Abstract
Abstract Kansas growers wish to improve broadleaf weed control in soybeans [ Glycine max (L.) Merr.] grown in sandy soils with high pH or low organic matter content. Metribuzin [4‐amino‐6‐ tert ‐butyl‐3‐(methylthio)‐as‐triazin‐5 (4 H )‐one] applications would effectively control broadleaf weeds on such soils; however, crop injury risk would also be present. Thus, a field experiment was initiated to determne if a 3‐week interval between herbicide application and planting or cultivation after soybean emergence improved tolerance of soybeans grown on a soil with a high pH and low organic matter content. Metribuzin was applied at 0.6 or 1.1 kg/ha and incorporated prior to soybean planting in a Haynie very fine sandy loam (coarse‐silty, mixed, calcareous, mesic Typic Udifluvent) with pH of 7.9 and 0.7% organic matter content in 1978 and 1979. Visual injury of 4‐week‐old plants was less in 1978 but more in 1979 when metribuzin was applied 3 weeks before planting rather than immediately before planting. Injury in 7‐week‐old plants was not significantly affected by time of metribuzin applications in 1978 but was greater from applications immediately before planting compared to applications 3 weeks prior to planting in 1979. Injury differences were attributed to rainfall quantity and pattern. The meribuzin applications at 0.6 or 1.1 kg/ha 3 weeks prior to planting did not affect soybean yields either year even though the higher rate reduced plant stand and plant height. Yields were reduced only when metribuzin was applied at the higher rate immediately before planting. Cultivation at 3 and 7 weeks after soybean planting did not significantly affect soybean tolerance either year.
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Claims 9
Claim · model-written summary
Applying metribuzin three weeks before planting caused less visual injury in 1978 than immediate application.
- Taxon
- soybeans
Glycine maxt0 - Treatment
- metribuzin was applied 3 weeks before plantinge0
- Outcome
- Visual injurye0
- Direction
- lesse0
- Qualifier
- 1978e0
- Comparator
- immediately before plantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Visual injury of 4‐week‐old plants was less in 1978 but more in 1979 when metribuzin was applied 3 weeks before planting rather than immediately before planting”
t0“Soybeans”
Claim · model-written summary
Applying metribuzin three weeks before planting caused more visual injury in 1979 than immediate application.
- Taxon
- soybeansGlycine maxt0
- Treatment
- metribuzin was applied 3 weeks before plantinge0
- Outcome
- Visual injurye0
- Direction
- moree0
- Qualifier
- 1979e0
- Comparator
- immediately before plantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Visual injury of 4‐week‐old plants was less in 1978 but more in 1979 when metribuzin was applied 3 weeks before planting rather than immediately before planting”
t0“Soybeans”
Claim · model-written summary
Application timing did not significantly affect injury of seven-week-old plants in 1978.
- Taxon
- soybeansGlycine maxt0
- Treatment
- time of metribuzin applicationse0
- Outcome
- Injurye0
- Direction
- not significantly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Injury in 7‐week‐old plants was not significantly affected by time of metribuzin applications in 1978”
t0“Soybeans”
Claim · model-written summary
Immediate preplant metribuzin caused greater injury of seven-week-old plants in 1979.
- Taxon
- soybeansGlycine maxt0
- Treatment
- applications immediately before plantinge0
- Outcome
- Injurye0
- Direction
- greatere0
- Qualifier
- 1979e0
- Comparator
- applications 3 weeks prior to plantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Injury in 7‐week‐old plants was not significantly affected by time of metribuzin applications in 1978 but was greater from applications immediately before planting compared to applications 3 weeks prior to planting in 1979”
t0“Soybeans”
Claim · model-written summary
Metribuzin applied three weeks before planting did not affect yield in either year.
- Taxon
- soybeanGlycine maxe0
- Treatment
- meribuzin applications at 0.6 or 1.1 kg/ha 3 weeks prior to plantinge0
- Outcome
- soybean yieldse0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“meribuzin applications at 0.6 or 1.1 kg/ha 3 weeks prior to planting did not affect soybean yields either year”
Claim · model-written summary
The higher metribuzin rate reduced plant stand.
- Taxon
- soybeansGlycine maxt0
- Treatment
- higher ratee0
- Outcome
- plant stande0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the higher rate reduced plant stand and plant height”
t0“Soybeans”
Claim · model-written summary
The higher metribuzin rate reduced plant height.
- Taxon
- soybeansGlycine maxt0
- Treatment
- higher ratee0
- Outcome
- plant heighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the higher rate reduced plant stand and plant height”
t0“Soybeans”
Claim · model-written summary
The higher rate applied immediately before planting reduced yield.
- Taxon
- soybeansGlycine maxt0
- Treatment
- metribuzin was applied at the higher rate immediately before plantinge0
- Outcome
- Yieldse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields were reduced only when metribuzin was applied at the higher rate immediately before planting”
t0“Soybeans”
Claim · model-written summary
Cultivation at three and seven weeks after planting did not significantly affect soybean tolerance.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Cultivation at 3 and 7 weeks after soybean plantinge0
- Outcome
- soybean tolerancee0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivation at 3 and 7 weeks after soybean planting did not significantly affect soybean tolerance either year”
The same questions in other papers
metribuzin · yield · Glycine max (soybean)Results differ
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- negative
- negative
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See all 61 papers →metribuzin · crop injury · Glycine max (soybean)Positive and negative results
4 papers in the same direction as this paper · 18 in the opposite direction
- negative
- negative
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See all 23 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.