Crops ›› 2019, Vol. 35 ›› Issue (6): 66-70.doi: 10.16035/j.issn.1001-7283.2019.06.010

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Correlation Analysis between Main Agronomic Traits and Density in Mechanical Harvest Cotton

Wang Yan,Wang Shulin,Zhang Qian,Feng Guoyi,Lei Xiaopeng,Liang Qinglong,Qi Hong   

  1. Cotton Research Institute, Hebei Academy of Agriculture and Forestry Sciences/Key Laboratory of Cotton Biology and Genetic Breeding in Huanghuaihai Semi-Arid Region, Ministry of Agriculture and Rural Affairs/Hebei Branch of National Cotton Improvement Center, Shijiazhuang 050051, Hebei, China
  • Received:2019-04-01 Revised:2019-09-26 Online:2019-12-15 Published:2019-12-11
  • Contact: Hong Qi

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Abstract:

To study the effects of density on the agronomic traits of mechanical harvest cotton, and to breed the plant variety suitable for mechanical harvest by increasing density. Field experiments with K836 were conducted with three planting densities (3×10 4, 6×10 4 and 9×10 4 plants/hm 2) to study the effects of density and its correlation analysis. The results showed that the plant height, the length of the fruit branch, the length of the first node in the fruit branch, the nodes per fruit branch, the fruit branches per plant and the dry weight per plant decreased with the increase of density. Compared with low density (3×10 4 plants/hm 2), high density (9×10 4 plants/hm 2) had lower single boll weight, higher lint percentage, lower bolls per plant and higher total bolls, but there was no significant effect on yield. The plant height, height of the first fruit branch, the node of the first fruit branch, the length of the fruit branch, the length of the first node of the fruit branch, the nodes per fruit branch, the branch angle, the fruit branches per plant were positively correlated with bolls per plant and dry weight per plant, negatively correlated with single boll weight and yield. Therefore,increasing the density could reduce the plant height, shorten the fruit branch and make the plant more compact. The plant density could be adjusted suitable for mechanical harvesting. The density of 9×10 4 plants/hm 2 in southern Hebei meets the requirements of mechanical harvesting.

Key words: Cotton, Planting density, Plant type, Mechanical harvest traits

Table 1

Effects of density on mechanical harvest agronomic traits of cotton"

密度
(×104株/hm2)
Density
(×104plants/hm2)		 株高
Plant
height
(cm)		 第一果枝高度
Height of the first fruit branch (cm)		 第一果枝节位
Node of the first fruit branch		 果枝长度
Length of the fruit branch
(cm)		 果枝第一节位长度
Length of the first node of the fruit branch(cm)		 果枝节数 Nodes
per fruit
branch		 果枝夹角
Fruit
branch
angle(°)		 单株果枝数
Fruit branches per plant		 单株
干物质量
Dry weight
per plant (g)
3.00 102.2a 26.7b 7.1a 47.3a 15.0a 6.3a 65.0a 13.4a 149.02a
6.00 96.8ab 25.6b 6.7a 32.9b 12.4b 5.4a 61.3a 12.1b 124.87ab
9.00 89.5b 29.5a 6.8a 28.9b 12.1b 3.9b 60.1a 10.8c 90.92b

Table 2

Effects of density on unginned cotton yield and yield components"

密度(×104株/hm2)
Density (×104plants/hm2)		 单铃重(g)
Single boll weight		 单株铃数
Bolls per plant		 总铃数(×104/hm2)
Total bolls		 衣分(%)
Lint percentage		 子棉产量(kg/hm2)
Unginned cotton yield
3.00 6.0a 18.2a 56.0c 37.9b 2 930.6a
6.00 5.9a 11.0b 67.5b 37.7b 3 336.3a
9.00 5.6b 9.5b 84.5a 38.4a 3 281.4a

Table 3

Variation coefficient of mechanical harvest agronomic traits of cotton"

项目
Item		 株高
Plant
height
(cm)		 第一果枝高度
Height of the first fruit
branch (cm)		 果枝长度Length of the fruit branch
(cm)		 果枝第一节位长度
Length of the first node
of the fruit branch
(cm)		 果枝节数
Nodes per
fruit branch		 单株果枝数
Fruit branches
per plant		 单株干物质量
Dry weight
per plant (g)		 单铃重
Single boll weight (g)		 单株铃数
Bolls
per plant		 衣分(%)
Lint percentage
均值Mean 96.2 27.3 36.5 13.1 5.2 12.1 121.6 5.8 12.9 38.0
标准差
Standard deviation		 6.4 2.0 9.7 1.6 1.2 1.3 29.2 0.2 4.7 0.4
变异系数(%)
Variable coefficient		 6.6 7.5 26.6 12.2 23.3 10.7 24.0 2.8 36.2 1.1

Table 4

Correlation matrix of cotton traits"

性状Trait X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 X12 Y
X1 -1
X2 -0.352 -1
X3 -0.042 -0.108 -1
X4 -0.769* -0.211 -0.649 -1
X5 -0.405 -0.081 -0.843 -0.881** 1
X6 -0.723* -0.332 -0.512 -0.877** -0.787* -1
X7 -0.326 -0.233 -0.646 -0.577 -0.576 -0.450 -1
X8 -0.907** -0.292 -0.306 -0.864** -0.601 -0.877** -0.436 -1
X9 -0.600 -0.188 -0.599 -0.797* -0.710* -0.915** -0.521 -0.855** -1
X10 -0.118 -0.149 -0.171 -0.121 -0.148 -0.442 -0.329 -0.317 -0.604 -1
X11 -0.679* -0.178 -0.525 -0.851** -0.721 -0.698* -0.560 -0.849** -0.726* -0.114 -1
X12 -0.261 -0.501 -0.136 -0.236 -0.219 -0.620 -0.232 -0.440 -0.648 -0.839** -0.197 -1
Y -0.737* -0.046 -0.343 -0.795* -0.566 -0.577 -0.175 -0.733* -0.543 -0.151 -0.668* -0.174 1
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