Abstract BACKGROUND Unmanned aerial vehicles (UAVs) are a recently developed spraying technology. However, the effect of spray volume variation on deposition and pesticide control efficacy is unknown. The three UAV volumes (9.0, 16.8 28.1 L ha −1 ) using different nozzle sizes droplet wheat aphid powdery mildew was assessed. An electric air‐pressure knapsack (EAP) sprayer used as comparison. RESULTS Different significantly influenced EAP. For UAV, low 9.0 with fine (nozzle LU120‐01) resulted...

As a new low volume application technology, unmanned aerial vehicle (UAV) is developing quickly in China. The aim of this study was to compare the droplet deposition, control efficacy and working efficiency six-rotor UAV with self-propelled boom sprayer two conventional knapsack sprayers on wheat crop. total deposition other were not statistically significant, but significantly lower for run-off. uniformity droplets penetrability poor. variation coefficient 87.2%, which higher than 31.2%....

Crop yield prediction is of great practical significance for farmers to make reasonable decisions, such as decisions on crop insurance, storage demand, cash flow budget, fertilizer, water and other input factors. The traditional measurement method sampling surveys, which require a large area destructive cotton fields consume considerable time labor costs. This study established estimation model based series Unmanned Aerial Vehicle (UAV) remote sensing data. U-Net semantic segmentation...

Previous studies have confirmed that choosing nozzles produce coarser droplets could reduce the risk of pesticide spray drift, but this conclusion is based on a large volume application, and it easy to ignore how impacts control effect. The difference from conventional carrier Unmanned Aerial Vehicle (UAV) very limited. Little was known about choose suitable with UAV’s limited ensure appropriate pest control. Droplet deposition addition adjuvant LU110-010, LU110-015, LU110-020 planthoppers...

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...

Coffee production and marketing is one of the main global commercial activities, but crop yields depend on several factors, among which plant health. The objective this study was to evaluate efficiency spray droplet deposition in coffee crops grown a mountain region, associated efficacy control fungal diseases. application efficiency, using an unmanned aerial vehicle (UAV), products applied were tested. Water-sensitive paper tags used analyze efficiency; agronomic vegetative vigor, yield,...

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 use of remotely piloted aircrafts (RPAs) for foliar application pesticides and fertilizers has increased worldwide in several agricultural crops. However, there is little information on the efficiency factors connected to spraying quality RPAs forestry, mainly eradication eucalyptus sprouts. objective this work was evaluate droplet distribution deposition sprouts risk exposure applicators using an RPA (DJI AGRAS T40) at different theoretical ranges (7.0, 9.0, 11.0 m) sizes (150, 300,...

Papaya production and export is increasingly expanding in the world market due to nutritional importance of fruit. Phytosanitary issues, labor shortages, unevenness land-based costal motorized applications compromise crops, environment, humankind. The purpose this study was evaluate efficiency droplet distribution using an unmanned aerial vehicle, with different application rates (12.0, 15.0, 18.0 L ha−1) spray nozzles (XR110015 MGA015) upper (UL), middle (ML), lower (LL) layers, on papaya...

Under China's goal of carbon neutrality, there is a huge demand for dioxide (CO2) capture, utilization, and storage technology (CCUS). CO2 transport, as crucial link in the CCUS industrial chain, will inevitably rely on construction long-distance pipelines infrastructure. Due to late start small scale pipeline construction, relative lag related technologies policies, it urgent make systematical planning achieve relevant technological breakthroughs future network public Therefore, three-stage...

Automatic acquisition of the canopy volume parameters Citrus reticulate Blanco cv. Shatangju tree is great significance to precision management orchard. This research combined point cloud deep learning algorithm with calculation segment trees. The 3D (Three-Dimensional) model a orchard was generated using UAV tilt photogrammetry images. segmentation effects three models, PointNet++, MinkowskiNet and FPConv, on trees ground were compared. following algorithms: convex hull by slices,...

Anomalies as misalignment, microcrack are inevitable for large diameter high strength steel pipelines. To ensure the strain capacity of mismatched welding joint with misalignments D 1,422 mm X80 pipeline, a comprehensive study via wide plate experiments and finite element model simulations was conducted. The full-scale tensile experiment pipe weld Strain distributions on derived by DIC technic. Trends CMOD at precrack in strains monitored. A FE established to inverse prove accuracy numerical...

Chemical application using unmanned aerial vehicles (UAVs) has received significant attention from researchers and the market in recent years. The concept of drones for collaborative spraying was proposed by manufacturers improving intelligence work efficiency. However, chemical is a professional technology which quality main concern. Using to achieve multi-unmanned vehicle formation evaluating effect not yet been reported. In this study, an indoor test platform two UAVs field experiments...

The yield of coffee plants depends on several factors, and the leaf nutrition is one most important. form application fertilizers used expensive considering efficacy adherence absorption nutrients. objective this work was to evaluate effect configurations operational parameters centrifugal nozzle rotation height in Conilon plants. coverage, density, deposition spray droplets were evaluated through water-sensitive paper tags artificial targets. macronutrients applied confirmed analyses at 15...

Spider mites are important pests that cause severe economic damage to cotton. They feed on underside of leaves, piercing the chloroplast-containing cells, resulting in foliar and yield reduction. This paper proposed a two-stage classification approach for mite-infestation detection based machine learning methods. Two cotton fields were selected study, UAV imagery collection concurrent ground investigation conducted July 20-21th, 2017. Mosaicking geo-registration performed collected...