Crops ›› 2020, Vol. 36 ›› Issue (5): 204-208.doi: 10.16035/j.issn.1001-7283.2020.05.031

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Effects of Post-Emergence Herbicide Spraying at Different Stages on Weed Control, and Yield and Quality of Winter Rapeseed

Wang Furong(), Zhang Jianxue, Guo Minjiang, Zhang Yahong, Fan Tiping, Wang Yahong, Zhang Yan, Pei Guoping, Lei Jianming()   

  1. Tianshui Institute of Agricultural Sciences, Tianshui 741001, Gansu, China
  • Received:2020-03-02 Revised:2020-05-22 Online:2020-10-15 Published:2020-10-12
  • Contact: Lei Jianming E-mail:wangfurong8011@163.com;jianminlei@163.com

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Abstract:

In order to study the effects of different application stages of post-emergence herbicides on weeds control, yield and quality of winter rapeseed in north China, local winter rapeseed Tianyou 2266 (Brassica napus L.) and Tianyou H614 (Brassia campestris L.) were used as test materials. The safe post-emergence herbicide (haloxyfop-r-methyl) was selected before spraying at four different time points in the field trials from 2018 to 2019. The results showed that the spraying of herbicides after seedling stage at different times of post winter season, reduced the total number of weeds in the field of winter rapeseed (B.napus L.) by 57.54%-92.56% compared with the control, and the total fresh weight of weeds decreased by 75.40%-97.48%. Moreover, the seed yield under second stage treatment increased by 354.50kg/ha compared with control. Meanwhile, the weed control efficiency of B.campestris L. was 55.91%-92.02% and the control effect of fresh weight was 37.17%-97.46%, and the yield increased by 2.29%-16.77%. Therefore, it is recommended that post-emergence herbicide should be sprayed in second time point, which can significantly control weeds and increase seed yield of winter rapeseed.

Key words: Winter rape, Herbicides, Spraying stage, Weeds, Yield, Quality

Table 1

Effects of different application dates of herbicide on the quantity and fresh weight of weeds"

处理
Treatment		 杂草株数Number of weed 杂草鲜重
Fresh weight of weed (g)		 株防效
Plant control effect (%)		 鲜重防效
Fresh weight control effect (%)
禾本科Gramineous 阔叶类Broad-leaved 合计Total
GCK 22.67a 69.89a 92.56a 109.33a - -
GT1 0.00b 24.89d 24.89d 26.11b 73.11b 76.12c
GT2 0.33b 14.67e 15.00e 2.78d 83.79a 97.48a
GT3 0.00b 27.78c 27.78c 15.89c 69.99c 85.47b
GT4 1.33b 45.78b 47.11b 26.89b 49.10d 75.40d
BCK 26.33a 37.67a 64.00a 437.89a - -
BT1 0.00b 27.00b 27.00b 47.44d 57.81c 89.17b
BT2 0.00b 5.11d 5.11d 11.11e 92.02a 97.46a
BT3 0.00b 14.00c 14.00c 65.78c 78.13b 84.98c
BT4 2.00b 26.22b 28.22b 275.11b 55.91d 37.17d

Table 2

Effects of different post-emergence herbicide spraying stages on winter rapeseed plant growth"

处理
Treatment		 株高
Plant height (cm)		 分枝部位
Branch position (cm)		 一次分枝数
Primary branches		 主序长度
Length of terminal raceme (cm)		 主序角果数
Pods of terminal raceme		 角果长度
Pod length (cm)
GCK 136.13b 62.07ab 6.33b 54.60a 62.27a 7.36a
GT1 137.80b 46.60b 8.60a 53.07a 63.07a 6.62c
GT2 158.83a 72.02a 7.70ab 51.53a 58.00a 7.26a
GT3 152.07a 60.13ab 7.47ab 60.53a 66.67a 6.73bc
GT4 159.60a 66.53a 8.27ab 59.33a 66.33a 7.16ab
BCK 165.93c 76.60b 6.53a 51.00b 37.33b 5.43a
BT1 175.62ab 66.48c 7.67a 60.42a 60.72a 5.66a
BT2 180.13a 74.20b 7.87a 54.60ab 51.73a 5.72a
BT3 178.28ab 84.02a 7.03a 51.87b 53.47a 5.63a
BT4 171.67bc 77.53b 6.93a 50.53b 54.33a 5.81a

Table 3

Comparison of rapeseed yield and its factors of winter rapeseed at different herbicide application stages"

处理
Treatment		 单株角果数
Pods per plant		 每角粒数
Seeds per pod		 千粒重
1000-seed weight (g)		 单株产量
Yield per plant (g)		 产量
Yield (kg/hm2)
GCK 110.15b 25.37b 3.49c 9.98c 9 545.02ab
GT1 194.27a 24.94b 3.54c 20.83b 9 391.58ab
GT2 178.67a 29.20a 4.62a 24.09ab 9 899.52a
GT3 172.72a 26.26ab 3.81c 21.12ab 8 809.57b
GT4 166.78a 28.09ab 4.20b 24.91a 8 703.75b
BCK 127.40c 22.84a 3.17b 10.11c 3 232.61b
BT1 150.08bc 23.89a 3.40ab 14.61b 3 774.83a
BT2 248.47a 27.20a 3.41ab 20.18a 3 688.91a
BT3 178.24b 25.89a 3.58a 18.41a 3 389.64b
BT4 137.17c 24.23a 3.51a 12.94bc 3 306.68b

Table 4

Effects of different post-emergence herbicide application stages on winter rapeseed grain quality"

处理
Treatment		 油酸
Oleic acid (%)		 亚油酸
Linoleic acid (%)		 芥酸
Erucic acid (%)		 硫苷
Glucosinolate (μmol/g)		 含油量
Oil content (%)		 蛋白质
Protein (%)
GCK 21.95a 17.92a 32.52b 101.61ab 38.24b 26.87ab
GT1 21.59ab 17.47ab 32.80b 104.64ab 39.49b 26.94a
GT2 18.91b 16.72bc 36.04a 97.10b 43.53a 24.88d
GT3 21.64ab 15.80d 36.01a 108.92a 42.44a 26.01bc
GT4 23.55a 16.48cd 33.73ab 107.35a 43.80a 25.34cd
BCK 20.03bc 16.62a 38.94bc 95.60a 42.66ab 26.18b
BT1 18.83c 15.21b 41.90a 88.93b 44.15a 26.02b
BT2 23.06a 16.55a 37.18c 95.75a 41.99b 26.60b
BT3 22.41ab 16.69a 37.42c 90.48b 40.93b 27.89a
BT4 22.22ab 15.09b 40.24ab 90.06b 42.77ab 26.17b
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