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Acta Agronomica Sinica ›› 2023, Vol. 49 ›› Issue (2): 552-560.doi: 10.3724/SP.J.1006.2023.24034

• RESEARCH NOTES • Previous Articles     Next Articles

Screening of different dropping formulations about mepiquat chloride and their effects on cotton growth and development

LOU Shan-Wei1,2(), GAO Fei3, WANG Chong3, TIAN Xiao-Li1, DU Ming-Wei1, DUAN Liu-Sheng1,4,*()   

  1. 1College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
    2China National Cotton R&D Center, Urumqi 830091, Xinjiang, China
    3Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agricultural Sciences, Beijing 100081, China
    4College of Plant Science and Technology Beijing University of Agriculture, Beijing 102206, China
  • Received:2022-02-02 Accepted:2022-06-07 Online:2022-07-08 Published:2022-07-08
  • Contact: DUAN Liu-Sheng E-mail:wei.lou@163.com;duanlsh@cau.edu.cn
  • Supported by:
    Independent Cultivation Project of Xinjiang Academy of Agricultural Sciences(nkyzztd-002);Xinjiang Central Guiding the Local Science and Technology Development

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Abstract:

The drop method of mepiquat chloride is an important research field in cotton. In order to explore the new sustained-release dropping formulation and its effect on cotton regulation, the following experiments were carried out. The dropping formulations were screened by pot cultivation with five kinds (H1, H2, H3, H4, and H5) of dripping application form, and common mepiquat chloride (S) and water as the control (CK). To investigate the screening of different dosage forms and the effect of regulating cotton agronomic characters and yield, two concentration levels of low and high (90.0 g hm-2 and 180.0 g hm-2) were set in the field. The results showed that under pot conditions, the uniformity of five different formulations of mepiquat chloride was basically above 66%, and the seedling growth rate greatly affected by the variety mostly between 40% and 70%. Plant height was reduced by 32%-41% and 24%-35%, respectively, and there was significantly different in plant height after 25 days. Under field conditions, treatment S had the best height control effect, CK increased the fastest, and all treatments had better height control effects at high concentrations of sustained-release mepiquat chloride and were significantly different from CK. At low concentrations, plant height of H5 was 61.0 cm. The effect was similar to S and had no significant difference, and other treatments had no significant difference with CK. Cotton plant width, stem diameter, the number of leaves in main stem, and the number of fruit branches were 26.0-35.0 cm, 9.5-11.5 mm, 13-14 pieces, and 7-8 sets, respectively, which had no significant difference with CK and S. The new type of sustained-release mepiquat chloride could promote bud initiation and increase boll numbers. By June 28 (peak flowering stage), the total number of flowers and bolls in two concentration levels of H1 were 12.7 and 11.5 per plant, respectively, which were 2.0 and 0.8 higher than that of S. The final yield of all treatments at low concentration was higher than that of high concentration. And the yield of H5 was the highest (7267.26 kg hm-2), which was 40% and 33% higher than CK and S, respectively, followed by H1. In conclusion, dropping formulations of H1 and H5 control plant height, shape plant type and yield performance was better, and further related experimental research can be carried out.

Key words: cotton, sustained release mepiquat, drip application, regulation, agronomic characters

Table 1

Design of experiment"

处理
Treatment		 6月4日第1次灌根
Frist time root watering on June 4
(g hm-2)		 6月28日第二次灌根
Second time root watering on June 28
(g hm-2)		 总量
Total
(g hm-2)
低浓度 LC 高浓度 HC 低浓度 LC 高浓度 HC 低浓度 LC 高浓度 HC
H1 30.0 60.0 60.0 120.0 90.0 180.0
H2 30.0 60.0 60.0 120.0 90.0 180.0
H3 30.0 60.0 60.0 120.0 90.0 180.0
H4 30.0 60.0 60.0 120.0 90.0 180.0
H5 30.0 60.0 60.0 120.0 90.0 180.0
S 30.0 60.0 90.0
CK — — —

Table 2

Effects of different dosage forms of Mepiquat on seedling uniformity and growth of potted cotton (%)"

处理
Treatment		 苗整齐率Neat rate of cotton seedling 壮苗率Strong seedling rate
新陆早78号
Xinluzao 78		 鲁棉研22号
Lumianyan 22		 新陆早78号
Xinluzao 78		 鲁棉研22号
Lumianyan 22
H1 66.7 100.0 50.0 66.7
H2 100.0 66.7 16.7 66.7
H3 66.7 66.7 50.0 83.3
H4 50.0 66.7 50.0 33.3
H5 100.0 100.0 33.3 100.0
S 66.7 66.7 66.7 66.7
CK 66.7 100.0 33.3 83.3

Fig. 1

Changes of plant height of different cotton varieties Treatments are the same as those given in Table 1."

