Crops ›› 2023, Vol. 39 ›› Issue (6): 121-126.doi: 10.16035/j.issn.1001-7283.2023.06.017

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Study on Effects of Operation Parameters on Deposition Distribution of UAV Droplets of Sugarcane during Elongating Stage

Zhou Huiwen1(), Yan Haifeng1, Qiu Lihang1, Fan Yegeng1, Zhou Zhongfeng1, Luo Ting1, Deng Yuchi1, Zhang Xiaoqiu1, Liang Yongjian2, Chen Rongfa1(), Wu Jianming1()   

  1. 1Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences/Key Laboratory of Sugarcane Biotechnology and Genetic Improvement, Ministry of Agriculture and Rural Affairs/Key Laboratory of Sugarcane Genetic Improvement of Guangxi, Nanning 530007, Guangxi, China
    2Guangxi South Subtropical Agricultural Sciences Research Institute, Longzhou 532415, Guangxi, China
  • Received:2022-08-25 Revised:2022-09-19 Online:2023-12-15 Published:2023-12-15

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Abstract:

To optimize operation parameters for spraying sugarcane via unmanned aerial vehicle (UAV), we conducted a study on the effects of four-rotor electric UAV spraying sugarcane fog droplets during the elongation stage. The study utilized a five-factor and three-level orthogonal experiment to investigate the impact of chemical regulating agents, operation height, flying speed, spraying volume, and adjuvants on sugarcane canopy deposition and droplet penetration. The results showed that, the factors impacted the amount of droplet deposition followed by the adjuvants, flying speed, spraying volume, operation height, and chemical regulating agent, respectively. The factors impacted the droplet uniformity followed by adjuvants, flying speed, operation height, respectively. The optimal operational parameters were a spraying volume of 30L/ha, an operation height of 4m, a flying speed of 6m/s, and the use of the adjuvant “Jiajiali”. This study can provide a theoretical foundation for the application of UAV during the elongation stage of sugarcane.

Key words: Sugarcane, UAV, Operation parameters, Droplet deposition, Droplet uniformity

Fig.1

Diagram of sugarcane growth and sampling (a) sugarcane growth, (b) sampling diagram"

Table 1

The factors and levels of experiment treatments"

水平
Level		 化学调控剂
Chemical regulating agent		 作业高度
Operation height (m)		 飞行速度
Flying speed (m/s)		 喷施量
Spraying volume (L/hm2)		 助剂
Adjuvant
1 水 3 4 15.0 农博士
2 硼酸+磷酸氢二钾 4 5 22.5 加加力
3 碳长+赤霉素 5 6 30.0 水

Table 2

The design of orthogonal experiment"

试验编号Treatment No. A B C D E 试验编号Treatment No. A B C D E
1 1 1 1 1 1 10 1 1 3 3 2
2 1 2 2 2 2 11 1 2 1 1 3
3 1 3 3 3 3 12 1 3 2 2 1
4 2 1 1 2 2 13 2 1 3 3 3
5 2 2 2 3 3 14 2 2 1 1 1
6 2 3 3 1 1 15 2 3 2 2 2
7 3 1 2 1 2 16 3 1 2 2 1
8 3 2 3 2 3 17 3 2 3 3 2
9 3 3 1 3 1 18 3 3 1 1 3

Table 3

The results of the amount of droplet deposition and RS"

