Abstract
Abstract In the southeastern United States between 25 and 40% of the soybean [ Glycine max (L.) Merr.] hectarage is double‐cropped. Information on desirable production practices for double cropping soybeans after small grains, soybeans, or corn ( Zea mays L.) is limited. The objectives of this study were to evaluate the effects of late (late June or early July) and ultra‐late (late July or early August) planting dates, 51‐ and 91‐cm row widths, irrigated and nonirrigated treatments, and Maturity Group VII determinate (‘Bragg’) and indeterminate (Ga76‐32 and Ga76‐18) genotypes on seed yield and other plant traits. The experiment was conducted at Plains, Ga. (32°N Lat 84°W Long) on a Greenville sandy loam (Rhodic Paleudult, clayey, kaolinitic, thermic family) soil in one dry (1978) and two intermediate rainfall seasons (1979 and 1980). Delays in planting from early July to late July resulted in an average yield reduction of 36 kg ha −1 day −1 (1.5%). In the dry season supplemental irrigation increased yield 355% (2,623 kg ha −1 ) in the late planting and 115% (635 kg ha −1 ) in the ultra‐late planting. In the intermediate rainfall seasons irrigation increased yields 38% (784 kg ha −1 ) for the late and 15% (190 kg ha −1 ) for the ultra‐late planting. The 51‐cm rows averaged 17% (278 kg ha −1 ) higher seed yield than the 91‐cm rows when averaged over years and all other factors. Genotypes did not differ in seed yield. The magnitude of the yield reduction from delays in planting and the high response to irrigation in dry seasons indicate the importance of intensive management to obtain maximum yields in these late‐planted environments.
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Claims 8
Claim · model-written summary
Delaying soybean planting from early to late July reduced yield by 36 kg ha −1 day −1 (1.5%).
- Taxon
- soybean
Glycine maxe1 - Treatment
- late Julye0
- Outcome
- yielde0
- Direction
- reductione0
- Value
- 36 kg ha −1 day −1 (1.5%)e0
- Comparator
- early Julye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delays in planting from early July to late July resulted in an average yield reduction of 36 kg ha −1 day −1 (1.5%)”
e1“soybean [ Glycine max (L.) Merr.]”
Claim · model-written summary
In the dry season, irrigation raised late planting yield 355% (2,623 kg ha −1).
- Taxon
- soybeanGlycine maxe1
- Treatment
- supplemental irrigatione0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 355% (2,623 kg ha −1 )e0
- Qualifier
- dry seasone0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the dry season supplemental irrigation increased yield 355% (2,623 kg ha −1 ) in the late planting”
e1“soybean [ Glycine max (L.) Merr.]”
Claim · model-written summary
In the dry season, irrigation raised ultra-late planting yield 115% (635 kg ha −1).
- Taxon
- soybeanGlycine maxe1
- Treatment
- supplemental irrigatione0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 115% (635 kg ha −1 )e0
- Qualifier
- ultra‐late plantinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the dry season supplemental irrigation increased yield 355% (2,623 kg ha −1 ) in the late planting and 115% (635 kg ha −1 ) in the ultra‐late planting”
e1“soybean [ Glycine max (L.) Merr.]”
Claim · model-written summary
In intermediate rainfall seasons, irrigation raised late planting yields 38% (784 kg ha −1).
- Taxon
- soybeanGlycine maxe1
- Treatment
- irrigatione0
- Outcome
- yieldse0
- Direction
- increasede0
- Value
- 38% (784 kg ha −1 )e0
- Qualifier
- intermediate rainfall seasonse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the intermediate rainfall seasons irrigation increased yields 38% (784 kg ha −1 ) for the late”
e1“soybean [ Glycine max (L.) Merr.]”
Claim · model-written summary
In intermediate rainfall seasons, irrigation raised ultra-late planting yields 15% (190 kg ha −1).
- Taxon
- soybeanGlycine maxe1
- Treatment
- irrigatione0
- Outcome
- yieldse0
- Direction
- increasede0
- Value
- 15% (190 kg ha −1 )e0
- Qualifier
- ultra‐late plantinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the intermediate rainfall seasons irrigation increased yields 38% (784 kg ha −1 ) for the late and 15% (190 kg ha −1 ) for the ultra‐late planting”
e1“soybean [ Glycine max (L.) Merr.]”
Claim · model-written summary
Rows 51 cm wide averaged 17% (278 kg ha −1) higher soybean seed yield than 91 cm rows.
- Taxon
- soybeanGlycine maxe1
- Treatment
- 51‐cm rowse0
- Outcome
- seed yielde0
- Direction
- highere0
- Value
- 17% (278 kg ha −1 )e0
- Comparator
- 91‐cm rowse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The 51‐cm rows averaged 17% (278 kg ha −1 ) higher seed yield than the 91‐cm rows”
e1“soybean [ Glycine max (L.) Merr.]”
Claim · model-written summary
The soybean genotypes did not differ in seed yield.
- Taxon
- soybeanGlycine maxe1
- Material
- Genotypese0
- Outcome
- seed yielde0
- Direction
- did not differe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes did not differ in seed yield”
e1“soybean [ Glycine max (L.) Merr.]”
Claim · model-written summary
The authors recommend intensive management to obtain maximum yields in late-planted soybean environments.
- Taxon
- soybeanGlycine maxe1
- Outcome
- intensive management to obtain maximum yieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the importance of intensive management to obtain maximum yields in these late‐planted environments”
e1“soybean [ Glycine max (L.) Merr.]”
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.