Abstract
The controlled water table irrigation system (CWT) consists of a capillary mat placed on a level bench so one side extends over the edge of the bench into a trough containing a nutrient solution maintained at a controlled distance below the bench. The nutrient solution is drawn by capillarity up to and over the bench surface. As plants use the nutrient solution or as water evaporates from the media, it is replaced from the trough. The automatic system maintains a constant air/water ratio in the growing media. Study 1: Geraniums were grown in 15-cm pots at 0, 2, and 4 cm CWT. Geraniums at 0 and 2 cm CWT had the greatest leaf area and dry weight. Plants at 0 and 2 cm CWT were more than 25% greater at 4 cm CWT. The roots of plants at 0 cm CWT were concentrated at 2 to 4 cm above the bottom of the container; whereas roots at 2 cm CWT uniformly extended from the center to the bottom. Study 2: Water potential in a coarse and fine textured media was determined at the bottom, middle and top of the container at 0, 2, and 4 cm CWT every 2.5 h during the light period. Water potential was about the same in each media within each CWT treatment. At the container bottom at 0 CWT water potential was 0; whereas the water potential at 2 and 4 CWT was lower. The water potential from top to bottom decreased slightly about mid afternoon on a sunny day when water demand was the greatest. The CWT system is potentially a commercially adaptable irrigation system for container crops. It also is a cheap, reliable tool for studying water stress on the crop growth and quality.
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Claims 9
Claim · model-written summary
Geraniums at 0 and 2 cm CWT had the greatest leaf area and dry weight.
GeraniumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Geraniums at 0 and 2 cm CWT had the greatest leaf area and dry weight.”
Claim · model-written summary
Plants at 0 and 2 cm CWT were more than 25% greater than at 4 cm CWT.
Verbatim
e0“Plants at 0 and 2 cm CWT were more than 25% greater at 4 cm CWT.”
t0“Container-grown Plants”
Claim · model-written summary
Roots at 0 cm CWT concentrated 2 to 4 cm above the container bottom.
- Taxon
- PlantsViridiplantaet0
- Organ / stage
- rootse0
- Treatment
- 0 cm CWTe0
- Outcome
- concentrated at 2 to 4 cm above the bottom of the containere0
Not reportedDirection
Verbatim
e0“The roots of plants at 0 cm CWT were concentrated at 2 to 4 cm above the bottom of the container”
t0“Container-grown Plants”
Claim · model-written summary
Roots at 2 cm CWT extended uniformly from the center to the bottom.
- Taxon
- PlantsViridiplantaet0
- Organ / stage
- rootse0
- Treatment
- 2 cm CWTe0
- Outcome
- uniformly extended from the center to the bottome0
Not reportedDirection
Verbatim
e0“roots at 2 cm CWT uniformly extended from the center to the bottom.”
t0“Container-grown Plants”
Claim · model-written summary
Water potential was about the same in coarse and fine media within each CWT treatment.
- Taxon
- PlantsViridiplantaet0
- Outcome
- Water potentiale0
- Direction
- about the samee0
Verbatim
e0“Water potential was about the same in each media within each CWT treatment.”
t0“Container-grown Plants”
Claim · model-written summary
Bottom water potential at 0 CWT was zero, whereas at 2 and 4 CWT it was lower.
Verbatim
e0“At the container bottom at 0 CWT water potential was 0; whereas the water potential at 2 and 4 CWT was lower.”
t0“Container-grown Plants”
Claim · model-written summary
Water potential from top to bottom decreased slightly in mid afternoon on a sunny day.
- Taxon
- PlantsViridiplantaet0
- Outcome
- water potentiale0
- Direction
- decreased slightlye0
- Qualifier
- about mid afternoon on a sunny daye0
Verbatim
e0“The water potential from top to bottom decreased slightly about mid afternoon on a sunny day when water demand was the greatest.”
t0“Container-grown Plants”
Claim · model-written summary
The CWT system was judged potentially commercially adaptable for container crops.
- Taxon
- PlantsViridiplantaet0
- Outcome
- commercially adaptable irrigation systeme0
- Qualifier
- potentiallye0
Verbatim
e0“The CWT system is potentially a commercially adaptable irrigation system for container crops.”
t0“Container-grown Plants”
Claim · model-written summary
The CWT system was judged a cheap, reliable tool for studying crop water stress.
- Taxon
- PlantsViridiplantaet0
- Outcome
- cheap, reliable toole0
Not reportedComparatorValue
Verbatim
e0“It also is a cheap, reliable tool for studying water stress on the crop growth and quality.”
t0“Container-grown Plants”
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- no effect
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See all 16 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.