Crops ›› 2022, Vol. 38 ›› Issue (4): 124-131.doi: 10.16035/j.issn.1001-7283.2022.04.017

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Effects of DPC through Drip Irrigation on Growth and Yield of Cotton

Zhang Te1(), Li Guangwei1, Li Kexin2, Li Xinxin1, Zhao Qiang1()   

  1. 1College of Agriculture, Xinjiang Agricultural University/Cotton Engineering Research Center, Ministry of Education; Urumqi 830052, Xinjiang, China
    2College of Agronomy and Biotechnology, China Agricultural University/Engineering Research Center of Plant Growth Regulator of Ministry of Education, Beijing 100193, China
  • Received:2021-04-23 Revised:2021-08-21 Online:2022-08-15 Published:2022-08-22
  • Contact: Zhao Qiang E-mail:18240968114@163.com;qiangzhao99@163.com

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Abstract:

The goal of the experiment was to see if dropping DPC was feasible and to understand the varied impacts of DPC absorption through cotton leaves and roots on cotton growth and yield. In this experiment, four levels of DPC were set (D1: 262.5g/ha, D2: 525.0g/ha, D3: 1050.0g/ha, D4: 2100.0g/ha). The control was spraying DPC at a rate of 525.0g/ha (CK). Different DPC dosages were examined and analysed for their impact on cotton agronomic characteristics, dry matter accumulation and distribution, yield, and fibre quality. The results showed that plant height slightly decreased with the increase of the DPC dose. In 2019, plant height of D4 treatment was decreased by 13.31%, 12.71% and 5.44% compared with that of D1, D2 and D3 treatments. The plant height and internode length of main stem of D2 treatment were not significantly different from the CK treatment, but the length of some fruit branches was significantly shortened. Under drip treatment, the dry matter ratio of reproductive organs at the initial flowering stage increased with the increase of the dosage of DPC, and D4 treatment increased by 5.67% compared with D1 treatment. Compared with CK treatment, the dry matter accumulation of D2 and D4 treatments decreased slightly during the full bolling stage. In 2019, there was no significant difference in yield components and cotton yield among treatments. In 2020, the seed cotton yield of D3 treatment was increased by 4.90% compared with other DPC treatments. Compared with drip treatment, CK treatment increased the number of single plant knots and seed cotton yield by 0.37 and 484.94kg/ha. All the treatments had no difference on the fiber quality of cotton. Therefore, the DPC drip application in the northern Xinjiang cotton area could effectively control the cotton growth, and the effect was better when the drip application dose was 1050.0g/ha.

Key words: Cotton, Drip irrigation, DPC, Fruit branch length

Table 1

Dates and dosages of DPC through drip irrigation g/hm²"

处理
Treatment		 蕾期
Squaring stage		 初花期
Flowering stage		 初花期
Flowering stage		 盛花期
Full flowering stage		 总量
Total amount
D1 30.0 60.0 60.0 112.5 262.5
D2 60.0 120.0 120.0 225.0 525.0
D3 120.0 240.0 240.0 450.0 1050.0
D4 240.0 480.0 480.0 900.0 2100.0
CK 60.0 120.0 120.0 225.0 525.0

Table 2

Irrigation and fertilizer allocation in cotton field trials in 2019"

滴灌时期
Drip irrigation time		 灌水量
Drip irrigation (m3/hm2)		 氮肥用量
N fertilizer rate (kg/hm2)		 钾肥用量
K fertilizer rate (kg/hm2)		 磷肥用量
P fertilizer rate (kg/hm2)
蕾期Squaring stage 06-10 300.0 0.0 0.0 0.0
06-18 400.0 15.0 4.5 4.5
花铃期
Flowering and boll stage		 06-30 500.0 45.0 9.0 9.0
07-10 600.0 45.0 13.5 13.5
07-21 600.0 45.0 13.5 18.0
08-01 600.0 45.0 18.0 18.0
08-09 600.0 45.0 13.5 13.5
吐絮期Spitting stage 08-19 600.0 45.0 13.5 9.0
08-26 300.0 15.0 4.5 4.5
总量Total amount 4500.0 300.0 90.0 90.0

Table 3

Effects of each treatment on agronomic characters of cotton"

年份
Year		 处理
Treatment		 株高
Plant height (cm)		 茎粗
Stem diameter(mm)		 第1果枝高
Height of the first fruit branch (cm)		 主茎叶片数
Number of leaves		 果枝台数
Number of fruit branches
2019 D1 83.22a 7.83a 13.22a 21.00a 7.67a
D2 82.78ab 8.13a 14.11a 21.72a 8.55a
D3 77.44ab 8.29a 13.33a 20.66a 7.78a
D4 73.44b 7.44a 13.88a 20.55a 7.66a
CK 79.89ab 7.85a 14.00a 22.79a 7.78a
2020 D1 81.46a 7.43a 18.09a 16.40b 10.85a
D2 81.00a 7.65a 16.33ab 17.22ab 11.03a
D3 77.20b 7.64a 15.70b 16.96ab 11.44a
D4 81.07a 7.60a 17.62a 17.03ab 10.70a
CK 83.77a 7.54a 16.77ab 17.66a 11.22a