Fig. 2

Cotton morphology in different batches of potted plants Treatments are the same as those given in Table 1."

Fig. 3

Plant height under field treatment with different concentrations Treatments are the same as those given in Table 1."

Fig. 4

Plant height of field treatment with different concentrations Values followed by different lowercase letters are significantly different at the 0.05 probability level. Treatments are the same as those given in Table 1."

Table 3

Main agronomic characters of cotton under different treatments"

处理
Treatment		 株宽
Plant height (cm)		 茎粗
Stem diameter (mm)		 主茎叶片数
No. of leaf		 果枝台数
No. of fruit branch		 果枝始节高
Height of first branch (cm)
低浓度
LC		 H1 33.0 a 10.9 a 14.0 a 7.3 a 25.3 a
H2 34.3 a 10.2 a 14.0 a 8.0 a 26.5 a
H3 32.8 a 10.5 a 13.2 a 8.0 a 27.5 a
H4 33.2 a 9.8 a 14.0 a 8.3 a 22.8 a
H5 29.5 a 10.1 a 13.5 a 7.7 a 23.3 a
S 33.8 a 10.4 a 13.3 a 8.0 a 21.2 a
CK 31.3 a 10.1 a 13.0 a 7.2 a 24.2 a
高浓度
HC		 H1 26.0 a 11.0 a 13.0 a 6.8 a 25.5 a
H2 23.0 a 10.6 a 12.7 a 7.0 a 22.2 a
H3 27.2 a 10.8 a 13.8 a 7.8 a 21.0 a
H4 28.2 a 10.1 a 13.5 a 7.7 a 21.8 a
H5 32.3 a 10.5 a 13.3 a 7.8 a 19.0 a
S 33.8 a 10.4 a 13.3 a 8.0 a 21.2 a
CK 31.3 a 10.1 a 13.0 a 7.2 a 24.2 a
DPC剂量之间
Between DPC doses		 H1 ns ns ns ns ns
H2 * ns ns ns ns
H3 ns ns ns ns *
H4 ns ns ns ns ns
H5 * ns ns ns *

Fig. 5

Changes of bud and boll flowers under different treatments Treatments are the same as those given in Table 1. Values followed by different lowercase letters are significantly different at the 0.05 probability level."

Table 4

Effects of different treatments on cotton constituent factors"

处理
Treatment		 收获株数
Harvest plant of land
(×104 plant hm-2)		 单株结铃数
Boll No. per plant		 单铃重
Boll weight (g)		 籽棉产量
Seed cotton yield (kg hm-2)
低浓度
LC		 H1 22.20 a 6.0 a 5.21 a 6939.72 ab
H2 20.70 a 5.7 a 5.29 a 6205.17 ab
H3 22.80 a 5.2 a 5.18 a 6102.04 ab
H4 17.40 a 5.7 a 5.27 a 5196.22 b
H5 23.10 a 6.0 a 5.24 a 7267.26 a
S 21.20 a 5.7 a 5.22 a 6266.96 ab
CK 23.40 a 4.5 a 5.18 a 5451.03 b
高浓度
HC		 H1 22.50 a 4.8 a 5.25 a 5705.75 a
H2 23.70 a 4.3 a 5.21 a 5354.09 a
H3 21.90 a 4.3 a 5.29 a 5020.21 a
H4 21.75 a 4.8 a 5.25 a 5515.56 a
H5 24.00 a 5.0 a 5.20 a 6244.00 a
S 21.20 a 5.7 a 5.22 a 6266.96 a
CK 23.40 a 4.5 a 5.18 a 5451.03 a
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