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<p>The yield and quality of rice are easily affected by climatic conditions. Selecting a suitable sowing date, in accordance with local climatic conditions, is crucial for achieving high yields and high-quality rice. However, regarding climate resource utilisation, the effects of sowing date on rice yield and grain quality are not well-documented. In this research, <i>indica</i> hybrids Fengliangyouxiang 1 (FL-1) and Pengyou1269 (PY1269) were selected as the plant materials, with 10 different sowing times in 2020. In 2021, only FL-1 was chosen as the plant material, with 15 sowing times. Field experiments were conducted to investigate the relationships among rice growth duration, grain yield, and quality across varying sowing dates. The results indicated that temperature is a primary limiting factor compared to solar radiation, regardless of sowing date. The delayed sowing dates shortened the growth duration before the heading stage due to high temperatures, but lengthened it during the grain-filling stage due to lower temperatures. The findings exhibited that mean temperature (MT), maximum temperature (MaT), effective accumulated temperature (EAT), and minimum temperature (MiT) after the heading stage were lower than 27.8 ℃, 32.1 ℃, 649.2 ℃, and 23.8 ℃, respectively, while the temperature difference (TD) after the heading stage was higher than 6.4 ℃. A lower temperature during the grain-filling stage is more conducive to improvements in grain yield and quality (e.g., increased seed setting rate, higher grain number per panicle, etc.). This research recommended that the optimal sowing period for the popular variety FL-1 is June 20 (S14), which effectively avoids meteorological disasters and efficiently utilises climate resources, thereby achieving the best balance between grain yield and rice quality in the Jianghuai region.</p>

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Effects of Sowing Date on Yield and Quality Formation of Indica Rice in the Jianghuai Region

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Wenge Wu,
  • Zhong Li,
  • Hui Su,
  • Min Xi,
  • Muhammad Ahmad Hassan,
  • Yongjin Zhou,
  • Youzun Xu,
  • Jinhua Chen,
  • Hupo Li,
  • Yaya Yang,
  • Fulai Yan

摘要

The yield and quality of rice are easily affected by climatic conditions. Selecting a suitable sowing date, in accordance with local climatic conditions, is crucial for achieving high yields and high-quality rice. However, regarding climate resource utilisation, the effects of sowing date on rice yield and grain quality are not well-documented. In this research, indica hybrids Fengliangyouxiang 1 (FL-1) and Pengyou1269 (PY1269) were selected as the plant materials, with 10 different sowing times in 2020. In 2021, only FL-1 was chosen as the plant material, with 15 sowing times. Field experiments were conducted to investigate the relationships among rice growth duration, grain yield, and quality across varying sowing dates. The results indicated that temperature is a primary limiting factor compared to solar radiation, regardless of sowing date. The delayed sowing dates shortened the growth duration before the heading stage due to high temperatures, but lengthened it during the grain-filling stage due to lower temperatures. The findings exhibited that mean temperature (MT), maximum temperature (MaT), effective accumulated temperature (EAT), and minimum temperature (MiT) after the heading stage were lower than 27.8 ℃, 32.1 ℃, 649.2 ℃, and 23.8 ℃, respectively, while the temperature difference (TD) after the heading stage was higher than 6.4 ℃. A lower temperature during the grain-filling stage is more conducive to improvements in grain yield and quality (e.g., increased seed setting rate, higher grain number per panicle, etc.). This research recommended that the optimal sowing period for the popular variety FL-1 is June 20 (S14), which effectively avoids meteorological disasters and efficiently utilises climate resources, thereby achieving the best balance between grain yield and rice quality in the Jianghuai region.