Abstract
Small unmanned aerial vehicle (UAV), a timely and effective pesticide sprayer, can be used to spray pesticide in a high efficiency without harming the crop, and is especially suitable for spraying for small farms and hills in Asian countries. In recent years, it has been chosen as a key and new technique for pesticide application. This paper studied the impact of UAV (UAV N-3) spraying parameters (different working height and different spraying concentrations) on the deposition of droplets on the wheat canopy and the prevention of powdery mildew. Water sensitive paper was used as the sampler to collect the pesticide droplets and image processing software Deposit Scan was used to compute the coverage rate of droplets on the wheat top layer to acquire the proportional distribution of droplets on the wheat lower layer. The experimental results showed the impact of spraying height on the distribution of droplets on the wheat upper layer was quite significant, when the spraying height was 5.0 m and the spraying speed was 4 m/s, the coverage rate of droplets on the wheat lower layer was the largest, as it was 45.6% of that on the upper layer, the droplets distribution was the most uniform, and the coefficient of variation was 33.13%. 450 g/hm2 (dosage registered) of triadimefon SC (44%) was sprayed by the UAV, the control efficiency reached 55.1% after applying which was better than 20% and 40% of dosage decreased for each hectare, and the applying effect (35.6%) of 20% dosage decreased for each hectare had no significant difference from the applying effect (34.6%) applied by a knapsack-type electric sprayer. At 10 d after applying, the prevention effect realized by UAV was lower than that realized by a knapsack-type electric sprayer, and it may be correlated to the meteorological condition and water amount in the pesticide sprayed. Thus, when UAV spraying was chosen to prevent wheat powdery mildew under a serious disease situation, an auxiliary agent for spraying could be added to prolong the retention of pesticide on the plant surface to extend the pesticide effect. This study can provide a reference for the optimized design, performance upgrade and reasonable application of small UAV sprayers. Keywords: unmanned aerial vehicle (UAV), spraying pesticide, parameters optimization, fungicide deposition, wheat powdery mildew, control effect DOI: 10.25165/j.ijabe.20181102.3157 Citation: Qin W C, Xue X Y, Zhang S M, Gu W, Wang B K. Droplet deposition and efficiency of fungicides sprayed with small UAV against wheat powdery mildew. Int J Agric & Biol Eng, 2018; 11(2): 27–32.
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Claims 7
Claim · model-written summary
Spraying height significantly affected droplet distribution on the wheat upper canopy.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- spraying heighte0
- Outcome
- distribution of droplets on the wheat upper layere0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the impact of spraying height on the distribution of droplets on the wheat upper layer was quite significant”
Claim · model-written summary
At 5.0 m spraying height and 4 m/s speed, lower canopy coverage was maximal at 45.6% of upper canopy coverage.
- Taxon
- wheatTriticum aestivume0
- Treatment
- spraying height was 5.0 m and the spraying speed was 4 m/se0
- Outcome
- coverage rate of droplets on the wheat lower layere0
- Direction
- largeste0
- Value
- 45.6%e0
- Comparator
- upper layere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when the spraying height was 5.0 m and the spraying speed was 4 m/s, the coverage rate of droplets on the wheat lower layer was the largest, as it was 45.6% of that on the upper layer”
Claim · model-written summary
At those spraying settings droplet distribution was most uniform, with a 33.13% coefficient of variation.
- Taxon
- wheatTriticum aestivume0
- Treatment
- spraying height was 5.0 m and the spraying speed was 4 m/se0
- Outcome
- coefficient of variatione0
- Direction
- most uniforme0
- Value
- 33.13%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when the spraying height was 5.0 m and the spraying speed was 4 m/s, the coverage rate of droplets on the wheat lower layer was the largest, as it was 45.6% of that on the upper layer, the droplets distribution was the most uniform, and the coefficient of variation was 33.13%.”
Claim · model-written summary
UAV application of registered triadimefon dose achieved 55.1% powdery mildew control.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 450 g/hm2 (dosage registered) of triadimefon SC (44%)e0
- Interactor
- powdery mildewt0pathogen
- Outcome
- control efficiencye0
- Direction
- bettere0
- Value
- 55.1%e0
- Comparator
- 20% and 40% of dosage decreased for each hectaree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat powdery mildew”
e0“450 g/hm2 (dosage registered) of triadimefon SC (44%) was sprayed by the UAV, the control efficiency reached 55.1% after applying which was better than 20% and 40% of dosage decreased for each hectare”
Claim · model-written summary
A 20% reduced UAV dose had 35.6% control, without a significant difference from the knapsack sprayer at 34.6%.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 20% dosage decreased for each hectaree0
- Interactor
- powdery mildewt0pathogen
- Outcome
- applying effecte0
- Direction
- no significant differencee0
- Value
- 35.6%e0
- Qualifier
- 34.6%e0
- Comparator
- knapsack-type electric sprayere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat powdery mildew”
e0“the applying effect (35.6%) of 20% dosage decreased for each hectare had no significant difference from the applying effect (34.6%) applied by a knapsack-type electric sprayer.”
Claim · model-written summary
At 10 days, UAV application had lower disease prevention than knapsack spraying.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- UAVe0
- Interactor
- powdery mildewt0pathogen
- Outcome
- prevention effecte0
- Direction
- lowere0
- Qualifier
- 10 d after applyinge0
- Comparator
- knapsack-type electric sprayere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat powdery mildew”
e0“At 10 d after applying, the prevention effect realized by UAV was lower than that realized by a knapsack-type electric sprayer”
Claim · model-written summary
For severe wheat powdery mildew, the authors suggest a spray auxiliary agent to prolong pesticide retention.
- Taxon
- wheatTriticum aestivumt0
- Interactor
- powdery mildewe0pathogen
- Outcome
- an auxiliary agent for spraying could be addede0
- Qualifier
- under a serious disease situatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat powdery mildew”
e0“when UAV spraying was chosen to prevent wheat powdery mildew under a serious disease situation, an auxiliary agent for spraying could be added to prolong the retention of pesticide on the plant surface to extend the pesticide effect.”
The same questions in other papers
triadimefon · control · Triticum aestivum (wheat)Results agree
6 papers in the same direction as this paper
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.