Abstract
The objective of this study was to obtain physiological information for the increasing yield of soybeans at drained paddy fields by controlling the water table level. We studied the effects of various water table levels using lysimeter (15cm∼100cm constant, fluctuation, no-irrigation) on leaf chlorophyll content, root growth and yield of soybeans grown on alluvial soil, which is a major soil type in the soybean producing area in Japan. Experiments were carried out in 1991 (wet year) and 1992 (dry year) at Tsukuba (1991, 1992) and Fukuyama (1992). Effects of water table on chlorophyll contents varied with leaf position on the main stem. The lower leaves contained more chlorophyll when the plants were grown at lower water table. The upper leaves responded in the same way as lower leaves in wet year, whereas the chlorophyll content was highest at a 40cm depth in dry year. The root length densities in each soil layer were also affected by water table : two peaks of root length density (upper layer and just above the water table) were observed in the 7Ocm-depth treatment, whereas the peak was observed only at the uppermost layer in the 20cm or 40cm depth treated plots. The effects of water table on yield seem to be affected by the amount of rainfall. The highest yield was brought in by 70cm-depth water table treatment in wet year, and by 40cm in dry year. Fluctuation of water table reduced yield. The results indicate that for getting a higher yield of soybeans at drained paddy field, it is important to maintain water table at a suitable level, which should be adjusted according to rainfall.
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Claims 10
Claim · model-written summary
Lower soybean leaves contained more chlorophyll at lower water tables.
- Taxon
- soybean
Glycine maxt0 - Organ / stage
- lower leavese0
- Treatment
- lower water tablee0
- Outcome
- chlorophylle0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lower leaves contained more chlorophyll when the plants were grown at lower water table.”
t0“soybean”
Claim · model-written summary
Upper leaves also had more chlorophyll at lower water tables in the wet year.
- Taxon
- soybeanGlycine maxt0
- Treatment
- wet yeare0
- Outcome
- upper leavese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The upper leaves responded in the same way as lower leaves in wet year”
t0“soybean”
Claim · model-written summary
Upper-leaf chlorophyll was highest at a 40cm water-table depth in the dry year.
- Taxon
- soybeanGlycine maxt0
- Treatment
- 40cm depthe0
- Outcome
- chlorophyll contente0
- Direction
- higheste0
- Qualifier
- dry yeare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the chlorophyll content was highest at a 40cm depth in dry year.”
t0“soybean”
Claim · model-written summary
At 70cm depth, root-length density showed two peaks.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- upper layer and just above the water tablee0
- Treatment
- 7Ocm-depth treatmente0
- Outcome
- two peaks of root length densitye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two peaks of root length density (upper layer and just above the water table) were observed in the 7Ocm-depth treatment”
t0“soybean”
Claim · model-written summary
At 20cm depth, root-length density peaked only in the uppermost layer.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- uppermost layere0
- Treatment
- 20cme0
- Outcome
- peake0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the peak was observed only at the uppermost layer in the 20cm or 40cm depth treated plots”
t0“soybean”
Claim · model-written summary
At 40cm depth, root-length density peaked only in the uppermost layer.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- uppermost layere0
- Treatment
- 40cme0
- Outcome
- peake0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the peak was observed only at the uppermost layer in the 20cm or 40cm depth treated plots”
t0“soybean”
Claim · model-written summary
In the wet year, yield was highest at 70cm water-table depth.
- Taxon
- soybeanGlycine maxt0
- Treatment
- 70cm-depth water table treatmente0
- Outcome
- yielde0
- Direction
- higheste0
- Qualifier
- wet yeare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest yield was brought in by 70cm-depth water table treatment in wet year”
t0“soybean”
Claim · model-written summary
In the dry year, yield was highest at 40cm water-table depth.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest yield was brought in by 70cm-depth water table treatment in wet year, and by 40cm in dry year”
t0“soybean”
Claim · model-written summary
Fluctuating the water table reduced soybean yield.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Fluctuation of water tablee0
- Outcome
- yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fluctuation of water table reduced yield.”
t0“soybean”
Claim · model-written summary
The authors advise adjusting water-table level according to rainfall to increase soybean yield in drained paddy fields.
- Taxon
- soybeansGlycine maxe0
- Outcome
- maintain water table at a suitable levele0
- Qualifier
- according to rainfalle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for getting a higher yield of soybeans at drained paddy field, it is important to maintain water table at a suitable level, which should be adjusted according to rainfall.”
The same questions in other papers
soil water · yield · Glycine max (soybean)Results differ
14 papers in the same direction as this paper · 23 in the opposite direction
- no effect
- negative
- no effect
34 papers more in this group
See all 38 papers →soil water · physiology: pigments · Glycine max (soybean)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
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.