative
- positive
- positive
4 papers more in this group
See all 8 papers →herbicide · yield · Lens culinaris (lentil)Results differ
10 papers in the same direction as this paper · 36 in the opposite direction
- positive
- positive
- positive
43 papers more in this group
See all 47 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.