Abstract
In the rice growing area of Kenya’s highlands, the development of a water-saving rice cultivation system is a key strategy because the shortage of irrigation water is a frequently occurring problem. The purpose of this study was to investigate the effect of alternate wetting and drying (AWD) on the growth and yield of rice under the unique cultivation environment of tropical highlands. Field experiments were performed over a period of four years (2014–2017) in a paddy field. Dry matter production of a lowland variety, Basmati 370, was greater under continuous flooding (CF) than under AWD. In years with low minimum temperature (less than 15 °C) during the reproductive and ripening stages, filled grain ratios were significantly higher under AWD than under CF. Accordingly, higher dry matter production under CF did not contribute to grain yield. In the years when rice was not exposed to low minimum temperature during the reproductive and ripening stages, filled grain ratio did not decrease even under CF. Therefore, there was no difference between filled grain ratio under AWD and CF. Our results indicated that AWD could mitigate the decline in grain filling, induced by low minimum temperature during the reproductive and ripening stages in Basmati 370, under the cultivation conditions in tropical highlands. Although AWD may reduce the above-ground biomass, its mitigation effect on grain filling could outweigh this drawback and can still be beneficial to rice farmers in the tropical highlands.
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Claims 6
Claim · model-written summary
Dry matter production of rice cultivar Basmati 370 was greater under continuous flooding than under alternate wetting and drying.
- Taxon
- rice
Oryza sativae1 - Material
- Basmati 370e0
- Treatment
- continuous flooding (CF)e0
- Outcome
- Dry matter productione0
- Direction
- greatere0
- Comparator
- AWDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter production of a lowland variety, Basmati 370, was greater under continuous flooding (CF) than under AWD”
e1“growth and yield of rice”
Claim · model-written summary
In years with low minimum temperature, filled grain ratios of rice were significantly higher under alternate wetting and drying than under continuous flooding.
- Taxon
- riceOryza sativae2
- Treatment
- AWDe0
- Outcome
- filled grain ratiose0
- Direction
- highere0
- Qualifier
- low minimum temperaturee1
- Comparator
- CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“filled grain ratios were significantly higher under AWD than under CF”
e1“In years with low minimum temperature”
e2“growth and yield of rice”
Claim · model-written summary
In years without low minimum temperature during reproductive and ripening stages, filled grain ratio did not differ between AWD and CF.
- Taxon
- riceOryza sativae2
- Treatment
- AWDe0
- Outcome
- filled grain ratioe0
- Direction
- no differencee0
- Qualifier
- rice was not exposed to low minimum temperaturee1
- Comparator
- CFe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no difference between filled grain ratio under AWD and CF”
e1“In the years when rice was not exposed to low minimum temperature”
e2“growth and yield of rice”
Claim · model-written summary
Higher dry matter production under continuous flooding did not contribute to grain yield.
- Taxon
- riceOryza sativae1
- Outcome
- grain yielde0
- Qualifier
- higher dry matter production under CF did not contributee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher dry matter production under CF did not contribute to grain yield”
e1“growth and yield of rice”
Claim · model-written summary
AWD may reduce above-ground biomass.
- Taxon
- riceOryza sativae1
- Treatment
- AWDe0
- Outcome
- above-ground biomasse0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AWD may reduce the above-ground biomass”
e1“growth and yield of rice”
Claim · model-written summary
The mitigation effect of AWD on grain filling can outweigh its biomass drawback and benefit rice farmers in tropical highlands.
- Taxon
- riceOryza sativae0
- Outcome
- mitigation effect on grain fillinge0
- Setting
- tropical highlandse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its mitigation effect on grain filling could outweigh this drawback and can still be beneficial to rice farmers in the tropical highlands”
The same questions in other papers
irrigation · growth · Oryza sativa (rice)Positive and negative results
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- positive
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