期刊
AGRICULTURE-BASEL
卷 12, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/agriculture12101647
关键词
rice; irrigation regime; grain yield; water use efficiency
类别
资金
- National Natural Science Foundation of China [31871559, 32071944, 32272197]
- Six Talent Peaks Project in Jiangsu Province [SWYY-151]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Interdisciplinary High Level Youth Support Project of Yangzhou University
- Hong Kong Research Grants Council [GRF 14177617, 12103219, 12103220, AoE/M-403/16]
- State Key Laboratory of Agrobiotechnology (Strategic Collaborative Projects) of the Chinese University of Hong Kong
Understanding the performance of rice in different irrigation conditions is crucial for achieving high yield and resource use efficiency. This study investigated 12 rice genotypes in the lower reaches of the Yangtze River and found that alternate wetting and drying irrigation significantly improved resource use efficiency and grain yield.
Understanding the performance of rice (Oryza sativa L.) agronomic traits and efficiency in water usage as well as grain yield under various irrigation regimes is crucial to achieving high resource use efficiency and high yield. In this study, 12 mid-season indica rice genotypes that have been grown in the lower reaches of the Yangtze River for the past 80 years were studied in a field experiment for two years under two irrigation regimes, i.e., conventional irrigation (CI) and alternate wetting and drying irrigation (AWD). The results showed that with genotype improvement in irrigation regimes, the total number of spikelets, shoot and root dry weight, root oxidation activity, total leaf area index (LAI), effective LAI, leaf photosynthetic rate, and abscisic acid contents and zeatin + zeatin riboside contents in root bleeding sap were significantly increased at main growth stages. AWD irrigation synchronously increased rice resource use efficiency (water use efficiency (WUE), radiation use efficiency (RUE), and temperature use efficiency (TUE)) and grain yield. Compared to CI, AWD more significantly enhanced the performances of rice genotypes in all studied traits. Based on our findings, a semi-dwarf hybrid rice genotype has great potential for high resource use efficiency and high yield under alternate wetting and drying irrigation, which was attributed to the improved agronomic characteristics and superior root traits.
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