试验编号
Treatment
No.		 雾滴沉积量The amount of droplet deposition (μL/cm2) RS
上部
The upper part		 中部
The middle part		 下部
The lower part		 雾滴平均沉积量
The average amount of droplet deposition
1 0.54±0.04gh 0.48±0.03e 0.32±0.01e 0.44±0.01f 0.95±0.01c
2 0.17±0.01j 0.16±0.01j 0.09±0.01ij 0.14±0.01j 0.87±0.04fg
3 0.80±0.04de 0.57±0.05de 0.35±0.02de 0.57±0.03e 1.03±0.01abc
4 1.89±0.30a 1.31±0.11a 0.81±0.04a 1.34±0.11a 1.08±0.04ab
5 0.75±0.12ef 0.51±0.01d 0.40±0.02d 0.55±0.04e 0.89±0.04defg
6 0.29±0.02j 0.24±0.02i 0.22±0.03fgh 0.25±0.01h 0.97±0.02bcdef
7 0.54±0.02gh 0.45±0.06e 0.24±0.03fg 0.41±0.05f 1.04±0.01abc
8 0.27±0.01ij 0.22±0.01ij 0.19±0.01gh 0.23±0.04hi 1.00±0.01abcde
9 0.62±0.03fg 0.44±0.02ef 0.26±0.03f 0.44±0.02f 0.97±0.04bcdef
10 0.95±0.04cd 0.65±0.05c 0.46±0.01c 0.69±0.08c 0.97±0.04bcdef
11 0.16±0.02j 0.07±0.01k 0.04±0.01j 0.09±0.01j 0.82±0.01g
12 0.29±0.00ij 0.28±0.01hi 0.19±0.02h 0.25±0.01h 0.89±0.03defg
13 0.32±0.02ij 0.20±0.02ij 0.20±0.00gh 0.24±0.01hi 1.03±0.01abc
14 0.43±0.01hi 0.33±0.02gh 0.23±0.02fgh 0.33±0.04g 1.06±0.05abc
15 1.20±0.06b 0.36±0.01fg 0.32±0.02e 0.63±0.07d 1.01±0.08abcd
16 0.24±0.02j 0.22±0.01ij 0.13±0.00i 0.20±0.01i 0.88±0.04efg
17 1.06±0.07bc 0.98±0.06b 0.61±0.08b 0.88±0.12b 1.00±0.04abcde
18 0.59±0.02fgh 0.45±0.03e 0.23±0.01fgh 0.43±0.06f 1.10±0.16a

Table 4

The result of the droplet uniformity"

试验编号
Treatment No.		 标准差
Standard deviation		 雾滴均匀性
Droplet uniformity (%)		 试验编号
Treatment No.		 标准差
Standard deviation		 雾滴均匀性
Droplet uniformity (%)
1 0.095 21.30±1.98gh 10 0.204 29.52±1.51cdefg
2 0.037 26.93±3.73cdefg 11 0.051 55.34±4.61b
3 0.184 32.06±1.39cde 12 0.046 18.26±3.47hi
4 0.449 33.37±7.02cd 13 0.056 23.63±4.01efgh
5 0.148 26.34±6.63defgh 14 0.083 25.41±2.93degh
6 0.032 12.67±3.31i 15 0.407 64.81±2.51a
7 0.126 30.66±3.51cdef 16 0.051 25.93±1.85defgh
8 0.030 13.05±2.59i 17 0.197 22.39±3.64fgh
9 0.148 33.51±3.04cd 18 0.150 35.23±1.94c

Table 5

Variance analysis of the amount of droplet deposition and droplet uniformity"

来源
Source		 df 雾滴沉积量The amount of droplet deposition 雾滴均匀性Droplet uniformity
均方
Mean square		 F检验
F test		 显著性水平
Sig.		 均方
Mean square		 F检验
F test		 显著性水平
Sig.
校正模型Calibration model 17 0.28 354.73 0 0.05 25.37 0
截距Intercede 1 10.96 14 055.49 0 4.69 2352.93 0
T 17 0.28 354.73 0 0.05 25.37 0
误差Error 36 0.001 0.002
总计Total 54

Table 6

Variance ratio of droplet deposition"

因素
Factor		 方差占比
Variance ratio (%)		 因素
Factor		 方差占比
Variance ratio (%)		 因素
Factor		 方差占比
Variance ratio (%)		 因素
Factor		 方差占比
Variance ratio (%)
A 6.20 A 1.92 A 0.44 A 20.75
B 3.38 B 6.07 B 10.09 B NA
C 22.74 C 37.06 C NA C 13.57
D 13.60 D NA D 4.16 D 15.24
E 31.97 E 20.09 E 34.07 E 12.90
E:D 31.45 E:C 48.29 E:B 29.23

Table 7

Variance ratio of droplet uniformity"

因素
Factor		 方差占比
Variance ratio (%)		 因素
Factor		 方差占比
Variance ratio (%)		 因素
Factor		 方差占比
Variance ratio (%)		 因素
Factor		 方差占比
Variance ratio (%)
A 7.76 A 3.49 A 3.65 A 11.86
B 9.25 B 12.33 B 16.91 B 4.27
C 14.24 C 25.61 C NA C 9.79
D 7.71 D 2.80 D 2.04 D 11.07
E 34.10 E 26.40 E 38.93 E 24.98
E:D 17.68 E:C 22.14 E:B 19.91
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