Role of Canopy Coverage in Water Use Efficiency of Lowland Rice in Early Growth Period in Semi-Arid Region
An appropriate combination of rice cultivar and cropping system that maximizes water use efficiency (WUE) may improve yield of rainfed lowland rice. In the paddy field, a large amount of water is consumed by evaporation during the early growth period, and it can be reduced by canopy coverage especia...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2013-01-01
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| Series: | Plant Production Science |
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| Online Access: | http://dx.doi.org/10.1626/pps.16.12 |
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| author | Tetsuji Suzuki Takeshi Ohta Yasuhiro Izumi Luke Kanyomeka Osmund Mwandemele Jun-Ichi Sakagami Koji Yamane Morio Iijima |
| author_facet | Tetsuji Suzuki Takeshi Ohta Yasuhiro Izumi Luke Kanyomeka Osmund Mwandemele Jun-Ichi Sakagami Koji Yamane Morio Iijima |
| author_sort | Tetsuji Suzuki |
| collection | DOAJ |
| description | An appropriate combination of rice cultivar and cropping system that maximizes water use efficiency (WUE) may improve yield of rainfed lowland rice. In the paddy field, a large amount of water is consumed by evaporation during the early growth period, and it can be reduced by canopy coverage especially in semi-arid regions. Therefore, we evaluated the role of canopy coverage in WUE of rice in the early growth period in semi-arid region. A pot experiment was conducted in Namibia to investigate the genotypic and species difference in WUE, and another pot and a field experiment were conducted to investigate the effects of planting density on WUE. Although no significant difference was observed among species, the mean WUE was in the decreasing order of Oryza sativa, and Oryza glaberrima followed by the interspecific progenies including NERICA. In contrast, there was a significant difference in WUE at the genotypic level. Highly tillering genotypes such as WAB1159-2-12-11-5-1 and WITA 2 showed a high WUE. Furthermore, WUE was significantly correlated with the number of tillers (R2 = 0.453), and higher planting density resulted in a higher WUE. In contrast, stomatal conductance had no significant correlation with WUE (R2 = 0.081). Thus, the physical conditions affected by number of tillers and planting density had greater impacts on WUE than physiological characteristics such as stomatal conductance. The suppression of surface water evaporation by coverage was significant, probably contributing to WUE improvement. To increase WUE in semi-arid regions, we recommend the increase of canopy coverage and higher planting density. |
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| issn | 1343-943X 1349-1008 |
| language | English |
| last_indexed | 2024-12-10T23:16:24Z |
| publishDate | 2013-01-01 |
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| record_format | Article |
| series | Plant Production Science |
| spelling | doaj.art-5a4929ed4b3c4b4698b1c54a59902d772022-12-22T01:29:49ZengTaylor & Francis GroupPlant Production Science1343-943X1349-10082013-01-01161122310.1626/pps.16.1211645134Role of Canopy Coverage in Water Use Efficiency of Lowland Rice in Early Growth Period in Semi-Arid RegionTetsuji Suzuki0Takeshi Ohta1Yasuhiro Izumi2Luke Kanyomeka3Osmund Mwandemele4Jun-Ichi Sakagami5Koji Yamane6Morio Iijima7Nagoya UniversityNagoya UniversityThe University of Shiga PrefectureUniversity of NamibiaUniversity of NamibiaJapan International Research Center for Agricultural SciencesKinki UniversityKinki UniversityAn appropriate combination of rice cultivar and cropping system that maximizes water use efficiency (WUE) may improve yield of rainfed lowland rice. In the paddy field, a large amount of water is consumed by evaporation during the early growth period, and it can be reduced by canopy coverage especially in semi-arid regions. Therefore, we evaluated the role of canopy coverage in WUE of rice in the early growth period in semi-arid region. A pot experiment was conducted in Namibia to investigate the genotypic and species difference in WUE, and another pot and a field experiment were conducted to investigate the effects of planting density on WUE. Although no significant difference was observed among species, the mean WUE was in the decreasing order of Oryza sativa, and Oryza glaberrima followed by the interspecific progenies including NERICA. In contrast, there was a significant difference in WUE at the genotypic level. Highly tillering genotypes such as WAB1159-2-12-11-5-1 and WITA 2 showed a high WUE. Furthermore, WUE was significantly correlated with the number of tillers (R2 = 0.453), and higher planting density resulted in a higher WUE. In contrast, stomatal conductance had no significant correlation with WUE (R2 = 0.081). Thus, the physical conditions affected by number of tillers and planting density had greater impacts on WUE than physiological characteristics such as stomatal conductance. The suppression of surface water evaporation by coverage was significant, probably contributing to WUE improvement. To increase WUE in semi-arid regions, we recommend the increase of canopy coverage and higher planting density.http://dx.doi.org/10.1626/pps.16.12Canopy coverageInterspecific progeniesNERICAOryza glaberrima SteudSemi-arid regionsSolar radiationWater use efficiency |
| spellingShingle | Tetsuji Suzuki Takeshi Ohta Yasuhiro Izumi Luke Kanyomeka Osmund Mwandemele Jun-Ichi Sakagami Koji Yamane Morio Iijima Role of Canopy Coverage in Water Use Efficiency of Lowland Rice in Early Growth Period in Semi-Arid Region Plant Production Science Canopy coverage Interspecific progenies NERICA Oryza glaberrima Steud Semi-arid regions Solar radiation Water use efficiency |
| title | Role of Canopy Coverage in Water Use Efficiency of Lowland Rice in Early Growth Period in Semi-Arid Region |
| title_full | Role of Canopy Coverage in Water Use Efficiency of Lowland Rice in Early Growth Period in Semi-Arid Region |
| title_fullStr | Role of Canopy Coverage in Water Use Efficiency of Lowland Rice in Early Growth Period in Semi-Arid Region |
| title_full_unstemmed | Role of Canopy Coverage in Water Use Efficiency of Lowland Rice in Early Growth Period in Semi-Arid Region |
| title_short | Role of Canopy Coverage in Water Use Efficiency of Lowland Rice in Early Growth Period in Semi-Arid Region |
| title_sort | role of canopy coverage in water use efficiency of lowland rice in early growth period in semi arid region |
| topic | Canopy coverage Interspecific progenies NERICA Oryza glaberrima Steud Semi-arid regions Solar radiation Water use efficiency |
| url | http://dx.doi.org/10.1626/pps.16.12 |
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