Abstract
Traditionally grown soybean [ Glycine max (L.) Merr.] Maturity Groups V and VI are subject to late‐season drought in the US Mid‐South, resulting in yield reductions when planted in mid‐May. Earlier maturing soybean, such as the more recently adapted Maturity Group III cultivars, have generated interest among farmers as a way to avoid the effects of late‐season drought. We investigated economically optimal plant population density for soybean considering seeding rate, row spacing, seed and soybean prices, and weather for Maturity Groups V, IV, and III grown on the rainfed soils in the rolling uplands region of the US Mid‐South. Three separate experiments were conducted for Maturity Groups V, IV, and III in 2005 through 2007. Soybean was planted in mid‐May in narrow (38‐cm) and wide (76‐cm) rows at seeding rates of 60 to 593 (× 10 3 ) seeds ha −1 . Three key implications resulted from this study. First, yield did not respond to plant population density, and an extended yield plateau was found in each maturity group experiment, implying an economic incentive to reduce seed costs to achieve the plant population density at the minimum point on the yield plateau. Second, yield and net‐return responses to row spacing were inconsistent and primarily influenced by weather, but if Maturity Group III soybean were planted, narrow row spacing may provide higher expected yields and net returns. Third, planting Maturity Group III soybean may not overcome the susceptibility of Maturity Groups V and IV soybean to the late‐season drought conditions in the rolling uplands region of the Mid‐South.
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Claims 8
Claim · model-written summary
Yield did not respond to population density across maturity groups.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- plant population densitye0
- Outcome
- yielde0
- Direction
- did not responde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“yield did not respond to plant population density, and an extended yield plateau was found in each maturity group experiment”
Claim · model-written summary
Each maturity group had an extended yield plateau.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- extended yield plateaue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“yield did not respond to plant population density, and an extended yield plateau was found in each maturity group experiment”
Claim · model-written summary
The authors infer an incentive to reduce seed costs toward the minimum population on the yield plateau.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- reduce seed costs to achieve the plant population density at the minimum point on the yield plateaue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“implying an economic incentive to reduce seed costs to achieve the plant population density at the minimum point on the yield plateau”
Claim · model-written summary
Yield responses to row spacing varied and were primarily influenced by weather.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- row spacinge0
- Outcome
- yielde0
- Direction
- inconsistente0
Not reportedCompound
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“yield and net‐return responses to row spacing were inconsistent and primarily influenced by weather”
Claim · model-written summary
Net return responses to row spacing varied and were primarily influenced by weather.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- row spacinge0
- Outcome
- net‐returne0
- Direction
- inconsistente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“yield and net‐return responses to row spacing were inconsistent and primarily influenced by weather”
Claim · model-written summary
Narrow rows may raise expected yields for Maturity Group III soybean.
- Taxon
- SoybeanGlycine maxt0
- Material
- Maturity Group IIIe0
- Treatment
- narrow row spacinge0
- Outcome
- yieldse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“if Maturity Group III soybean were planted, narrow row spacing may provide higher expected yields and net returns”
Claim · model-written summary
Narrow rows may raise expected net returns for Maturity Group III soybean.
- Taxon
- SoybeanGlycine maxt0
- Material
- Maturity Group IIIe0
- Treatment
- narrow row spacinge0
- Outcome
- net returnse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“if Maturity Group III soybean were planted, narrow row spacing may provide higher expected yields and net returns”
Claim · model-written summary
Maturity Group III planting may not overcome late season drought susceptibility relative to Groups V and IV.
- Taxon
- SoybeanGlycine maxt0
- Material
- Maturity Group IIIe0
- Outcome
- may not overcome the susceptibility of Maturity Groups V and IV soybean to the late‐season drought conditionse0
- Setting
- rolling uplands region of the Mid‐Southe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“planting Maturity Group III soybean may not overcome the susceptibility of Maturity Groups V and IV soybean to the late‐season drought conditions in the rolling uplands region of the Mid‐South”
The same questions in other papers
density · yield · Glycine max (soybean)Positive and negative results
206 papers in the same direction as this paper · 94 in the opposite direction · 4 reporting no difference from an alternative
- negative
- no effect
- 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.