Abstract
Field studies were on a commerce silt loam soil in a paddy field using three soybean (Glycine max L.) cultivars Pungsan-namulkong, Sobaeg-namulkong and Saebyeolkong of determinate growth type, which have different productivity. The flood duration was done for 3, 5, 7 and 9 days, respectively when plants were at the vegetative (V5 to V6) stages filled with tap water to 2 cm above the level of the soil surface by irrigation. After removal of flooding, photosynthetic rate reduced in all flooding treatments except for 3 days’ flooding. Reduction of photosynthetic rate was relatively lower in Saebyeolkong than any others. The number of pod and seed decreased as much as the flood period was prolonged. There was a significantly positive relationship (R^2＝0.50, p＜0.01) between the ratio of seed yield on branch stem against that on main stem and the seed yield of three soybean cultivars treated with flooding. Also, the relationship between the seed yield and the relative yield of the flooded soybean to non-flooded one had a high positive significance, and there was more significant difference in relative yield of branch stem (R^2＝0.91, p＜0.01) than that of main stem (R^2＝0.88, p＜0.01). From these results, it was ascertained that the high yield soybean cultivar (Saebyeolkong) under the upland field condition (Cho et al., 2005) has the highest ability of productivity under the paddy field condition in the rainy season. From above results, the accumulation of biomass was considerably reduced by longer exposure of soybeans against flooding. Flooding stress was also decreased in the photosynthesis and the seed yield of soybeans. The seed yield was remarkably reduced from flood duration of 3 days. That is, a critical day for drainage after flooding might be 3 days.
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Claims 9
Claim · model-written summary
Flooding longer than three days reduced photosynthetic rate.
- Taxon
- soybean
Glycine maxt0 - Treatment
- flooding treatmentse0
- Outcome
- photosynthetic ratee0
- Direction
- reducede0
- Comparator
- 3 days’ floodinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosynthetic rate reduced in all flooding treatments except for 3 days’ flooding”
t0“Soybean”
Claim · model-written summary
Saebyeolkong had less reduction in photosynthetic rate than other cultivars.
- Taxon
- soybeanGlycine maxt0
- Material
- Saebyeolkonge0
- Outcome
- Reduction of photosynthetic ratee0
- Direction
- lowere0
- Comparator
- any otherse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction of photosynthetic rate was relatively lower in Saebyeolkong than any others”
t0“Soybean”
Claim · model-written summary
Pod number declined as flooding duration lengthened.
- Taxon
- soybeanGlycine maxt0
- Treatment
- flood periode0
- Outcome
- number of pode0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of pod and seed decreased as much as the flood period was prolonged”
t0“Soybean”
Claim · model-written summary
Seed number declined as flooding duration lengthened.
- Taxon
- soybeanGlycine maxt0
- Treatment
- flood periode0
- Outcome
- seede0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of pod and seed decreased as much as the flood period was prolonged”
t0“Soybean”
Claim · model-written summary
Branch-to-main-stem seed yield ratio was positively associated with total seed yield.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- branch steme0
- Outcome
- seed yield of three soybean cultivarse0
- Direction
- positivee0
- Value
- R^2＝0.50e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significantly positive relationship (R^2＝0.50, p＜0.01) between the ratio of seed yield on branch stem against that on main stem and the seed yield of three soybean cultivars treated with flooding”
t0“Soybean”
Claim · model-written summary
Branch-stem relative yield was more strongly associated with seed yield than main-stem relative yield.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- branch steme0
- Outcome
- relative yield of branch steme0
- Direction
- more significante0
- Value
- R^2＝0.91e0
- Comparator
- main steme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“more significant difference in relative yield of branch stem (R^2＝0.91, p＜0.01) than that of main stem (R^2＝0.88, p＜0.01)”
t0“Soybean”
Claim · model-written summary
Longer flooding substantially reduced soybean biomass accumulation.
- Taxon
- soybeansGlycine maxe0
- Treatment
- longer exposure of soybeans against floodinge0
- Outcome
- accumulation of biomasse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accumulation of biomass was considerably reduced by longer exposure of soybeans against flooding”
Claim · model-written summary
Soybean seed yield was markedly reduced from three days of flooding.
- Taxon
- soybeanGlycine maxt0
- Treatment
- flood duration of 3 dayse0
- Outcome
- seed yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed yield was remarkably reduced from flood duration of 3 days”
t0“Soybean”
Claim · model-written summary
Authors suggest drainage within three days after flooding.
- Taxon
- soybeanGlycine maxt0
- Outcome
- drainage after floodinge0
- Value
- 3 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a critical day for drainage after flooding might be 3 days”
t0“Soybean”
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See all 13 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.