Abstract
Abstract In a field experiment conducted to study the water and nitrogen economy of rainfed rice ( Oryza sativa L. variety, ‘Tongil’) grown on montmorillonitic clay, much more water was lost from nonpuddled soil than from puddled soil. In rainfed treatments, the crop suffered from moisture stress for 2 weeks during panicle development. During this time soil moisture tension 10 cm deep was 70 centibars in nonpuddled soil compared with 25 centibars in puddled soil. Water‐use efficiency was calculated by dividing the grain yield values by the amount of water received from rain or applied through irrigation. Water‐use efficiency of rice in the irrigated controls, was 2.5 times higher in the puddled soil than in the nonpuddled soil. Ammonium and nitrate nitrogen in the soil and plant nitrogen were determined periodically. The large losses of water from nonpuddled soil caused greater nitrogen losses and less nitrogen uptake by rice at all stages of growth. As a result, grain yields of rice grown on nonpuddled soil were significantly lower than yields of rice grown on puddled soil, with or without nitrogen.
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Claims 7
Claim · model-written summary
Nonpuddled soil lost much more water than puddled soil.
- Taxon
- Rice
Oryza sativae1 - Treatment
- nonpuddled soile0
- Outcome
- water was loste0
- Direction
- much moree0
- Comparator
- puddled soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“much more water was lost from nonpuddled soil than from puddled soil.”
e1“Rainfed Rice”
Claim · model-written summary
Rainfed rice suffered moisture stress for two weeks during panicle development.
- Taxon
- RiceOryza sativae1
- Organ / stage
- panicle developmente0
- Outcome
- moisture stresse0
- Value
- 2 weekse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rainfed treatments, the crop suffered from moisture stress for 2 weeks during panicle development.”
e1“Rainfed Rice”
Claim · model-written summary
Soil moisture tension was 70 centibars in nonpuddled soil versus 25 in puddled soil.
- Taxon
- RiceOryza sativae1
- Treatment
- nonpuddled soile0
- Outcome
- soil moisture tensione0
- Value
- 70 centibarse0
- Qualifier
- 25 centibarse0
- Comparator
- puddled soile0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During this time soil moisture tension 10 cm deep was 70 centibars in nonpuddled soil compared with 25 centibars in puddled soil.”
e1“Rainfed Rice”
Claim · model-written summary
Puddling raised water use efficiency 2.5 fold in irrigated rice controls.
- Taxon
- riceOryza sativae0
- Treatment
- puddled soile0
- Outcome
- Water‐use efficiencye0
- Direction
- highere0
- Value
- 2.5 timese0
- Qualifier
- irrigated controlse0
- Comparator
- nonpuddled soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water‐use efficiency of rice in the irrigated controls, was 2.5 times higher in the puddled soil than in the nonpuddled soil.”
e1“Rainfed Rice”
Claim · model-written summary
Nonpuddled soil caused greater nitrogen losses.
- Taxon
- riceOryza sativae0
- Treatment
- nonpuddled soile0
- Outcome
- nitrogen lossese0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The large losses of water from nonpuddled soil caused greater nitrogen losses and less nitrogen uptake by rice at all stages of growth.”
e1“Rainfed Rice”
Claim · model-written summary
Nonpuddled soil reduced rice nitrogen uptake throughout growth.
- Taxon
- riceOryza sativae0
- Treatment
- nonpuddled soile0
- Outcome
- nitrogen uptake by ricee0
- Direction
- lesse0
- Qualifier
- all stages of growthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The large losses of water from nonpuddled soil caused greater nitrogen losses and less nitrogen uptake by rice at all stages of growth.”
e1“Rainfed Rice”
Claim · model-written summary
Nonpuddled rice had significantly lower grain yields with or without nitrogen.
- Taxon
- riceOryza sativae0
- Treatment
- nonpuddled soile0
- Outcome
- grain yieldse0
- Direction
- lowere0
- Qualifier
- with or without nitrogene0
- Comparator
- puddled soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yields of rice grown on nonpuddled soil were significantly lower than yields of rice grown on puddled soil, with or without nitrogen.”
e1“Rainfed Rice”
The same questions in other papers
tillage · physiology: water · Oryza sativa (rice)Positive and negative results
39 papers in the same direction as this paper · 2 in the opposite direction · 2 reporting no difference from an alternative
- negative
- negative
- no effect
40 papers more in this group
See all 44 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.