Spray drift has always been a focus research area in the field of unmanned aerial vehicle (UAV) application. Under fixed premises UAV operating parameters, such as height, speed and spraying liquid, droplet is mainly affected by meteorological conditions. In this research, spray deposition tests were conducted using QuanFeng120 pineapple under various different The experimental results showed that with changes height wind speed, start position in-swath changed 4 m extreme situation....

Multi-rotor unmanned aerial vehicle (UAV) is a new chemical application tool for tall stalk tropical crop Areca catechu, which could improve deposit performance, reduce operator healthy risk, and increase spraying efficiency. In this work, experiment was carried out in two A. catechu fields with leaf area index (LAI) values, different operational parameters were set. Spray quality, spray drift, ground loss studied evaluated. The results showed that the larger LAI of lesser coverage...

Abstract It is difficult for the handheld/backpack or ground machinery to spray pineapple plant fields because profile relatively inaccessible. In this situation, unmanned aerial vehicles (UAVs) are a good choice easy access and no physical damage crops. Aerial quality optimum application parameter settings can be influenced by many factors such as UAV type, operating parameters, meteorological conditions, crop growth period, pest species. The objective of study was investigate effects...

The aerial spraying of pesticides by plant protection unmanned vehicles (UAV) is a process in which the spray droplet deposition on target sites occurs under influence downwash wind field. field most important factor affecting distribution characteristics an spray. To understand mechanism field, tests were conducted at different flight heights using DJI UAV, and three-dimensional direction (X-directional wind, Y-crosswind, Z-vertical wind) was measured speed measurement system for UAV....

Natural rubber is an essential raw material for industrial products and plays important role in social development. A variety of diseases can affect the growth trees, reducing production quality natural rubber. Therefore, it great significance to automatically identify leaf disease. However, practice, different have complex morphological characteristics spots symptoms at stages scales, there are subtle interclass differences large intraclass variation between diseases. To tackle these...

Abstract Abscisic acid (ABA) plays a vital role in coordinating physiological processes during fresh fruit ripening. Binding of ABA to receptors facilitates the interaction and inhibition type 2C phosphatase (PP2C) co-receptors. However, exact mechanism PP2C ripening is unclear. In this study, we determined tomato co-receptor SlPP2C3, negative regulator signaling SlPP2C3 selectively interacted with monomeric SlSnRK2.8 kinase both yeast tobacco epidermal cells. Expression was ABA-inducible,...

Unmanned aerial vehicles (UAVs) have been widely used in plant protection, and the mechanism of droplet deposition drift while spraying with 3WQF120-12 produced by Quanfeng Aviation, a representative model single-rotor protection UAVs China, still requires more research. This study combination computational fluid dynamics (CFD) wind tunnel experiments to analyze pattern UAV. The CFD modeling nozzle was confirmed be feasible using experiments. Pearson correlation analysis performed between...

This study evaluates the applicability of Tropical Rain Measurement Mission (TRMM) 3B43V7 product for use throughout mainland China. Four statistical metrics were used based on observations made by rain gauges; these correlation coefficient (R), relative bias (RB), root mean square error (RMSE) and Nash-Sutcliffe efficiency (NSE), they chosen to evaluate performance at temporal spatial scales. The results revealed that performed satisfactorily all timescales (R > 0.9 NSE 0.86); however, it...

This study explores the drift potential characteristics of a flat fan nozzle. The atomization and fan-shaped pressure nozzles were studied at spraying height 0.6 m lateral wind speed 0–6 m/s through combination computational fluid dynamics (CFD) analyses tunnel experiments. nozzle Lu 120-03 had 0.3 MPa. results show that as varies from 0 to 6 m/s, spray droplet spectrum also changes, volume medium diameter increases. cumulative ratio spectral width M oscillate within certain ranges. amount...

Aerial application, a spraying method with aircraft as the application platform, is one of most important methods pest control in pine forests. This work aimed to investigate movement and distribution patterns droplets effectiveness helicopter on Masson (MP) Korean (KP) trees. In particular, three nozzle types (CP02, CP03 CP04) were evaluated compared at same spray volume rate (15 L ha-1 ) both wind tunnel field trials.The CP04 larger orifice size showed significantly better deposition...

