Abstract
Abstract Achievement of maximum crop yields necessitates the study of factors influencing yields. The influence of irrigation regime and plant population on growth of a Group VII determinate soybean [ Glycine max (L.) Merr.] was measured to determine if a particular growth pattern would result in increased yield. In 1980 and 1981, ‘Braxton’ soybeans were grown in 0.91‐m rows on a Cecil sandy loam (clayey, kaolinitic, thermic Typic Hapludults) under full‐season irrigation (FSI), irrigation beginning at bloom (BI), and no irrigation (NI). Intrarow spacings ranged from 43 or 61 to 457 mm. At growth stage R2, FSI, BI, and NI plants had attained 72, 66, and 75%, respectively, of maximum height and 38, 35, and 55%, respectively, of maximum vegetative dry weight. Height, stem diameter, and dry weight were greater in the irrigated treatments than in NI. Fullseason irrigated plants were generally taller than BI and NI plants and had 1.7 times more dry weight at R2. With increasing spacing, height decreased while stem diameter increased. Vegetative weight was maximized at spacings of 76 mm or less. Development of canopy cover and LAI was more rapid with decreasing spacing and with irrigation. At least 90% canopy closure was obtained in all spacings of FSI and BI, whereas only 59% was achieved in NI. Yields were the same for FSI and BI, and, within irrigation treatments, there were no yield differences among spacings of 305 mm or less. We conclude that comparable yields can be obtained within a wide range of growth patterns, and that severe reductions in vegetative growth at R2 may have little influence on yield if water is supplied thereafter.
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Claims 11
Claim · model-written summary
At R2, fully irrigated soybean reached 72% maximum height and 38% maximum vegetative weight.
- Taxon
- soybean
Glycine maxt0 - Organ / stage
- R2e0
- Outcome
- maximum heighte0
- Value
- 72, 66, and 75%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At growth stage R2, FSI, BI, and NI plants had attained 72, 66, and 75%, respectively, of maximum height and 38, 35, and 55%, respectively, of maximum vegetative dry weight”
t0“Soybeans”
Claim · model-written summary
Irrigated soybean had greater height, stem diameter and dry weight than nonirrigated plants.
- Taxon
- soybeanGlycine maxt0
- Treatment
- irrigated treatmentse0
- Outcome
- Height, stem diameter, and dry weighte0
- Direction
- greatere0
- Comparator
- NIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Height, stem diameter, and dry weight were greater in the irrigated treatments than in NI”
t0“Soybeans”
Claim · model-written summary
Full-season irrigated soybean generally grew taller than BI and NI plants.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Fullseason irrigatede0
- Outcome
- tallere0
- Direction
- tallere0
- Comparator
- BI and NIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fullseason irrigated plants were generally taller than BI and NI plants”
t0“Soybeans”
Claim · model-written summary
Full-season irrigated soybean had 1.7 times more dry weight at R2.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“had 1.7 times more dry weight at R2”
t0“Soybeans”
Claim · model-written summary
Increasing spacing decreased soybean height.
- Taxon
- soybeanGlycine maxt0
- Treatment
- increasing spacinge0
- Outcome
- heighte0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing spacing, height decreased”
t0“Soybeans”
Claim · model-written summary
Increasing spacing increased soybean stem diameter.
- Taxon
- soybeanGlycine maxt0
- Treatment
- increasing spacinge0
- Outcome
- stem diametere0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing spacing, height decreased while stem diameter increased”
t0“Soybeans”
Claim · model-written summary
Vegetative weight was maximized at spacing of 76 mm or less.
- Taxon
- soybeanGlycine maxt0
- Treatment
- spacings of 76 mm or lesse0
- Outcome
- Vegetative weighte0
- Direction
- maximizede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vegetative weight was maximized at spacings of 76 mm or less”
t0“Soybeans”
Claim · model-written summary
Decreasing spacing and irrigation accelerated canopy cover and LAI development.
- Taxon
- soybeanGlycine maxt0
- Treatment
- decreasing spacing and with irrigatione0
- Outcome
- canopy cover and LAIe0
- Direction
- more rapide0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Development of canopy cover and LAI was more rapid with decreasing spacing and with irrigation”
t0“Soybeans”
Claim · model-written summary
FSI and BI achieved at least 90% canopy closure versus 59% with NI.
- Taxon
- soybeanGlycine maxt0
- Treatment
- FSI and BIe0
- Outcome
- canopy closuree0
- Value
- At least 90%e0
- Qualifier
- 59%e0
- Comparator
- NIe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At least 90% canopy closure was obtained in all spacings of FSI and BI, whereas only 59% was achieved in NI”
t0“Soybeans”
Claim · model-written summary
Yield was the same under FSI and BI.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields were the same for FSI and BI”
t0“Soybeans”
Claim · model-written summary
At spacing of 305 mm or less, soybean yield did not differ within irrigation treatments.
- Taxon
- soybeanGlycine maxt0
- Treatment
- spacings of 305 mm or lesse0
- Outcome
- yielde0
- Direction
- no yield differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“within irrigation treatments, there were no yield differences among spacings of 305 mm or less”
t0“Soybeans”
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