Crops ›› 2019, Vol. 35 ›› Issue (5): 186-191.doi: 10.16035/j.issn.1001-7283.2019.05.030

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Effects of Different Sowing Dates on Dry Matter Accumulation of Direct-Seeded Early Rice

Duan Licheng1,3,Guo Ruige1,Zhang Kun1,Zhang Qiming2,Liu Dan3,Yang Aiping1,Gui Baoyu1,Jin Guohua1,Cai Zhe1   

  1. 1 Jiangxi Agricultural Meteorological Center, Nanchang 330096, Jiangxi, China
    2 Yichun Meteorological Office, Yichun 336000, Jiangxi, China
    3 Jiangxi Institute of Meteorological Research, Nanchang 330045, Jiangxi, China
  • Received:2019-04-15 Revised:2019-07-22 Online:2019-10-15 Published:2019-11-07
  • Contact: Zhe Cai

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Abstract:

In order to reveal the impacts of sowing date on dry matter accumulation of individual and population in direct sowed early rice, an interval sowing experiment was conducted with indica rice Zhongzao 35 and Zhongzao 39 as experiment materials, to analyzing the difference of dry matter accumulation and transport in direct seeded early rice. The results showed that the accumulated temperature gradually decreased during the whole growth period and increased after heading with the delay of sowed date. The seedling rate increased with the increase of daily mean temperature before tillering, the correlation between seedling rate and the dry matter accumulation per plant reached 0.83, the correlation between seedling rate and the dry matter accumulation per unit area reached 0.72. With the delay of sowed date, the dry matter transferred from stem and leaf to panicle decreased gradually, the dry matter transfered from stem and leaf per plant, per unit area were negatively correlated with the accumulated temperature after heading. The photosynthetic product per plant decreased and the photosynthetic product per unit area increased with the increase of accumulated temperature after heading. So early sowing could ensure certain basic seedlings to coordinate the relationship of accumulation and transformation of dry matter of individuals and groups to obtain high yields.

Key words: Early rice, Sowing date, Accumulated temperature, Dry matter

Fig.1

Temperature change during the whole growth period of rice"

Table 1

Linear relationship between accumulated temperature and sowing date"

品种Variety 项目Project 方程Equation R2
中早35 Zhongzao 35 抽穗后积温与播期Accumulated temperature and sowing date after heading y=19.287x+759.62 0.89
全生育期积温与播期Accumulated temperature and sowing date during the whole growth period y=-6.5567x+2616.2 0.54
中早39 Zhongzao 39 抽穗后积温与播期Accumulated temperature and sowing date after heading y=20.945x+748.90 0.85
全生育期积温与播期Accumulated temperature and sowing date during the whole growth period y=-2.6442x+2559.9 0.05

Table 2

Relationship between sowing date and temperature, seedling rate"

品种
Variety		 项目
Project		 方程
Equation		 成苗率与单株干物质积累量相关性
Correlation between seedling rate and dry matter accumulation per plant		 成苗率与单位面积干物质积累量相关性
Correlation between seedling rate and dry matter accumulation per unit area
中早35
Zhongzao 35		 成苗率与播期
Seedling rate and sowing date		 y=2.9227x+36.042 -0.83** 0.72*
分蘖前日平均气温与播期
Average daily temperature and
sowing date before the tillering		 y=0.6304x+15.185 - -
中早39
Zhongzao 39		 成苗率与播期
Seedling rate and sowing date		 y=3.9253x+29.658 -0.95** 0.73*
分蘖前日平均气温与播期
Average daily temperature and
sowing date before the tillering		 y=0.8851x+14.519 - -

Table 3

Relationship between total dry matter accumulation and accumulated temperature"

品种
Variety		 项目
Project		 方程
Equation		 干物质积累量与积温的相关性
Correlation of dry matter accumulation
and accumulated temperature
中早35
Zhongzao 35		 单株总干物质积累量与播期
Total dry matter accumulation per plant and sowing date		 y=-0.3735x+12.375 -0.75*
单位面积总干物质积累量与播期
Total dry matter accumulation per unit area and sowing date		 y=324.91x+10327.00 -0.34
中早39
Zhongzao 39		 单株总干物质积累量与播期
Total dry matter accumulation per plant and sowing date		 y=-0.6439x+12.823 -0.09
单位面积总干物质积累量与播期
Total dry matter accumulation per unit area and sowing date		 y=216.27x+9335.10 -0.04

Table 4

Changes of dry matter output and transformation in organs %"

播期
Sowing
date		 中早35 Zhongzao 35 中早39 Zhongzao 39
干物质输出率
Dry matter output rate		 干物质转化率
Dry matter transformation rate		 干物质输出率
Dry matter output rate		 干物质转化率
Dry matter transformation rate
茎Stem 叶Leaf 茎Stem 叶Leaf 茎Stem 叶Leaf 茎Stem 叶Leaf
B1 29.60 20.10 25.94 6.29 22.62 22.49 22.74 9.80
B2 24.89 19.01 24.71 6.14 17.12 16.43 17.98 5.87
B3 20.87 18.83 21.93 6.09 13.24 11.91 11.17 4.14
B4 18.85 17.71 19.21 5.60 13.48 11.72 11.59 4.10
B5 19.65 16.48 15.42 5.39 13.05 9.57 11.27 3.48
B6 14.96 14.04 13.22 4.78 6.92 10.47 5.67 3.48
B7 17.57 12.89 12.62 4.89 8.47 9.91 6.87 3.91
B8 10.44 11.72 11.01 4.74 6.24 10.12 5.57 4.18
B9 11.33 11.27 11.35 4.25 8.81 9.10 8.69 4.47

Table 5

Correlation between dry matter transport and accumulated temperature after heading"

品种Variety 项目Project 茎输出量Stem output 叶输出量Leaf output 光合产物Photosynthate
中早35 Zhongzao 35 单株Per plant -0.76* -0.79** -0.66*
单位面积Per unit area -0.46 -0.69* -0.52
中早39 Zhongzao 39 单株Per plant -0.60 -0.47 -0.12
单位面积Per unit area -0.59 -0.50 -0.40
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