Effects of alternate wetting and drying on lodging resistance and yield of direct-seeded ratooning rice

doi:10.14088/j.cnki.issn0439-8114.2023.12.004

Abstract

Abstract: To choose a suitable water management method for direct-seeded ratoon rice（Oryza sativa L.）, a field experiment was conducted using ratooning rice Fengliangyouxiang No.1 with three irrigation regimes, including conventional irrigation （CI）, alternate wetting and moderate drying irrigation （AWMD） and alternate wetting and severe drying irrigation （AWSD）, the effects of alternate wetting and drying irrigation on lodging index of rice stem, morphological characters of rice stem, yield in main and ratoon seasons and the relationship between lodging and yield were studied. The results showed that the yield of main season rice was the highest in alternate wetting and moderate drying irrigation treatment, which was 8.53 t/hm², and the grain number per panicle in alternate wetting and moderate drying irrigation treatment increased significantly by 26.11% and 3.73% compared with conventional irrigation and alternate wetting and severe drying irrigation treatment. The yield of ratoon season rice under alternate wetting and moderate drying irrigation treatment （7.12 t/hm²） was 14.47% and 9.54% higher than that of conventional irrigation and alternate wetting and severe drying irrigation. The annual yield of ratoon rice under alternate wetting and moderate drying irrigation was significantly higher than that of conventional irrigation and alternate wetting and severe drying irrigation（P<0.05）. Alternate wetting and moderate drying irrigation treatment reduced the lodging index of ratoon rice, improved its bending resistance, shifted the height of the stem center of gravity downwards, enhanced the thickness of the internode and stem wall, and thus improved the lodging resistance of ratoon rice. There was a significant positive correlation between ratoon rice yield and the lodging resistance（P<0.05）. In conclusion, the lodging resistance and yield of direct-seeded ratooning rice could be improved by alternate wetting and moderate drying irrigation.

Key words: direct-seeded ratooning rice（Oryza sativa L.）, alternate wetting and drying, lodging resistance, yield

CLC Number:

S511

LI Yi-yue, LI Yang, ZHANG Zuo-lin, WANG Ben-fu, ZHANG Zhi-sheng, CHENG Jian-ping. Effects of alternate wetting and drying on lodging resistance and yield of direct-seeded ratooning rice[J]. HUBEI AGRICULTURAL SCIENCES, 2023, 62(12): 13-17.

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