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 10
Claim · model-written summary
A single irrigation yielded about 20% more than no irrigation.
- Treatment
- a single irrigation at R4, R5, or R6e0
- Outcome
- Yieldse0
- Direction
- moree0
- Value
- approximately 20%e0
- Comparator
- no irrigatione0
Not reportedTaxon
Verbatim
e0“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).”
Claim · model-written summary
Irrigation at R4 increased seeds per plant.
Not reportedTaxonComparator
Verbatim
e0“Irrigation at R4 increased seeds plant−1”
Claim · model-written summary
R5 irrigation increased seed weight.
Not reportedTaxonComparator
Verbatim
e0“R5 and R6 irrigations increased weight per seed.”
Claim · model-written summary
R6 irrigation increased seed weight.
Not reportedTaxonComparator
Verbatim
e0“R5 and R6 irrigations increased weight per seed.”
Claim · model-written summary
Irrigation had minimal effect on seed protein.
Not reportedTaxonComparator
Verbatim
e0“Irrigation had minimal effect on seed protein and variable effect on oil content.”
Claim · model-written summary
Irrigation had variable effect on oil content.
Not reportedTaxonComparatorDirection
Verbatim
e0“Irrigation had minimal effect on seed protein and variable effect on oil content.”
Claim · model-written summary
Irrigation improved visual quality only in 1992 at cooler temperatures.
- Treatment
- irrigatione0
- Outcome
- qualitye0
- Direction
- improvede0
- Qualifier
- only in 1992 when maximum air temperatures were <35°Ce0
Not reportedTaxonComparator
Verbatim
e0“irrigation improved quality only in 1992 when maximum air temperatures were <35°C.”
Claim · model-written summary
R5 irrigation improved germination to nearly 60% versus 30%.
- Treatment
- A single irrigation at R5 in 1991e0
- Outcome
- germinatione0
- Direction
- improvede0
- Value
- nearly 60%e0
- Qualifier
- 30%e0
- Comparator
- no irrigatione0
Not reportedTaxon
Verbatim
e0“A single irrigation at R5 in 1991 improved germination to nearly 60% compared with 30% with no irrigation.”
Claim · model-written summary
Germination averaged 81% in other years with no irrigation effect.
Not reportedTaxon
Verbatim
e0“Germination averaged 81% in other years with no irrigation effects.”
Claim · model-written summary
Yield and quality gains may be inadequate to justify a single irrigation.
- Outcome
- improvements may be inadequate to justify the practicee0
Not reportedTaxon
Verbatim
e0“the improvements may be inadequate to justify the practice.”