Abstract
In the Mississippi River alluvial plain, soybean [ Glycine max (L.) Merr.] is the primary crop. Seed yields of soybean grown under monocultured, dryland conditions in this region are usually lower than needed for profitable production. Experiments were conducted from 1985 through 1990 on Tunica clay (clayey over loamy, montmorillonitic, nonacid, thermic Vertic Hapla‐quept) near Stoneville, Mississippi, to determine the response of soybean to rotation with corn ( Zea mays L.) and sorghum [ Sorghum bicolor (L.) Moench] under irrigated (I) and nonirrigated (NI) conditions. The study included 2‐yr rotations of the following cropping systems in both I and NI experiments: (i) continuous corn (CC); (ii) continuous soybean (SBSB); (iii) continuous sorghum (SGSG); (iv) corn and soybean rotated (CSB); (v) sorghum and soybean rotated (SGSB); (vi) corn rotated with doublecropped wheat ( Triticum aestivum L.) and soybean (CWSB); and (vii) sorghum rotated with doublecropped wheat and soybean (SGWSB). Rotational cycles were such that soybean was grown in 1985, 1987, and 1989, and corn and sorghum in 1986, 1988, and 1990. In the I experiment, yield of soybean from CSB and SGSB was greater than yield from SBSB in only 1 of the 3 yr. Corn yield from CSB was greater than from CC in only 1 of the 3 yr, while sorghum yields were not different among rotations. In the NI experiment, the 3‐yr average soybean yield from CSB and SGSB (39.3 bu/acre) was greater than from SBSB (31.4 bu/acre). Corn yields were erratic, as was response to rotation. In 1990, yield of sorghum from SGSB was higher than from both SGSG and SGWSB. The inclusion of wheat in the rotations did not consistently affect response of corn and sorghum to rotation with soybean. These results indicate that rotation is not as important for maximizing soybean yield when irrigation is used on the clay soils of the lower Mississippi River alluvial plain.
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Claims 8
Claim · model-written summary
With irrigation, soybean rotated with corn or sorghum exceeded continuous soybean in only one of three years.
- Taxon
- soybean
Glycine maxe0 - Treatment
- CSB and SGSBe0
- Outcome
- yield of soybeane0
- Direction
- greatere0
- Qualifier
- only 1 of the 3 yre0
- Comparator
- SBSBe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the I experiment, yield of soybean from CSB and SGSB was greater than yield from SBSB in only 1 of the 3 yr”
Claim · model-written summary
With irrigation, corn following soybean exceeded continuous corn in only one of three years.
- Taxon
- Corn
Zea mays subsp. mayse0 - Treatment
- CSBe0
- Outcome
- Corn yielde0
- Direction
- greatere0
- Qualifier
- only 1 of the 3 yre0
- Comparator
- CCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn yield from CSB was greater than from CC in only 1 of the 3 yr”
Claim · model-written summary
Irrigated sorghum yields did not differ across rotations.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sorghum yields were not different among rotations”
Claim · model-written summary
Without irrigation, rotated soybean averaged 39.3 bu/acre versus 31.4 for continuous soybean.
- Taxon
- soybeanGlycine maxe0
- Treatment
- CSB and SGSBe0
- Outcome
- soybean yielde0
- Direction
- greatere0
- Value
- 39.3 bu/acree0
- Qualifier
- 31.4 bu/acree0
- Comparator
- SBSBe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the NI experiment, the 3‐yr average soybean yield from CSB and SGSB (39.3 bu/acre) was greater than from SBSB (31.4 bu/acre)”
Claim · model-written summary
Corn yield and rotation response were erratic without irrigation.
- Taxon
- CornZea mays subsp. mayse0
- Outcome
- Corn yieldse0
- Qualifier
- erratice0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn yields were erratic, as was response to rotation”
Claim · model-written summary
In 1990, sorghum following soybean yielded more than continuous sorghum or sorghum with wheat and soybean.
- Treatment
- SGSBe0
- Outcome
- yield of sorghume0
- Direction
- highere0
- Qualifier
- In 1990e0
- Comparator
- SGSG and SGWSBe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1990, yield of sorghum from SGSB was higher than from both SGSG and SGWSB”
Claim · model-written summary
Including wheat did not consistently affect corn and sorghum rotation responses.
- Taxon
- corn and sorghum
SorghumZea mays subsp. mayse0 - Treatment
- inclusion of wheat in the rotationse0
- Outcome
- response of corn and sorghum to rotation with soybeane0
- Direction
- did not consistently affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inclusion of wheat in the rotations did not consistently affect response of corn and sorghum to rotation with soybean”
Claim · model-written summary
Rotation was judged less important for maximizing soybean yield under irrigation on clay soils.
- Taxon
- soybeanGlycine maxe0
- Outcome
- maximizing soybean yielde0
- Qualifier
- when irrigation is used on the clay soils of the lower Mississippi River alluvial plaine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rotation is not as important for maximizing soybean yield when irrigation is used on the clay soils of the lower Mississippi River alluvial plain”
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See all 14 papers →8 of 11 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.