Abstract
Drought stress consistently reduces soybean [ Glycine max (L.) Merr.] yield, while irrigation increases yields above nonirrigated levels in the southern USA in most years. Little information is available regarding drought stress and irrigation effects on quality of harvested soybean seed in this region, however. Field experiments using Maturity Group (MG) IV, V, and VI soybean cultivars were conducted in 1990 and 1991 at Stoneville, MS, to evaluate effects of drought and irrigation during reproductive development on subsequent germination of harvested seed. Treatments included a nonirrigated (NI) control and furrow irrigation (I) applied at various times during the reproductive period (R1–R6) in four different experiments. All experiments were grown on Sharkey clay (very‐fine, montmorillonitic, nonacid, thermic Vertic Haplaquept), a major soil in the alluvial plain of the lower Mississippi River Valley. Irrigation significantly increased seed yield and number of seed from all cultivars in all experiments. Effect of irrigation on weight per seed was none or small relative to effects on seed yield and number of seed. Drought stress resulted in significantly inferior quality (standard germination < 80%) seed from all cultivars in all experiments. Irrigation initiated during flowering and continued into the seed‐fill period significantly increased standard germination of seed from all experiments. Irrigation during the full reproductive period was required to realize both maximum seed yield and maximum germination of harvested seed. The results show that drought stress can result in reduced germination of harvested soybean seed, and that irrigation can be used to overcome this effect.
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Claims 5
Claim · model-written summary
Irrigation significantly increased seed yield and number of seed of soybean from all cultivars in all experiments, relative to the nonirrigated control.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- Irrigatione1
- Outcome
- seed yield and number of seede1
- Direction
- increasede1
- Comparator
- nonirrigated (NI) controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Treatments included a nonirrigated (NI) control”
e1“Irrigation significantly increased seed yield and number of seed from all cultivars in all experiments”
Claim · model-written summary
The effect of irrigation on weight per seed of soybean was none or small relative to its effects on seed yield and number of seed.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- irrigatione0
- Outcome
- weight per seede0
- Direction
- none or smalle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Effect of irrigation on weight per seed was none or small relative to effects on seed yield and number of seed”
Claim · model-written summary
Drought stress significantly reduced the quality of harvested soybean seed from all cultivars in all experiments, giving standard germination below 80%.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Drought stresse0
- Outcome
- standard germinatione0
- Direction
- inferiore0
- Value
- < 80%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Drought stress resulted in significantly inferior quality (standard germination < 80%) seed from all cultivars in all experiments”
Claim · model-written summary
Irrigation initiated during flowering and continued into the seed-fill period significantly increased standard germination of soybean seed in all experiments.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Irrigation initiated during flowering and continued into the seed‐fill periode0
- Outcome
- standard germinatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Irrigation initiated during flowering and continued into the seed‐fill period significantly increased standard germination of seed”
Claim · model-written summary
Irrigation during the full reproductive period was required to realize both maximum seed yield and maximum germination of harvested soybean seed.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- maximum seed yield and maximum germination of harvested seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Irrigation during the full reproductive period was required to realize both maximum seed yield and maximum germination of harvested seed”
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