Fig.1

Effects of each treatment on internode length of cotton main stem Different lowercase letters indicate significant difference at the 0.05 level between different treatments in the same part, the same below"

Fig.2

Effects of each treatment on the length of cotton fruit branch"

Fig.3

Effects of each treatment on the length of cotton fruit node in 2020"

Table 4

Effects of different treatments on cotton root architecture (2020)"

处理
Treatment		 总根长度
Total root length (cm)		 总根表面积
Total root surface area (cm2)		 总根体积
Total root volume (cm3)		 根平均直径
Mean root diameter (mm)		 根尖数
Tips		 连接数
Links		 分叉数
Forks
D1 236.38b 422.06a 229.76a 3.18a 176.48b 393.84b 179.76b
D2 270.18a 388.23a 176.45b 2.85ab 206.48b 498.67a 233.38a
D3 272.57a 406.20a 188.10ab 2.74b 301.41a 529.09a 223.77a
D4 258.90ab 403.54a 192.87ab 3.06ab 190.05b 478.76a 223.86a
CK 235.62b 410.48a 217.37ab 3.14a 182.35b 399.59b 181.06b

Table 5

Effects of each treatment on dry matter accumulation and distribution of cotton (2019)"

时期
Stage		 处理
Treatment		 干物质积累量（g/株）
Dry matter accumulation (g/plant)		 干物质分配比例
Dry matter distribution ratio (%)
总量
Total		 营养器官
Vegetative organ		 生殖器官
Reproductive organ		 营养器官
Vegetative organ		 生殖器官
Reproductive organ
初花期
Flowering		 D1 24.51a 21.04a 3.46a 85.84a 14.15a
D2 21.91a 17.98a 3.93a 82.06a 17.93a
D3 24.40a 19.97a 4.43a 81.84a 18.15a
D4 21.62a 17.34a 4.28a 80.17a 19.82a
CK 24.72a 20.54a 4.18a 83.07a 16.92a
盛花期
Full-flowering		 D1 40.54a 27.14a 13.39a 66.95a 33.04a
D2 38.84a 26.17a 12.66a 67.38a 32.61a
D3 41.44a 27.80a 13.64a 67.07a 32.92a
D4 38.67a 26.39a 12.27a 68.25a 31.74a
CK 37.03a 25.37a 11.66a 68.50a 31.49a
盛铃期
Full-bolling		 D1 68.62b 27.77b 40.85ab 40.47a 59.52a
D2 69.67ab 29.14ab 40.52ab 41.83a 58.16a
D3 66.90b 28.37ab 38.53b 42.40a 57.59a
D4 69.82ab 30.15ab 39.66ab 43.18a 56.81a
CK 75.58a 32.37a 43.21a 42.82a 57.17a

Table 6

Cotton yield and its components under each treatment"

年份
Year		 处理
Treatment		 密度（万株/hm2）
Density
(×104/hm2)		 单株结铃数
Boll number
per plant		 单铃重
Boll weight
(g)		 衣分
Lint percentage
(%)		 籽棉产量
Seed cotton yield
(kg/hm2)		 皮棉产量
Lint cotton yield
(kg/hm2)
2019 D1 25.02a 5.06a 5.16a 41.65a 6516.86a 2716.46a
D2 24.97a 4.85a 5.12a 41.85a 6222.78a 2610.28a
D3 24.29a 5.10a 5.20a 41.85a 6392.26a 2675.95a
D4 24.92a 4.88a 5.23a 41.71a 6308.90a 2632.62a
CK 25.26a 4.91a 5.26a 41.80a 6492.33a 2715.72a
2020 D1 24.88a 4.45ab 5.50a 44.11a 6084.54ab 2683.89abc
D2 24.98a 4.24b 5.34a 44.15a 5654.72b 2496.56c
D3 25.07a 4.40ab 5.55a 44.98a 6123.76ab 2754.47ab
D4 25.31a 4.23b 5.42a 44.67a 5773.47b 2579.01bc
CK 25.05a 4.70a 5.44a 44.46a 6394.06a 2842.80a

Table 7

Effects of treatments on cotton fiber quality"

年份
Year		 处理
Treatment		 纤维长度
Fiber length (mm)		 断裂比强度
Specific strength (CN/tex)		 长度整齐度
Fiber uniformity (%)		 断裂伸长率
Breakage elongation (%)		 马克隆值
MIC
2019 D1 29.08a 27.77a 85.42a 9.43a 4.90a
D2 28.86a 26.95a 85.18ab 9.23a 4.91a
D3 28.77a 27.55a 83.75b 9.31a 4.86a
D4 28.93a 27.00a 84.66ab 9.37a 4.87a
CK 28.87a 27.38a 84.42ab 9.41a 4.92a
2020 D1 28.83a 29.16a 84.19a 10.70a 4.90a
D2 28.38a 28.98a 83.88a 10.58a 5.00a
D3 28.71a 29.37a 84.15a 10.50a 5.00a
D4 28.57a 29.41a 83.94a 10.59a 5.02a
CK 28.62a 29.23a 84.04a 10.59a 4.98a
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