Crops ›› 2021, Vol. 37 ›› Issue (6): 164-170.doi: 10.16035/j.issn.1001-7283.2021.06.026

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Effects of Main Season Stubble Height on Ratoon Season Yield and Rice Quality

Li Yang1(), Yang Xiaolong1, Wang Benfu1, Zhang Zhisheng1, Chen Shaoyu1, Li Jinlan2, Cheng Jianping1()   

  1. 1Food Crops Institute, Hubei Academy of Agricultural Sciences/Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Wuhan 430064, Hubei, China
    2Huanggang Academy of Agricultural Sciences, Huanggang 438000, Hubei, China
  • Received:2021-02-02 Revised:2021-10-21 Online:2021-12-15 Published:2021-12-16
  • Contact: Cheng Jianping E-mail:liylcy@163.com;chjp609@163.com

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Abstract:

The effects of stubble height in the main season on yield formation and rice quality of the ratoon season were studied to provide theoretical basis for achieving high yield and quality in the ratoon season. Hybrid rice Xinliangyou 223 and conventional rice Huanghuazhan were used as experimental materials. Three stubble heights, 40(high stubble, HS), 20 (middle stubble, MS) and 5cm (low stubble, LS) were designed in main season, and components of different nodes yield, ratoon season rice quality, leaf area index, nitrogen content, net photosynthetic rate (Pn) in ratoon season were studied. The results showed that the yield of the two cultivars decreased with the decrease of stubble height, and the yield of HS treatment (4.13t/ha) was 9.9% and 16.3% higher than that of MS and LS treatments. With the decrease of stubble height, the milling quality of ratooning rice was significantly decreased, and the head rice rate of Xinliangyou 223 was significantly decreased than that of Huanghuazhan. The HS treatment of Xinliangyou 223 was 26.8% and 59.7% higher than that of MS and LS treatments, respectively. With the decrease of stubble height, appearance quality of rice was significantly improved, protein contents decreased, and amylose contents had no significant change. Nitrogen contents of main stems, leaves and new buds in ratoon season were significantly positively correlated with yield, and Pn of HS and MS treatments were significantly higher than that of LS treatment. In conclusion, according to the characteristics of varieties, the stubble height in the main season should be adjusted to promote the synergistic improvement of yield and quality in the ratoon season.

Key words: Ratooning rice, Stubble height, Yield, Rice quality, Photosynthetic characteristics

Table 1

Effects of different treatments on yield and its components of ratoon season rice"

年份
Year		 品种
Variety		 处理
Treatment		 有效穗数
Effective panicles (×106/hm2)		 穗粒数
Spikelets per panicle		 结实率
Seed-setting rate (%)		 千粒重
1000-grain weight (g)		 产量
Yield (t/hm2)
2015 新两优223 HS 3.92a 62.5d 73.7c 25.3b 4.45a
MS 3.36b 68.2c 74.1c 25.4b 4.41a
LS 2.61d 74.4b 72.7c 27.1a 3.83b
黄华占 HS 3.13bc 59.4d 86.5a 24.0c 3.70c
MS 2.98c 63.1d 85.5a 22.2d 3.51d
LS 2.59d 84.4a 78.7b 19.6e 3.32d
2017 新两优223 HS 3.97a 64.8c 74.0c 25.2b 4.75a
MS 3.27b 62.0c 73.8c 25.1b 3.91b
LS 2.70d 74.5b 72.4c 26.9a 3.91b
黄华占 HS 2.99c 58.6c 85.8a 24.3c 3.60c
MS 2.93cd 58.7c 85.9a 21.7d 3.18d
LS 2.10e 96.7a 78.5b 19.8e 3.13e

Table 2

Effects of different treatments on grain quality of ratoon season rice"

年份
Year		 品种
Variety		 处理
Treatment		 糙米率
Brown rice rate (%)		 整精米率
Head rice rate (%)		 垩白粒率
Chalky grain rate (%)		 垩白度
Chalkiness degree		 直链淀粉含量
Amylose content (%)		 蛋白质含量
Protein content (%)
2015 新两优223 HS 78.62a 44.56c 14.30a 2.37a 14.95b 9.69a
MS 78.13a 35.28c 12.99b 1.70b 15.09b 9.56a
LS 76.11b 28.29d 11.07c 1.47b 15.04b 9.22b
黄华占 HS 75.40bc 65.00a 8.92d 2.29a 18.30a 7.27c
MS 74.10c 63.70a 7.58e 1.79b 17.70a 6.27d
LS 71.90d 62.90a 6.07f 1.66b 18.10a 5.98e
2017 新两优223 HS 77.00a 44.20c 14.20a 2.40a 14.90b 9.70a
MS 76.00ab 34.70d 12.70b 1.71bc 15.10b 9.61a
LS 74.90bc 27.30e 11.20c 1.49c 15.20b 9.21b
黄华占 HS 76.50ab 64.20a 8.84d 2.28a 18.40a 7.27c
MS 73.50cd 63.30ab 8.54e 1.78b 18.10a 6.26d
LS 71.70d 61.50b 5.99f 1.66bc 18.40a 5.84e

Table 3

Statistical analysis of the influence of various factors on rice quality"

项目
Item		 糙米率
Brown rice rate (%)		 整精米率
Head rice rate (%)		 垩白粒率
Chalky grain rate (%)		 垩白度
Chalkiness degree		 直链淀粉含量
Amylose content (%)		 蛋白质含量
Protein content (%)
年份Year (Y) * ns ns ns * ns
品种Variety (V) ** ** ** ns ** **
处理Treatment (T) ** ** ** ** ns **
品种×年份V×Y * ns ns ns ns ns
处理×年份T×Y ns ns ns ns ns ns
处理×品种T×V * ** ns ns * **
处理×品种×年份
T×V×Y		 ns ns ns ns ns ns

Fig.1

Comparison of LAI between the two rice cultivars at the heading stage in ratoon season Different lowercase letters indicate significant difference at 0.05 level"

Fig.2

Correlations between nitrogen contents of vegetative organs and yield in ratoon season"

Table 4

Effects of different treatments on photosynthetic characteristics of rice at heading stage"

年份Year 品种Variety 处理Treatment Pn [μmol/(m2·s)] Gs [mmol/(m2·s)] Ci (μmol/mol) Tr [mmol/(m2·s)]
2015 新两优223 HS 23.0a 0.723b 312.0ab 7.49a
MS 22.5a 0.612c 285.0b 7.22a
LS 19.3d 0.275e 228.4c 7.33a
黄华占 HS 22.1a 0.912a 339.2a 6.40b
MS 21.0b 0.604c 310.8ab 5.83c
LS 20.3c 0.516d 304.7b 5.51c
2017 新两优223 HS 22.8a 0.658b 301.5b 9.10a
MS 22.4a 0.502c 274.8c 8.76a
LS 21.5b 0.218d 266.8c 8.86a
黄华占 HS 22.1a 0.854a 340.2a 6.52b
MS 21.6b 0.616b 327.0ab 6.34b
LS 19.4c 0.424c 326.7ab 4.20c
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