Abstract
Core Ideas Higher prohexadione rates of 0.5 to 1 kg a.i. ha –1 enhanced interseeded alfalfa establishment and yield under stressful establishment conditions. Prohexadione application to 15 vs. 25 cm tall alfalfa seedlings provided similar improvements in alfalfa stand density and yield. Interseeding alfalfa increased overall corn+alfalfa forage production by 12%. Prohexadione‐calcium (PHD) can enhance establishment of alfalfa ( Medicago sativa L.) interseeded into silage corn ( Zea mays L.), but optimal application rates and timing for this growth regulator are unknown. Two experiments examined how single or split applications of 0.25 to 1.0 kg a.i. ha −1 of PHD applied to 15 or 25 cm tall glyphosate‐resistant alfalfa seedlings influenced growth, stand density, and yield of alfalfa and corn compared to untreated controls. The PHD treatments reduced seedling top growth by 13 to 32% and increased stand density of alfalfa by 19 to 81% in three out of four locations and alfalfa dry matter yield by 4 to 23% in two out of four locations the following year. Alfalfa responses were not consistently influenced by the rate and timing of PHD application, but higher rates proved advantageous under conditions that impaired alfalfa seedling survival under corn. Application of PHD on alfalfa had little or no effect on corn heights and yields. Corn population and alfalfa seeding rates influenced corn silage yield and alfalfa stand counts in at least one location, but these factors had little effect on crop responses to PHD. Combined 2‐yr yields of corn followed by alfalfa were 12% greater for the interseeding system than for solo‐seeded corn followed by spring seeded alfalfa. Overall, a single application of 0.5 to 1.0 kg a.i. ha −1 of PHD on 15 to 25 cm tall alfalfa proved effective for improving stand density and occasionally first year yield of glyphosate‐resistant alfalfa.
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Claims 10
Claim · model-written summary
PHD reduced alfalfa seedling top growth by 13 to 32%.
Not reportedTaxonComparator
Verbatim
e0“The PHD treatments reduced seedling top growth by 13 to 32%”
Claim · model-written summary
PHD increased alfalfa stand density by 19 to 81% in three of four locations.
- Taxon
- alfalfa
Medicago sativae0 - Outcome
- stand densitye0
- Direction
- increasede0
- Value
- 19 to 81%e0
- Qualifier
- three out of four locationse0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased stand density of alfalfa by 19 to 81% in three out of four locations”
Claim · model-written summary
PHD increased alfalfa dry matter yield by 4 to 23% at two locations.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- dry matter yielde0
- Value
- 4 to 23%e0
- Qualifier
- two out of four locations the following yeare0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa dry matter yield by 4 to 23% in two out of four locations the following year”
Claim · model-written summary
Alfalfa response was not consistently influenced by PHD rate or timing.
- Taxon
- AlfalfaMedicago sativae0
- Outcome
- Alfalfa responsese0
- Direction
- not consistently influencede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa responses were not consistently influenced by the rate and timing of PHD application”
Claim · model-written summary
Higher rates helped when alfalfa seedling survival under corn was impaired.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- alfalfa seedling survivale0
- Direction
- advantageouse0
- Qualifier
- under corne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher rates proved advantageous under conditions that impaired alfalfa seedling survival under corn”
Claim · model-written summary
PHD on alfalfa had little or no effect on corn heights and yields.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Application of PHD on alfalfae0
- Outcome
- corn heights and yieldse0
- Direction
- little or no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of PHD on alfalfa had little or no effect on corn heights and yields”
Claim · model-written summary
Corn population and alfalfa seeding rates influenced silage yield and stand counts at least one location.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- Corn population and alfalfa seeding ratese0
- Outcome
- corn silage yield and alfalfa stand countse0
- Qualifier
- at least one locatione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn population and alfalfa seeding rates influenced corn silage yield and alfalfa stand counts in at least one location”
Claim · model-written summary
These factors had little effect on crop responses to PHD.
Not reportedTaxonComparator
Verbatim
e0“these factors had little effect on crop responses to PHD”
Claim · model-written summary
Interseeding raised combined two-year corn and alfalfa yields by 12%.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- interseeding systeme0
- Outcome
- Combined 2‐yr yieldse0
- Direction
- greatere0
- Value
- 12%e0
- Comparator
- solo‐seeded corn followed by spring seeded alfalfae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combined 2‐yr yields of corn followed by alfalfa were 12% greater for the interseeding system than for solo‐seeded corn followed by spring seeded alfalfa”
Claim · model-written summary
A single PHD application of 0.5 to 1.0 kg a.i. ha −1 to 15 to 25 cm alfalfa improved stands and sometimes first-year yield.
- Taxon
- alfalfaMedicago sativae0
- Material
- glyphosate‐resistant alfalfae0
- Treatment
- a single application of 0.5 to 1.0 kg a.i. ha −1 of PHDe0
- Outcome
- improving stand density and occasionally first year yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a single application of 0.5 to 1.0 kg a.i. ha −1 of PHD on 15 to 25 cm tall alfalfa proved effective for improving stand density and occasionally first year yield of glyphosate‐resistant alfalfa”
The same questions in other papers
Medicago sativa · yield · Zea mays (maize)Positive and negative results
5 papers in the same direction as this paper · 28 in the opposite direction
- positive
- negative
- negative
30 papers more in this group
See all 34 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.