Abstract
The effects of two constant water table treatments, maintained at 3 and 15 cm below the soil surface (CWT 3 and CWT 15, respectively), were compared with the effect of overhead irrigation (OHI) on dry matter production of nine soybean (Glycine max) lines, grown for 36 days in beds of soil in the glasshouse. The lines represented a range of maturity groups. Water for each irrigation treatment was supplied with, or without, dissolved inorganic nitrogen (100 ppm N), on a split plot basis. CWT 15 plants accumulated 37% more dry matter, and 35 times more nodule dry matter, than did OH1 plants. CWT 3 plants became very chlorotic within a week of imposing the water table, but recovered to produce only 18% less dry matter than the OHI plants. CWT 3 plants accumulated the greatest amount of nodule dry matter, and this fraction accounted for 5% of total plant dry weight in some lines. Plants in both of the water table regimes were taller than the OHI plants, even for lines that flowered in 21 days, and this effect reduced the cultural disadvantage of short stature normally noted in early flowering lines. Nitrogen application marginally increased shoot proportion, plant height and node number, but decreased nodule mass in CWT 15 and OHI plants. The study indicated that soybeans can respond well to permanent water tables maintained close to the soil surface, and attain rapid early growth independent of applied nitrogen. Projections suggest that high yields of seed are feasible in 80-85 day soybean crops growing on a controlled water table system. This system also may promote other operational efficiencies related to a shortened cropping cycle, simplified water management, and weed control.
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Claims 12
Claim · model-written summary
CWT 15 plants accumulated 37% more dry matter than OHI plants.
- Taxon
- soybean
Glycine maxt0 - Treatment
- CWT 15e0
- Outcome
- dry mattere0
- Direction
- moree0
- Value
- 37%e0
- Comparator
- OHIe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CWT 15 plants accumulated 37% more dry matter, and 35 times more nodule dry matter, than did OH1 plants”
e1“recovered to produce only 18% less dry matter than the OHI plants”
t0“Response of nine soybean lines to soil moisture conditions close to saturation”
Claim · model-written summary
CWT 15 plants accumulated 35 times more nodule dry matter than OHI plants.
- Taxon
- soybeanGlycine maxt0
- Treatment
- CWT 15e0
- Outcome
- nodule dry mattere0
- Direction
- moree0
- Value
- 35 timese0
- Comparator
- OHIe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CWT 15 plants accumulated 37% more dry matter, and 35 times more nodule dry matter, than did OH1 plants”
e1“recovered to produce only 18% less dry matter than the OHI plants”
t0“Response of nine soybean lines to soil moisture conditions close to saturation”
Claim · model-written summary
CWT 3 plants became chlorotic within a week.
- Taxon
- soybeanGlycine maxt0
- Treatment
- CWT 3e0
- Outcome
- very chlorotice0
- Qualifier
- within a weeke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CWT 3 plants became very chlorotic within a week of imposing the water table”
t0“Response of nine soybean lines to soil moisture conditions close to saturation”
Claim · model-written summary
CWT 3 plants recovered and produced 18% less dry matter than OHI plants.
- Taxon
- soybeanGlycine maxt0
- Treatment
- CWT 3e1
- Outcome
- dry mattere0
- Direction
- lesse0
- Value
- 18%e0
- Comparator
- OHIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“recovered to produce only 18% less dry matter than the OHI plants”
e1“CWT 3 plants became very chlorotic within a week of imposing the water table”
t0“Response of nine soybean lines to soil moisture conditions close to saturation”
Claim · model-written summary
CWT 3 plants had the greatest nodule dry matter.
- Taxon
- soybeanGlycine maxt0
- Treatment
- CWT 3e0
- Outcome
- nodule dry mattere0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CWT 3 plants accumulated the greatest amount of nodule dry matter”
t0“Response of nine soybean lines to soil moisture conditions close to saturation”
Claim · model-written summary
Nodule dry matter represented 5% of total plant dry weight in some lines.
- Taxon
- soybeanGlycine maxt0
- Outcome
- total plant dry weighte0
- Value
- 5%e0
- Qualifier
- some linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this fraction accounted for 5% of total plant dry weight in some lines”
t0“Response of nine soybean lines to soil moisture conditions close to saturation”
Claim · model-written summary
Both water table regimes produced taller plants than OHI.
- Taxon
- soybeanGlycine maxt0
- Treatment
- both of the water table regimese0
- Outcome
- tallere0
- Direction
- tallere0
- Comparator
- OHIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants in both of the water table regimes were taller than the OHI plants”
t0“Response of nine soybean lines to soil moisture conditions close to saturation”
Claim · model-written summary
Nitrogen marginally increased shoot proportion, plant height, and node number.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Nitrogen applicatione0
- Outcome
- shoot proportion, plant height and node numbere0
- Direction
- increasede0
- Qualifier
- marginallye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen application marginally increased shoot proportion, plant height and node number”
t0“Response of nine soybean lines to soil moisture conditions close to saturation”
Claim · model-written summary
Nitrogen decreased nodule mass in CWT 15 and OHI plants.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Nitrogen applicatione1
- Outcome
- nodule masse0
- Direction
- decreasede0
- Qualifier
- CWT 15 and OHI plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased nodule mass in CWT 15 and OHI plants”
e1“Nitrogen application marginally increased shoot proportion, plant height and node number”
t0“Response of nine soybean lines to soil moisture conditions close to saturation”
Claim · model-written summary
Soybeans attained rapid early growth independently of applied nitrogen under near-surface water tables.
- Taxon
- soybeansGlycine maxe0
- Treatment
- permanent water tables maintained close to the soil surfacee0
- Outcome
- rapid early growthe0
- Qualifier
- independent of applied nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybeans can respond well to permanent water tables maintained close to the soil surface, and attain rapid early growth independent of applied nitrogen”
Claim · model-written summary
High seed yield was projected feasible for short-cycle soybean on controlled water tables.
- Taxon
- soybeanGlycine maxe0
- Treatment
- controlled water table systeme0
- Outcome
- high yields of seede0
- Qualifier
- 80-85 day soybean cropse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Projections suggest that high yields of seed are feasible in 80-85 day soybean crops growing on a controlled water table system”
Claim · model-written summary
The controlled water table system may shorten cropping cycles and simplify water management and weed control.
- Taxon
- soybeanGlycine maxt0
- Outcome
- shortened cropping cycle, simplified water management, and weed controle0
- Qualifier
- maye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This system also may promote other operational efficiencies related to a shortened cropping cycle, simplified water management, and weed control”
t0“Response of nine soybean lines to soil moisture conditions close to saturation”
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See all 153 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.