Abstract
The repeated use of a limited number of herbicides has led to the development of resistant weed species in California rice ( Oryza sativa L.). Competitive rice cultivars could help reduce herbicide dependency and decrease selective pressure for resistance. We conducted field experiments to determine if differences in competitive ability existed between two semidwarf cultivars of water‐seeded rice. Cultivars M‐202 and A‐301 were grown on Stockton clay soil at two seed rates (84 and 168 kg ha −1 ) in 1996 and four seed rates (56, 112, 168, and 224 kg ha −1 ) in 1997. Molinate ( S ‐ethyl hexahydro‐1 H ‐azepine‐1‐carbothioate) and propanil [ N ‐(3,4‐dichlorophenyl)propanamide] were used to control a mixed infestation of watergrass [ Echinochloa oryzoides (Ard.) Fritsch, E. phyllopogon (Stapf) Koss] in 1996 and 1997, respectively. Molinate (0 and 4.5 kg a.i. ha −1 ) was applied in 1996, and propanil (0, 1, 2 and 4 kg a.i. ha −1 ) was applied in 1997. M‐202 was taller, produced more leaf dry weight, had greater light interception, and reduced watergrass biomass more than A‐301 in both years of the study. The more competitive M‐202 also had higher yields than A‐301 under weedy and weed‐free conditions. Watergrass growth was not affected by rice seed rates in either year. This study suggests that herbicide rates could be reduced and weed control could be improved if more competitive cultivars were developed for water‐seeded rice.
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Claims 5
Claim · model-written summary
M‐202 was taller, had more leaf dry weight and intercepted more light than A‐301.
- Taxon
- rice
Oryza sativae1 - Material
- M‐202e0
- Outcome
- taller, produced more leaf dry weight, had greater light interceptione0
- Direction
- moree0
- Comparator
- A‐301e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“M‐202 was taller, produced more leaf dry weight, had greater light interception, and reduced watergrass biomass more than A‐301 in both years of the study”
e1“rice ( Oryza sativa L.)”
Claim · model-written summary
M‐202 reduced watergrass biomass more than A‐301.
- Taxon
- riceOryza sativae2
- Material
- M‐202e1
- Interactor
- watergrasse0weed
- Outcome
- watergrass biomasse0
- Direction
- reducede0
- Comparator
- A‐301e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced watergrass biomass more than A‐301 in both years of the study”
e1“M‐202 was taller”
e2“rice ( Oryza sativa L.)”
Claim · model-written summary
M‐202 yielded more than A‐301 in weedy and weed-free conditions.
- Taxon
- riceOryza sativae1
- Material
- M‐202e0
- Outcome
- yieldse0
- Direction
- highere0
- Qualifier
- weedy and weed‐free conditionse0
- Comparator
- A‐301e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The more competitive M‐202 also had higher yields than A‐301 under weedy and weed‐free conditions”
e1“rice ( Oryza sativa L.)”
Claim · model-written summary
Rice seeding rates did not affect watergrass growth.
- Taxon
- riceOryza sativae1
- Treatment
- rice seed ratese0
- Interactor
- Watergrasse0weed
- Outcome
- Watergrass growthe0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Watergrass growth was not affected by rice seed rates in either year”
e1“rice ( Oryza sativa L.)”
Claim · model-written summary
The authors suggest developing competitive water-seeded rice cultivars to reduce herbicide rates and improve weed control.
- Taxon
- riceOryza sativae0
- Outcome
- more competitive cultivars were developed for water‐seeded ricee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“herbicide rates could be reduced and weed control could be improved if more competitive cultivars were developed for water‐seeded rice”
The same questions in other papers
density · growth · Oryza sativa (rice)Positive and negative results
22 papers in the same direction as this paper · 73 in the opposite direction
- positive
- positive
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See all 96 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.