Abstract
When irrigation sources are limited, deficit irrigation at selected growth stages may help avoid crop stress at critical times. The objective of this study was to determine the effect of a single irrigation at different reproductive growth stages on yield and quality of early maturing (Maturity Group I) soybean [ Glycine max (L.) Merr.] cultivars. The experiment was conducted from 1991 through 1994 on a Parsons silt loam (fine, mixed, thermic Mollic Albaqualf). The experimental design was a randomized complete block with a split‐plot arrangement of treatments. Irrigation scheme (application of 2.5 or 5 cm at R4, R5, or R6) as the main plot was factorially arranged within each replicate, and cultivar (Hodgson 78 and Weber 84) was the subplot treatment. Also included was a randomized nonirrigated check whole plot planted with both cultivars. Yields from a single irrigation at R4, R5, or R6 were similar, and averaged approximately 20% more than yield with no irrigation (1.72 Mg ha −1 ). Irrigation at R4 increased seeds plant −1 , whereas R5 and R6 irrigations increased weight per seed. Irrigation had minimal effect on seed protein and variable effect on oil content. Visual quality of harvested seed frequently scored poor and irrigation improved quality only in 1992 when maximum air temperatures were <35°C. A single irrigation at R5 in 1991 improved germination to nearly 60% compared with 30% with no irrigation. Germination averaged 81% in other years with no irrigation effects. These data show that a single irrigation at different reproductive growth stages can influence early maturing soybean yield and quality, but the improvements may be inadequate to justify the practice.
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Claims 11
Claim · model-written summary
Irrigation at R4, R5 or R6 gave similar yield.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- single irrigation at R4, R5, or R6e0
- Outcome
- Yieldse0
- Direction
- similare0
- Comparator
- R4, R5, or R6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields from a single irrigation at R4, R5, or R6 were similar”
t0“A Single Irrigation to Improve Early Maturing Soybean Yield and Quality”
Claim · model-written summary
One irrigation averaged about 20% more yield than no irrigation.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- irrigatione0
- Outcome
- yielde0
- Direction
- moree0
- Value
- approximately 20%e0
- Qualifier
- 1.72 Mg ha −1e0
- Comparator
- no irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“averaged approximately 20% more than yield with no irrigation (1.72 Mg ha −1 )”
t0“A Single Irrigation to Improve Early Maturing Soybean Yield and Quality”
Claim · model-written summary
R4 irrigation increased seeds per plant.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Irrigation at R4e0
- Outcome
- seeds plant −1e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation at R4 increased seeds plant −1”
t0“A Single Irrigation to Improve Early Maturing Soybean Yield and Quality”
Claim · model-written summary
R5 irrigation increased weight per seed.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- R5e0
- Outcome
- weight per seede0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“R5 and R6 irrigations increased weight per seed”
t0“A Single Irrigation to Improve Early Maturing Soybean Yield and Quality”
Claim · model-written summary
R6 irrigation increased weight per seed.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- R6e0
- Outcome
- weight per seede0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“R5 and R6 irrigations increased weight per seed”
t0“A Single Irrigation to Improve Early Maturing Soybean Yield and Quality”
Claim · model-written summary
Irrigation had minimal effect on seed protein.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Irrigatione0
- Outcome
- seed proteine0
- Direction
- minimal effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation had minimal effect on seed protein”
t0“A Single Irrigation to Improve Early Maturing Soybean Yield and Quality”
Claim · model-written summary
Irrigation affected oil content variably.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Irrigatione0
- Outcome
- oil contente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation had minimal effect on seed protein and variable effect on oil content”
t0“A Single Irrigation to Improve Early Maturing Soybean Yield and Quality”
Claim · model-written summary
Irrigation improved seed visual quality only in 1992 below 35°C.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- irrigatione0
- Outcome
- qualitye0
- Direction
- improvede0
- Qualifier
- only in 1992 when maximum air temperatures were <35°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation improved quality only in 1992 when maximum air temperatures were <35°C”
t0“A Single Irrigation to Improve Early Maturing Soybean Yield and Quality”
Claim · model-written summary
One R5 irrigation in 1991 improved germination to nearly 60% versus 30% without irrigation.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- single irrigation at R5e0
- Outcome
- germinatione0
- Direction
- improvede0
- Value
- nearly 60%e0
- Qualifier
- 30%e0
- Comparator
- no irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single irrigation at R5 in 1991 improved germination to nearly 60% compared with 30% with no irrigation”
t0“A Single Irrigation to Improve Early Maturing Soybean Yield and Quality”
Claim · model-written summary
Other years had no irrigation effect on germination, which averaged 81%.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- irrigatione0
- Outcome
- Germinatione0
- Direction
- no irrigation effectse0
- Value
- 81%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Germination averaged 81% in other years with no irrigation effects”
t0“A Single Irrigation to Improve Early Maturing Soybean Yield and Quality”
Claim · model-written summary
Authors concluded that yield and quality gains may be inadequate to justify one irrigation.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- improvements may be inadequate to justify the practicee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the improvements may be inadequate to justify the practice”
t0“A Single Irrigation to Improve Early Maturing Soybean Yield and Quality”
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