Crops ›› 2017, Vol. 33 ›› Issue (3): 127-131.doi: 10.16035/j.issn.1001-7283.2017.03.023

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Effects of Planting Density on Agronomic Traits, Economic Traits and Yield of Soybean in North of Shanxi Province

Zhang Xuli,Xing Baolong,Wang Guimei,Yin Lili   

  1. Cold Region Crop Research Institute,Shanxi Academy of Agricuitural Sciences,Datong 037008,Shanxi,China
  • Received:2017-02-28 Revised:2017-03-30 Online:2017-06-15 Published:2018-08-26
  • Contact: Baolong Xing

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Abstract:

In order to probe into the effects of different planting density on traits and yield of soybean, the early-maturing soybean variety of Jindou 43 was planted in northern part of Shanxi province. Six different planting densities were set up to study the suitable planting density. The results showed that with the increase of density, the height of soybean showed a trend of increase first and then decrease. The stem diameter, number of nodes, branch number, grain number per plant, pods per plant and grain weight per plant showed a trend of decrease as the density increased. 100-grain weight showed a trend decrease first and then increase, the yield showed a trend of increase and then decline as the density increased. The suitable planting density was 210 000~270 000plants/hm 2. Correlation and path analysis showed that planting density was an important measure to optimize the community structure of soybeans. Keeping reasonable planting density and increasing grain weight per plant and branch number could be beneficial to improve the outputs of soybeans. The second-order polynomial model y=b0+b1x+b2x 2 obtained by SPSS curvilinear regression was assayed to analyze the relationship between the planting density and outputs. The equation of this test was y=-5762.478+791.819x-16.147x 2. The theoretical calculation of planting density was 245 191plants/hm 2 and the yield was 4 046.61kg/hm 2. This study had provided the theoretical basis for high production of soybeans in northern part of Shanxi province.

Key words: Soybean, Planting density, Agronomic trait, Economic traits, Yield

Table 1

The effects of different planting densities on agronomic traits in Jindou 43"

密度Density (万株/hm2) 株高Plant height (cm) 分枝数Branch number (个) 主茎节数Number of nodes (节) 茎粗Stem diameter (cm)
18 66.96d 2.01a 16.75a 0.71a
21 69.29d 1.94a 16.28a 0.68ab
24 73.43c 1.70b 15.35b 0.66bc
27 78.68b 1.61b 14.72c 0.61cd
30 84.01a 0.99c 14.55c 0.57d
33 80.52b 0.50d 14.51c 0.52e

Table 2

The effects of different planting densities on economic traits and yield in Jindou 43"

密度(万株/hm2)Density 单株荚数(个)
Pods per plant		 单株粒数(粒)
Grain number per plant		 单株粒重(g)
Grain weight per plant		 百粒重(g)
100-grain weight		 产量(kg/hm2)
Yield
18 54.60a 131.26a 19.04a 17.86a 3 253.21ab
21 52.55a 118.83ab 17.98ab 17.56a 3 703.00ab
24 41.31b 197.30bc 16.59ab 17.36a 4 046.61a
27 37.99b 184.31cd 14.47bc 17.27a 3 834.64a
30 27.98c 164.49de 11.43cd 17.32a 3 359.52ab
33 20.67c 147.96e 18.35d 17.40a 2 836.70b

Table 3

The correlation analysis of soybean yield with agronomic traits and economic traits under different planting densities"

性状
Traits		 密度X1
Density		 株高X2
Plant
height		 主茎节数X3
Number
of nodes		 分枝数X4
Branch number		 茎粗X5
Stem
diameter		 单株荚数X6
Pods per
plant		 单株粒数X7
Grain number per plant		 单株粒重X8
Grain weight per plant		 百粒重X9
100-grain weight		 产量Y
Yield
X1 1
X2 0.910** 1
X3 -0.907** -0.870** 1
X4 -0.941** -0.787** 0.776** 1
X5 -0.934** -0.846** 0.824** 0.915** 1
X6 -0.930** -0.783** 0.906** 0.931** 0.880** 1
X7 -0.919** -0.757** 0.914** 0.905** 0.855** 0.989** 1
X8 -0.895** -0.702** 0.838** 0.924** 0.831** 0.958** 0.973** 1
X9 -0.330 -0.351 0.367 0.178 0.175 0.276 0.269 0.252 1.000
Y -0.291 -0.028 0.199 0.514* 0.288 0.485* 0.517* 0.652** -0.138 1

Table 4

The path analysis of density with soybean yield and yield components"

自变量
Independent variable		 与y的简单
相关系数
Simple correlation coefficient with y		 通径系数
(直接作用)
Path coefficient
(direct effect)		 间接通径系数(间接作用)
Indirect path coefficients (indirect effect)
密度
Density		 分枝数
Branch number		 单株荚数
Pods per plant		 单株粒重
Grain weight per plant
密度Density -0.291 1.808 - -0.948 0.606 -1.757
分枝数Branch number 0.514 1.007 -1.701 - -0.607 1.815
单株荚数Pods per plant 0.485 -0.652 -1.681 0.939 - 1.879
单株粒重Grain weight per plant 0.652 1.965 -1.618 0.930 -0.625 -

Fig.1

The scatterplot analysis of soybean yield on planting density"

Table 5

Model summary and parameter estimates of planting density and soybean yield"

因变量
Dependent variable		 方程Equation 模型汇总Model summary 参数估计值Estimate parameter
R2 F df1 df2 Sig 常数Constant b1 b2
产量Yield 线性Linerity 0.162 0.776 1 14 0.428 4 314.104 -31.666
对数Logarithm 0.104 0.462 1 14 0.534 5 522.661 -626.851
倒数Reciprocal 0.057 0.242 1 14 0.649 3 049.076 11 157.079
二次Quadratic 0.973 54.496 2 13 0.004 -5 762.478 791.819 -16.147
复合Compiex 0.182 0.888 1 14 0.399 4 472.188 0.990
幂Power 0.119 0.542 1 14 0.503 6 568.800 -0.197
S 0.069 0.297 1 14 0.615 8.008 3.602
增长Growth 0.182 0.888 1 14 0.399 8.406 -0.010
指数Index 0.182 0.888 1 14 0.399 4 472.188 -0.010
对数Logarithm 0.182 0.888 1 14 0.399 0.000 1.010
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