Abstract
No tillage often delays soil warming and drying, thus sowing too early in the spring may compromise seed viability due to prolonged exposure to cold and wet soil in the northern Corn Belt. Coating seed with a temperature‐activated polymer may circumvent the adverse effects of exposing seeds to cold and wet soil. Germination and emergence of noncoated and polymer‐coated corn ( Zea mays L.) and soybean [ Glycine max (L.) Merr.] seed as influenced by tillage and sowing date was examined near Morris, MN. Conventional and no tillage plots were split to accommodate early and late sowing‐date treatments while sowing‐date plots were split to accommodate seed coat treatments. Near‐surface soil water content and temperature, seed germination, and seedling emergence were monitored in 2000, 2001, and 2002. Germination of corn and soybean was delayed by as much as 6 and 11 d, respectively, as a result of sowing polymer‐coated vs. noncoated seed. This delay was also evidenced by polymer‐coated seed requiring more thermal time (>200°C h for corn and >1000°C h for soybean) to germinate and emerge than noncoated seed. Tillage, sowing date, and seed coating had little influence on plant population of corn. Sowing date and seed coating, however, influenced plant population of soybean in 2 out of 3 yr of this study. We surmise that polymer‐coated soybean seed produced a poorer stand as a result of exposure of the hypocotyl to lethal soil temperatures during emergence. This study suggests that temperature‐activated polymer coatings delay germination and emergence of corn and soybean.
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Claims 7
Claim · model-written summary
Polymer-coated corn seed germination was delayed by as much as 6 d relative to noncoated seed near Morris, MN.
- Taxon
- corn
Zea mays subsp. mayse1 - Treatment
- polymer‐coatede1
- Outcome
- Germinatione1
- Direction
- delayede1
- Value
- as much as 6 and 11 de1
- Comparator
- noncoatede1
- Setting
- Morris, MNe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Germination of corn and soybean was delayed by as much as 6 and 11 d, respectively, as a result of sowing polymer‐coated vs. noncoated seed”
e6“was examined near Morris, MN”
Claim · model-written summary
Polymer-coated soybean seed germination was delayed by as much as 11 d relative to noncoated seed near Morris, MN.
- Taxon
- soybean
Glycine maxe1 - Treatment
- polymer‐coatede1
- Outcome
- Germinatione1
- Direction
- delayede1
- Value
- as much as 6 and 11 de1
- Comparator
- noncoatede1
- Setting
- Morris, MNe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Germination of corn and soybean was delayed by as much as 6 and 11 d, respectively, as a result of sowing polymer‐coated vs. noncoated seed”
e6“was examined near Morris, MN”
Claim · model-written summary
Polymer-coated corn required more thermal time than noncoated seed to germinate and emerge.
- Taxon
- cornZea mays subsp. mayse2
- Treatment
- polymer‐coatede2
- Outcome
- thermal timee2
- Direction
- moree2
- Value
- >200°C he2
- Comparator
- noncoatede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“polymer‐coated seed requiring more thermal time (>200°C h for corn and >1000°C h for soybean) to germinate and emerge than noncoated seed”
Claim · model-written summary
Polymer-coated soybean required more thermal time than noncoated seed to germinate and emerge.
- Taxon
- soybeanGlycine maxe2
- Treatment
- polymer‐coatede2
- Outcome
- thermal timee2
- Direction
- moree2
- Value
- >1000°C he2
- Comparator
- noncoatede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“polymer‐coated seed requiring more thermal time (>200°C h for corn and >1000°C h for soybean) to germinate and emerge than noncoated seed”
Claim · model-written summary
Tillage, sowing date and seed coating had little influence on corn plant population.
- Taxon
- cornZea mays subsp. mayse3
- Treatment
- Tillage, sowing date, and seed coatinge3
- Outcome
- plant populatione3
- Direction
- little influencee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Tillage, sowing date, and seed coating had little influence on plant population of corn”
Claim · model-written summary
Sowing date and seed coating influenced soybean plant population in 2 of 3 years.
- Taxon
- soybeanGlycine maxe4
- Treatment
- Sowing date and seed coatinge4
- Outcome
- plant populatione4
- Qualifier
- 2 out of 3 yre4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Sowing date and seed coating, however, influenced plant population of soybean in 2 out of 3 yr of this study”
Claim · model-written summary
Polymer-coated soybean seed may have produced a poorer stand through hypocotyl exposure to lethal soil temperatures during emergence.
- Taxon
- soybeanGlycine maxe5
- Outcome
- poorer stande5
- Qualifier
- exposure of the hypocotyl to lethal soil temperatures during emergencee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“We surmise that polymer‐coated soybean seed produced a poorer stand as a result of exposure of the hypocotyl to lethal soil temperatures during emergence”
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