Abstract
Summer crop plants grown in rain-fed fields suffer from drought during a hot and relatively dry summer after the rainy season called "Baiu" in Japan. Since crop plants might develop vigorous shoots with poorly developed root systems during the rainy season, they might suffer from water deficits in the summer, even when soil moisture depletes on the surface of the soil. In order to confirm this, the effects of pre-flowering soil moisture deficits on dry matter production and ecophysiological characteristics thereafter were investigated in soybean plants. Under deficient soil moisture conditions after flowering, higher dry matter production and higher grain yield were attained in the plants grown under deficient soil moisture before flowering (D-plot) than in the plants grown under sufficient soil moisture (W-plot). Large net assimilation rate (NAR) was responsible for high dry matter production in the plants of the D-plot. High NAR in the plants of the D-plot resulted from (1) a root system that was well developed in deep soil layers, (2) their capacity to absorb much soil water, especially in deep soil layers, (3) maintenance of a high leaf water potential and, therefore, a high photosynthetic rate during daytime and (4) a delay in the decrease in photosynthetic rate due to senescence. It was concluded that improved cultivation for developing root systems, such as drainage in the rainy season, as well as irrigation in midsummer, will be important in the cultivation of field summer crop plants in Japan.
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Claims 6
Claim · model-written summary
Soybean plants grown under pre-flowering soil moisture deficit produced higher dry matter than plants under sufficient soil moisture.
- Taxon
- soybean plants
Glycine maxe0 - Treatment
- deficient soil moisture before floweringe1
- Outcome
- dry matter productione1
- Direction
- highere1
- Comparator
- sufficient soil moisture (W-plot)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“were investigated in soybean plants”
e1“higher dry matter production and higher grain yield were attained in the plants grown under deficient soil moisture before flowering (D-plot) than in the plants grown under sufficient soil moisture (W-plot)”
Claim · model-written summary
Soybean plants grown under pre-flowering soil moisture deficit produced higher grain yield than plants under sufficient soil moisture.
- Taxon
- soybean plantsGlycine maxe0
- Treatment
- deficient soil moisture before floweringe1
- Outcome
- grain yielde1
- Direction
- highere1
- Comparator
- sufficient soil moisture (W-plot)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“were investigated in soybean plants”
e1“higher dry matter production and higher grain yield were attained in the plants grown under deficient soil moisture before flowering (D-plot) than in the plants grown under sufficient soil moisture (W-plot)”
Claim · model-written summary
High net assimilation rate (NAR) was responsible for the high dry matter production of plants under pre-flowering deficit.
- Taxon
- soybean plantsGlycine maxe0
- Outcome
- dry matter productione2
- Qualifier
- Large net assimilation rate (NAR)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“were investigated in soybean plants”
e2“Large net assimilation rate (NAR) was responsible for high dry matter production”
Claim · model-written summary
The root system of soybean plants under pre-flowering deficit was well developed in deep soil layers.
- Taxon
- soybean plantsGlycine maxe0
- Outcome
- root systeme3
- Qualifier
- well developed in deep soil layerse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“were investigated in soybean plants”
e3“a root system that was well developed in deep soil layers”
Claim · model-written summary
Plants under pre-flowering deficit maintained a high leaf water potential.
- Taxon
- soybean plantsGlycine maxe0
- Outcome
- maintenance of a high leaf water potentiale4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“were investigated in soybean plants”
e4“maintenance of a high leaf water potential”
Claim · model-written summary
Plants under pre-flowering deficit showed a delay in the decrease in photosynthetic rate due to senescence.
- Taxon
- soybean plantsGlycine maxe0
- Outcome
- a delay in the decrease in photosynthetic ratee5
- Qualifier
- due to senescencee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“were investigated in soybean plants”
e5“a delay in the decrease in photosynthetic rate due to senescence”
The same questions in other papers
soil water · yield · Glycine max (soybean)Results differ
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- no effect
- negative
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- negative
- negative
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See all 121 papers →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.