Abstract
Abstract Because of adverse weather and management decisions, soybean [ Glycine max (L.) Merr.] is often planted beyond the period considered optimum. In the southern Mississippi River alluvial plain, this frequently occurs on clay soil. Research was conducted from 1984 through 1986 at Stoneville, MS, on Sharkey clay (very‐fine, montmorillonitic, nonacid, thermic Vertic Haplaquept) to determine the effect of irrigation and row spacing on seed yield and yield components of early or mid‐May versus late‐June plantings of soybean. ‘Braxton’ was planted in 0.53‐ and 1.02‐m‐wide rows and was either nonirrigated or irrigated from the R1 to R6 stages. Irrigation significantly increased yield regardless of row spacing or planting date, but the increase was always greater for early plantings. Seed yields from the irrigated early plantings in 1984,1985, and 1986 averaged 3570, 2960, and 2695 kg ha −1 , while the later plantings averaged 3115,1900, and 1425 kg ha −1 , respectively. Without irrigation, yield differences between planting dates were not significant. Average nonirrigated yields were 1495,1760, and 185 kg ha −1 for 1984,1985, and 1986, respectively. Narrow rows produced 100 kg ha −1 more seed when averaged over all environments, and row spacing did not significantly alter the planting date × irrigation treatment interaction. Yield increases from irrigation were primarily attributable to increased number of seed. These results show that (i) late planting of soybean on clay soil in either row spacing used will result in significant yield decline even with irrigation, (ii) nonirrigated production of soybean on clay soil is risky, and (iii) choice of row spacing is not as important a consideration as is the alleviation of drought stress on this soil type regardless of planting date.
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Claims 11
Claim · model-written summary
Irrigation significantly increased soybean yield, with larger gains in early plantings.
- Taxon
- soybean
Glycine maxe0 - Treatment
- Irrigatione1
- Outcome
- yielde1
- Direction
- increasede1
- Qualifier
- greater for early plantingse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean [ Glycine max (L.) Merr.]”
e1“Irrigation significantly increased yield regardless of row spacing or planting date, but the increase was always greater for early plantings.”
Claim · model-written summary
Irrigated early planting yielded 3570 in 1984.
- Taxon
- soybeanGlycine maxe0
- Treatment
- irrigated early plantingse1
- Outcome
- Seed yieldse1
- Value
- 3570e1
- Qualifier
- 1984e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean [ Glycine max (L.) Merr.]”
e1“Seed yields from the irrigated early plantings in 1984,1985, and 1986 averaged 3570, 2960, and 2695 kg ha −1”
Claim · model-written summary
Irrigated early planting yielded 2960 in 1985.
- Taxon
- soybeanGlycine maxe0
- Treatment
- irrigated early plantingse1
- Outcome
- Seed yieldse1
- Value
- 2960e1
- Qualifier
- 1985e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean [ Glycine max (L.) Merr.]”
e1“Seed yields from the irrigated early plantings in 1984,1985, and 1986 averaged 3570, 2960, and 2695 kg ha −1”
Claim · model-written summary
Irrigated early planting yielded 2695 kg ha −1 in 1986.
- Taxon
- soybeanGlycine maxe0
- Treatment
- irrigated early plantingse1
- Outcome
- Seed yieldse1
- Value
- 2695 kg ha −1e1
- Qualifier
- 1986e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean [ Glycine max (L.) Merr.]”
e1“Seed yields from the irrigated early plantings in 1984,1985, and 1986 averaged 3570, 2960, and 2695 kg ha −1”
Claim · model-written summary
Without irrigation, planting date did not significantly alter yield.
- Taxon
- soybeanGlycine maxe0
- Outcome
- yield differencese1
- Qualifier
- Without irrigatione1
- Comparator
- planting datese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean [ Glycine max (L.) Merr.]”
e1“Without irrigation, yield differences between planting dates were not significant.”
Claim · model-written summary
Narrow rows yielded 100 kg ha −1 more seed across environments.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean [ Glycine max (L.) Merr.]”
e1“Narrow rows produced 100 kg ha −1 more seed when averaged over all environments”
Claim · model-written summary
Row spacing did not significantly alter the planting date by irrigation interaction.
- Taxon
- soybeanGlycine maxe0
- Treatment
- row spacinge1
- Outcome
- planting date × irrigation treatment interactione1
- Direction
- did not significantly altere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean [ Glycine max (L.) Merr.]”
e1“row spacing did not significantly alter the planting date × irrigation treatment interaction”
Claim · model-written summary
Irrigation yield increases were primarily attributable to seed number.
- Taxon
- soybeanGlycine maxe0
- Treatment
- irrigatione1
- Outcome
- Yield increasese1
- Qualifier
- increased number of seede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean [ Glycine max (L.) Merr.]”
e1“Yield increases from irrigation were primarily attributable to increased number of seed.”
Claim · model-written summary
The authors conclude late planting on clay soil reduces yield even with irrigation.
- Taxon
- soybeanGlycine maxe0
- Treatment
- late plantinge1
- Outcome
- significant yield declinee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean [ Glycine max (L.) Merr.]”
e1“late planting of soybean on clay soil in either row spacing used will result in significant yield decline even with irrigation”
Claim · model-written summary
The authors consider nonirrigated soybean production on clay soil risky.
- Taxon
- soybeanGlycine maxe0
- Outcome
- nonirrigated production of soybean on clay soil is riskye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean [ Glycine max (L.) Merr.]”
e1“nonirrigated production of soybean on clay soil is risky”
Claim · model-written summary
The authors prioritize drought stress alleviation over row spacing choice.
- Taxon
- soybeanGlycine maxe0
- Outcome
- alleviation of drought stresse1
- Comparator
- choice of row spacinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean [ Glycine max (L.) Merr.]”
e1“choice of row spacing is not as important a consideration as is the alleviation of drought stress on this soil type regardless of planting date”
The same questions in other papers
irrigation · yield · Glycine max (soybean)Positive and negative results
263 papers in the same direction as this paper · 72 in the opposite direction · 7 reporting no difference from an alternative
- positive
- positive
- positive
339 papers more in this group
See all 343 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.