Abstract
Field studies on Prince Edward Island loam to fine sandy loam soils from 1977–1980 evaluated the rate of breakdown of metribuzin (4-amino-6-tert-butyl-3-(methylthio)-as-triazin-5(4H)-one) and soil residue effects on crops grown in rotation with potatoes (Solanum tuberosum L.). Yields of winter rye (Secale cereale L.) seeded in September and red clover (Trifolium pratense L.) seeded in spring were not reduced with metribuzin applied at rates of 0.5, 1.0, and 1.5 kg/ha to the preceding potato crop. Yields of barley (Hordeum vulgare L.) and timothy (Phleum pratense L.) seeded the next spring after metribuzin were significantly reduced in the first experiment at applied rates of 1.0 and 0.5 kg/ha, respectively, but not in the other two experiments. Barley and timothy yields apparently were reduced in the second but not the third experiment at an applied rate of 1.5 kg/ha. The rate of breakdown of metribuzin was rapid in all three experiments but slower in 1977 than in the other 2 yr. The half-life of metribuzin averaged over rates applied was 39 days in 1977, 32 days in 1978, and 30 days in 1979 in P.E.I. soils. From these data, it is doubtful that metribuzin will persist in sufficient amounts in P.E.I. soils to adversely affect crops of winter rye or red clover grown in rotation but may result in some yield reduction of barley at the high rate of application of 1.0 kg/ha and reduction in timothy yield at applied rate of 0.5 kg/ha in those years when rate of breakdown was slow.Key words: Metribuzin, residue, red clover, timothy, winter rye, barley
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Claims 10
Claim · model-written summary
Winter rye yield was not reduced after metribuzin at 0.5, 1.0 or 1.5 kg/ha on the preceding potato crop.
- Taxon
- winter rye
Secale cerealee0 - Treatment
- metribuzin applied at rates of 0.5, 1.0, and 1.5 kg/hae0
- Outcome
- Yields of winter ryee0
- Direction
- not reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of winter rye (Secale cereale L.) seeded in September and red clover (Trifolium pratense L.) seeded in spring were not reduced with metribuzin applied at rates of 0.5, 1.0, and 1.5 kg/ha to the preceding potato crop”
Claim · model-written summary
Red clover yield was not reduced after metribuzin at 0.5, 1.0 or 1.5 kg/ha on the preceding potato crop.
- Taxon
- red clover
Trifolium pratensee0 - Treatment
- metribuzin applied at rates of 0.5, 1.0, and 1.5 kg/hae0
- Outcome
- Yields of winter rye (Secale cereale L.) seeded in September and red clovere0
- Direction
- not reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of winter rye (Secale cereale L.) seeded in September and red clover (Trifolium pratense L.) seeded in spring were not reduced with metribuzin applied at rates of 0.5, 1.0, and 1.5 kg/ha to the preceding potato crop”
Claim · model-written summary
Barley yield was significantly reduced at 1.0 kg/ha in the first experiment.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- metribuzine0
- Outcome
- Yields of barleye0
- Direction
- reducede0
- Value
- 1.0e0
- Qualifier
- first experimente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Yields of barley (Hordeum vulgare L.) and timothy (Phleum pratense L.) seeded the next spring after metribuzin were significantly reduced in the first experiment at applied rates of 1.0 and 0.5 kg/ha, respectively, but not in the other two experiments”
Claim · model-written summary
Timothy yield was significantly reduced at 0.5 kg/ha in the first experiment.
- Taxon
- timothy
Phleum pratensee0 - Treatment
- metribuzine0
- Outcome
- Yields of barley (Hordeum vulgare L.) and timothye0
- Direction
- reducede0
- Value
- 0.5 kg/hae0
- Qualifier
- first experimente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of barley (Hordeum vulgare L.) and timothy (Phleum pratense L.) seeded the next spring after metribuzin were significantly reduced in the first experiment at applied rates of 1.0 and 0.5 kg/ha, respectively, but not in the other two experiments”
Claim · model-written summary
Barley yield apparently declined at 1.5 kg/ha in the second but not the third experiment.
- Taxon
- BarleyHordeum vulgaree0
- Treatment
- 1.5 kg/hae0
- Outcome
- Barley and timothy yieldse0
- Direction
- reducede0
- Qualifier
- second but not the third experimente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Barley and timothy yields apparently were reduced in the second but not the third experiment at an applied rate of 1.5 kg/ha”
Claim · model-written summary
Timothy yield apparently declined at 1.5 kg/ha in the second but not the third experiment.
- Taxon
- timothyPhleum pratensee0
- Treatment
- 1.5 kg/hae0
- Outcome
- Barley and timothy yieldse0
- Direction
- reducede0
- Qualifier
- second but not the third experimente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Barley and timothy yields apparently were reduced in the second but not the third experiment at an applied rate of 1.5 kg/ha”
Claim · model-written summary
Metribuzin broke down rapidly but more slowly in 1977 than in the other two years.
Not reportedTaxon
Verbatim
e0“The rate of breakdown of metribuzin was rapid in all three experiments but slower in 1977 than in the other 2 yr”
Claim · model-written summary
Metribuzin half-life was 39 days in 1977.
Not reportedTaxon
Verbatim
e0“The half-life of metribuzin averaged over rates applied was 39 days in 1977, 32 days in 1978, and 30 days in 1979 in P.E.I. soils”
Claim · model-written summary
Metribuzin half-life was 32 days in 1978.
Not reportedTaxon
Verbatim
e0“The half-life of metribuzin averaged over rates applied was 39 days in 1977, 32 days in 1978, and 30 days in 1979 in P.E.I. soils”
Claim · model-written summary
Metribuzin half-life was 30 days in 1979.
Not reportedTaxon
Verbatim
e0“The half-life of metribuzin averaged over rates applied was 39 days in 1977, 32 days in 1978, and 30 days in 1979 in P.E.I. soils”
The same questions in other papers
metribuzin · yield · Secale cereale (rye)Results differ
1 in the opposite direction
- positive
metribuzin · yield · Hordeum vulgare (barley)Results agree
1 paper in the same direction as this paper
- negative
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.