Abstract
Use of residual and contact herbicides was compared with cultivation for weed control on summerfallow on Regina heavy clay from 1964 to 1967, inclusive. A single spring application of desmetryne (2-isopropylamino-4-methylamino-6-methylthio-s-triazine) at 3 kg/ha gave 77 to 90% weed control without reducing wheat yields the following year. Disadvantages were incomplete weed control, and herbicide persistence in the soil with thinning of the following wheat crop in some years.Three or four applications of paraquat (1,1′-dimethyl-4,4-bipyridinium (salt)) at 1 kg/ha gave weed control equal to cultivation of summerfallow. Chemical summerfallow was equal to cultivated summerfallow in its effects on soil moisture conservation, NO 3 -N accumulation and crop yields. Chemical summerfallow conserved 91% of the original crop residues compared with 24% for cultivated summerfallow. This extra crop residue was sufficient to prevent serious soil erosion from wind. Paraquat is currently too expensive to compete with cultivation.
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Claims 11
Claim · model-written summary
Spring desmetryne application gave 77 to 90% weed control.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- desmetryne (2-isopropylamino-4-methylamino-6-methylthio-s-triazine) at 3 kg/hae0
- Interactor
- weede0weed
- Outcome
- weed controle0
- Value
- 77 to 90%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single spring application of desmetryne (2-isopropylamino-4-methylamino-6-methylthio-s-triazine) at 3 kg/ha gave 77 to 90% weed control”
e1“without reducing wheat yields the following year”
Claim · model-written summary
Desmetryne did not reduce wheat yields in the following year.
- Taxon
- wheatTriticum aestivume0
- Treatment
- desmetryne (2-isopropylamino-4-methylamino-6-methylthio-s-triazine) at 3 kg/hae0
- Outcome
- wheat yieldse0
- Direction
- without reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single spring application of desmetryne (2-isopropylamino-4-methylamino-6-methylthio-s-triazine) at 3 kg/ha gave 77 to 90% weed control without reducing wheat yields the following year”
Claim · model-written summary
Desmetryne gave incomplete weed control.
- Taxon
- wheatTriticum aestivume1
- Interactor
- weede0weed
- Outcome
- incomplete weed controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disadvantages were incomplete weed control”
e1“without reducing wheat yields the following year”
Claim · model-written summary
Persistent herbicide residues thinned the following wheat crop in some years.
- Taxon
- wheatTriticum aestivume0
- Treatment
- herbicide persistence in the soile0
- Outcome
- thinning of the following wheat crope0
- Qualifier
- in some yearse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“herbicide persistence in the soil with thinning of the following wheat crop in some years”
Claim · model-written summary
Three or four paraquat applications gave weed control equal to cultivation.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Three or four applications of paraquat (1,1′-dimethyl-4,4-bipyridinium (salt)) at 1 kg/hae0
- Interactor
- weede0weed
- Outcome
- weed controle0
- Direction
- equal toe0
- Comparator
- cultivation of summerfallowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Three or four applications of paraquat (1,1′-dimethyl-4,4-bipyridinium (salt)) at 1 kg/ha gave weed control equal to cultivation of summerfallow”
e1“wheat yields the following year”
Claim · model-written summary
Chemical and cultivated summerfallow conserved soil moisture equally.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Chemical summerfallowe0
- Outcome
- soil moisture conservatione0
- Direction
- equal toe0
- Comparator
- cultivated summerfallowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chemical summerfallow was equal to cultivated summerfallow in its effects on soil moisture conservation, NO 3 -N accumulation and crop yields”
e1“wheat yields the following year”
Claim · model-written summary
Chemical and cultivated summerfallow had equal effects on soil NO3-N accumulation.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Chemical summerfallowe0
- Outcome
- NO 3 -N accumulatione0
- Direction
- equal toe0
- Comparator
- cultivated summerfallowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chemical summerfallow was equal to cultivated summerfallow in its effects on soil moisture conservation, NO 3 -N accumulation and crop yields”
e1“wheat yields the following year”
Claim · model-written summary
Chemical and cultivated summerfallow produced equal crop yields.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Chemical summerfallowe0
- Outcome
- crop yieldse0
- Direction
- equal toe0
- Comparator
- cultivated summerfallowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chemical summerfallow was equal to cultivated summerfallow in its effects on soil moisture conservation, NO 3 -N accumulation and crop yields”
e1“wheat yields the following year”
Claim · model-written summary
Chemical summerfallow conserved 91% of original crop residues versus 24% under cultivated summerfallow.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Chemical summerfallowe0
- Outcome
- original crop residuese0
- Direction
- compared withe0
- Value
- 91%e0
- Qualifier
- 24%e0
- Comparator
- cultivated summerfallowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chemical summerfallow conserved 91% of the original crop residues compared with 24% for cultivated summerfallow”
e1“wheat yields the following year”
Claim · model-written summary
The extra crop residue prevented serious wind erosion.
- Taxon
- wheatTriticum aestivume1
- Outcome
- soil erosion from winde0
- Direction
- prevente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This extra crop residue was sufficient to prevent serious soil erosion from wind”
e1“wheat yields the following year”
Claim · model-written summary
Paraquat was too expensive to compete with cultivation.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Paraquate0
- Outcome
- too expensive to compete with cultivatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Paraquat is currently too expensive to compete with cultivation”
e1“wheat yields the following year”
The same questions in other papers
paraquat · weed · Triticum aestivum (wheat)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- negative
- 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.