The site-specific management of cotton fields is necessary for evaluating the growth status and generating a defoliation prescription map. traditional assessment method pests diseases based on spot surveys manual participation, which time-consuming, labor-intensive, lacks high-quality results. RGB multispectral images acquired by drones equipped with sensors provide possibility to quickly accurately obtain overall data field. In this study, we obtained remote sensing calculate spectral index...

The influences of the canopy height and spray volume on droplet distribution in upper bottom cotton were discussed this study. XAG P30 plant protection Unmanned Aerial Vehicle(UAV) was used as a tool water sensitive paper test card. volumes by UAV include 18.0 L/ha,22.5 L/ha, 30.0 L/ha. average planting heights areas are 0.5 m,0.7m, and1.1m, respectively. results show that droplets more well-distributed part rather than lower part. has significant effect canopy. coverage, deposition, density...

Abstract BACKGROUND In order to address the issues of uneven pesticide deposition and low utilization in rubber gardens caused by traditional diffuse plant protection spraying method, this study focuses on air‐assisted powder sprayer proposes a variable application control system. A decision‐making model integrating leaf area index (LAI) was designed based powdery mildew standards individual tree information. According target accuracy requirements, air velocity adjustment device established...

Gaofen-4 (GF-4) is the first high-resolution geostationary satellite of China, launched on December 29, 2015. Its visible-near infrared optical sensor capable imaging earth at 50 m resolution, covering a 512 km × area with minimum interval 20 s. More than 300 GF-4 images, taken in four sequences rates 36 and 69 s per scene, captured development Typhoon Megi-2016-from its peak afternoon September 26, 2016 to dispersion two days later 28. These consecutive images recorded motion field...

In order to illustrate the effects of droplet deposition on canopy and stem areca nut sprayed by multi-rotor Unmanned Aerial Vehicle (UAV), for providing operation parameter basis application aerial spray in Hainan Province. The MG-1p UAV different leaf area index (LAI) under heights nozzle types were mainly studied. Eight treatments carried out experiment. Instead pesticides, seduction red stain agent was selected prepared into an aqueous solution with a mass fraction 5‰, quantity 75 L/ha...

Spray drift has always been a focus research area in the field of unmanned aerial vehicle (UAV) application. Under fixed premises UAV operating parameters, such as height, speed and spraying liquid, droplet is mainly affected by meteorological conditions. In this research, spray deposition tests were conducted using QuanFeng120 pineapple under various different The experimental results showed that with changes height wind speed, start position in-swath changed 4 m extreme situation....

The tree peony (Paeonia ostii 'Feng Dan Bai') has excellent drought tolerance. Although it already been reported that the cuticle is an essential barrier against stress, critical genes for resistance to remain unclear. However, long-chain acyl-CoA synthetases (LACS) family of may be significant synthesis wax. To test whether LACS gene involved in response stress peony, we measure thickness stems and leaves alongside enzyme activity. It found thickens increases with maturation leaves, there a...

A general greening trend in the Arctic tundra biome has been indicated by satellite remote sensing data over recent decades. However, since 2011, there have signs of browning trends many parts region. Previous research on greenness across region relied satellite-derived normalized difference vegetation index (NDVI). In this research, we initially used spatially downscaled solar-induced fluorescence (SIF) to analyze spatiotemporal variation (2007–2013). The results derived from SIF were also...

In order to accurately explore the droplets distribution characteristics on ground and space during aerial spray process, a single-pass application test based determination of effective swath by Bell206L4 helicopter was carried out. The accurate width operation obtained, cumulative spatial drift droplet deposition when used different nozzles under natural environment were systematically analyzed. results showed that average three types nozzle 25.3 m (CP02), 29.7 (CP03) 29.3 (CP04) with an...

Banana oligosaccharides (BOS) were extracted with water, and then separated purified using column chromatography. Gel penetration chromatography was used to determine the molecular weights. Thin layer chromatogram capillary electrophoresis employed analyze monosaccharide composition. The indican bond structure of BOS molecule determined Fourier transform infrared spectroscopy nuclear magnetic resonance. Results showed that probably composed eight β-D-pyran glucose units linked 1→6 bonds....

Rotary atomizers are mainly used in agricultural manned aircrafts. Atomization characteristics at high speeds have been studied, but methods to measure the atomization efficiency not elucidated. The of rotary under high-speed airflow was investigated using an IEA-I wind tunnel experimental installation, AU5000 atomizer, and a laser diffraction particle size analyzer. Accordingly, model equation for measurements innovatively obtained. When flow rate, fan blade angle speed were as variables,...

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