Crops ›› 2016, Vol. 32 ›› Issue (5): 141-146.doi: 10.16035/j.issn.1001-7283.2016.05.024

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Effect of Plants Densities on Population Grain Filling Characteristic of Sorghum Hybrid Liaoza19

Ke Fulai,Zhu Kai,Zou Jianqiu   

  1. Innovation Center,Liaoning Academy of Agricultural Sciences,Shenyang 110161,Liaoning,China
  • Received:2016-04-15 Revised:2016-08-04 Online:2016-10-15 Published:2018-08-26
  • Contact: Jianqiu Zou

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Abstract:

The relationship between characteristics of population grain filling and yield were studied with five planting densities (60 000 plants/hm 2, 75 000 plants/hm 2, 90 000 plants/hm 2, 105 000 plants/hm 2, 120 000 plants/hm 2) of sorghum hybrid Liaoza19 on the field in 2014. The results showed that the dynamic trend of yield with densities was unimodal curve. The yield of middle-density population (90 000 plants/hm 2) was the highest than the others. The logistic equation could be used to simulate population grain filling process of these populations with five planting densities. The maximum population grain filling rate and the mean population grain filling rate of middle density population (90 000 plants/hm 2)were significantly higher than those of the low density population (60 000 plants/hm 2) and the highest density population (120 000 plants/hm 2). The active population grain filling period was not significantly different among the different density treatments. Correlation and regression analysis showed that the population grain filling rate was the main factor affecting sorghum yield. Population grain filling rate at linear growth period (P2) played the most important role for the yield. Therefore increasing P2 is the key way for getting high yield.

Key words: Sorghum, Density, Yield, Grain filling

Table 1

Yield and yield components for sorghum hybrid Liaoza19 under different densities"

密度(株/hm2)
Densities		 单位面积穗数(穗/m2)
Spike number of per square meters		 单穗粒数(粒/穗)
Grain number per spike		 千粒重(g)
1000-grain weight		 产量(kg/hm2)
Yield
60 000 6.5e 3 240.3a 32.23a 6 788.3c
75 000 7.6d 3 156.2b 31.89a 7 649.5b
90 000 9.0c 2 965.4c 30.61b 8 169.4a
105 000 10.2b 2 798.3d 28.51c 8 137.5a
120 000 11.5a 2 515.5e 26.02d 7 527.1b

Fig.1

Curves of population grain filling for sorghum hybrid Liaoza19 under differnt densties"

Table 2

Logistic equation of population grain filling for sorghum hybrid Liaoza19 under different densities"

密度Densities(株/hm2) 模拟方程Simulated equation 决定系数R2
60 000 X2=553.0305/[1+55.3415×EXP(-0.1502×X1)] 0.9531
75 000 X2=598.7996/[1+60.2209×EXP(-0.1564×X1)] 0.9723
90 000 X2=721.3109/[1+40.7673×EXP(-0.1387×X1)] 0.9702
105 000 X2=675.6948/[1+49.9741×EXP(-0.1475×X1)] 0.9769
120 000 X2=646.9632/[1+48.0970×EXP(-0.1425×X1)] 0.9791

"

密度(株/hm2)
Densities		 达最大灌浆速率的时间
Days from silking to highest population grain filling rate (d)Tmax		 最大灌浆速率
Highest population grain filling rate[g/(d·m2)]Gmax		 平均灌浆速率
Mean population grain filling rate [g/(d·m2)] $\bar{G}$ 		子粒活跃灌浆期
Active population grain filling period(d)D
60 000 26.7b 20.775c 13.85c 39.9c
75 000 26.2b 23.415b 15.61b 38.4d
90 000 26.7b 25.005a 16.67a 43.3a
105 000 26.5b 24.915a 16.61a 40.7c
120 000 27.2a 23.040b 15.36b 42.1b

Fig.2

Curves of population grain filling rate for sorghum hybrid Liaoza19 under different densities"

"

达最大灌浆速率的时间
Days from silking to highest population grain filling rate (d)Tmax		 最大灌浆速率
Highest population grain filling rate [g/(d·m2)]Gmax		 平均灌浆速率
Mean population grain filling rate [g/(d·m2)] $\bar{G}$ 		子粒活跃灌浆期
Active population grain filling period(d)D
Tmax 1
Gmax -0.290 1
$\bar{G}$ -0.281 0.998** 1
D 0.732* 0.175 0.172 1
产量Yield -0.049 0.906** 0.908** 0.142

Table 5

Parameters of population grain filling characteristics for sorghum hybrid Liaoza19 under different densities in different grain stages"

密度(株/hm2) t1(d) t2(d) t3(d) T1(d) T2(d) T3(d) P1[g/(d·m2)] P2[g/(d·m2)] P3[g/(d·m2)]
60 000 13.3 30.9 57.3 13.3a 17.5b 26.4b 4.90e 16.81c 7.09c
75 000 13.3 30.2 55.6 13.3a 16.8b 25.4b 5.30d 18.95b 7.99b
90 000 12.2 31.2 59.9 12.2a 19.0a 28.6a 6.96a 20.24a 8.54a
105 000 12.9 30.7 57.7 12.9a 17.9ab 26.9ab 6.19b 20.16a 8.51a
120 000 13.1 31.6 59.4 13.1a 18.5a 27.9a 5.84c 18.65b 7.87b

Table 6

Correlation analysis for parameters of population grain filling characteristics and yield in different grain stages"

产量
Yield		 T1 T2 T3 P1 P2 P3
产量Yield 1
T1 -0.716 1
T2 0.437 -0.808* 1
T3 0.421 -0.801 0.999** 1
P1 0.870* -0.944** 0.805 0.795 1
P2 0.998** -0.716 0.438 0.422 0.870* 1
P3 0.996** -0.716 0.440 0.424 0.871* 0.995** 1

Table 7

Stepwise regression for parameters of population grain filling characteristics and yield in different grain stages"

非标准化回归系数
Unstandardized coefficient		 标准误
Standard error		 标准化回归系数
Standardized coefficient		 T值
T-value		 显著水平
Significant level
常数项 1.662 0.722 2.303 0.105
P2 40.279 0.038 1 1 060.712 0.000
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