Abstract
Glyphosate [ N ‐(phosphonomethyl)‐glycine]‐resistant soybean [ Glycine max (L.) Merr.] production in the Mid‐Atlantic occurs under full‐season and double‐crop production systems. Row‐spacing and seeding rate manipulation affects the yield of soybean. This study evaluated the effects upon yield caused by reductions in seeding rate from current standards for these two systems. During 2000–2002, row spacing (19 and 38 cm) and seeding rates (current standard, 20 and 40% less, and 20% greater than the standard) were tested using four glyphosate‐resistant cultivars representative of the maturity groups for the region. Tests were conducted for both full‐season and double‐crop systems at two Maryland locations for each per year on coastal plain soils. During the 3 yr, only 1 out of 48 total cultivar × row spacing comparisons for the two production systems had better yield with 38‐cm rows. At best, 38‐cm row spacing produced equivalent to the 19‐cm rows. A 20% seeding rate reduction (345800 seeds ha −1 for full‐season and 444600 seeds ha −1 for double‐crop production) was generally found to not yield significantly different than the standard seeding rates for both systems. A 40% reduction consistently had yield significantly less than the standards in both systems. These results indicate a 20% seeding rate reduction can be a cost‐saving practice for glyphosate‐resistant soybean production in the Mid‐Atlantic. With no yield loss at a 20% reduced seeding rate, additional profit ranging from $14.30 to $27.72 ha −1 can be realized.
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Claims 6
Claim · model-written summary
Only one of 48 comparisons favored 38-cm rows.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only 1 out of 48 total cultivar × row spacing comparisons for the two production systems had better yield with 38‐cm rows”
t0“Soybean”
Claim · model-written summary
At best 38-cm spacing yielded equivalently to 19-cm spacing.
- Taxon
- soybean
Glycine maxt0 - Treatment
- 38‐cm row spacinge0
- Outcome
- equivalente0
- Direction
- equivalente0
- Comparator
- 19‐cm rowse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At best, 38‐cm row spacing produced equivalent to the 19‐cm rows”
t0“Soybean”
Claim · model-written summary
A 20% seeding-rate reduction generally did not significantly change yield.
- Taxon
- soybeanGlycine maxt0
- Treatment
- 20% seeding rate reductione0
- Outcome
- yielde0
- Direction
- not yield significantly differente0
- Comparator
- standard seeding ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 20% seeding rate reduction (345800 seeds ha −1 for full‐season and 444600 seeds ha −1 for double‐crop production) was generally found to not yield significantly different than the standard seeding rates for both systems”
t0“Soybean”
Claim · model-written summary
A 40% seeding-rate reduction significantly reduced yield in both systems.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 40% reduction consistently had yield significantly less than the standards in both systems”
t0“Soybean”
Claim · model-written summary
A 20% seeding-rate reduction can save costs.
- Taxon
- soybeanGlycine maxe0
- Outcome
- 20% seeding rate reduction can be a cost‐saving practicee0
- Setting
- Mid‐Atlantice0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 20% seeding rate reduction can be a cost‐saving practice for glyphosate‐resistant soybean production in the Mid‐Atlantic”
Claim · model-written summary
A 20% seeding-rate reduction could add $14.30–$27.72 per hectare in profit.
- Taxon
- soybeanGlycine maxt0
- Outcome
- additional profite0
- Value
- $14.30 to $27.72 ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“additional profit ranging from $14.30 to $27.72 ha −1 can be realized”
t0“Soybean”
The same questions in other papers
density · yield · Glycine max (soybean)Positive and negative results
97 papers in the same direction as this paper · 207 reporting no difference from an alternative
- positive
- positive
- negative
301 papers more in this group
See all 305 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.