On-Farm Evaluation of Prescription Map-Based Variable Rate Application of Pesticides in Vineyards

Campos, Javier Clavero; Gallart, Montserrat; Casamada, Jordi Llop; Ortega, Paula; Salcedo, Ramón; Gil, Emilio

doi:10.20944/preprints201911.0306.v1

Cited by 4 publications

(6 citation statements)

References 21 publications

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“…This approach showed how satellite imagery is unusable for crops grown in rows, for crop canopies which do not extend to the whole surface, or where the presence of weeds is significant. Campos et al [ 99 ] designed a procedure for a variable rate application (VRA) sprayer. An unmanned aerial vehicle, equipped with a multispectral camera, was used to generate a photo set for the canopy characterization throughout the entire growing season in four vineyard plots.…”

Section: Unmanned Aerial Systems (Uass) Application In Viticulturamentioning

confidence: 99%

Advances in Unmanned Aerial System Remote Sensing for Precision Viticulture

Sassu

Gambella

Ghiani

et al. 2021

Sensors

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New technologies for management, monitoring, and control of spatio-temporal crop variability in precision viticulture scenarios are numerous. Remote sensing relies on sensors able to provide useful data for the improvement of management efficiency and the optimization of inputs. unmanned aerial systems (UASs) are the newest and most versatile tools, characterized by high precision and accuracy, flexibility, and low operating costs. The work aims at providing a complete overview of the application of UASs in precision viticulture, focusing on the different application purposes, the applied equipment, the potential of technologies combined with UASs for identifying vineyards’ variability. The review discusses the potential of UASs in viticulture by distinguishing five areas of application: rows segmentation and crop features detection techniques; vineyard variability monitoring; estimation of row area and volume; disease detection; vigor and prescription maps creation. Technological innovation and low purchase costs make UASs the core tools for decision support in the customary use by winegrowers. The ability of the systems to respond to the current demands for the acquisition of digital technologies in agricultural fields makes UASs a candidate to play an increasingly important role in future scenarios of viticulture application.

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Section: Unmanned Aerial Systems (Uass) Application In Viticulturamentioning

confidence: 99%

Advances in Unmanned Aerial System Remote Sensing for Precision Viticulture

Sassu

Gambella

Ghiani

et al. 2021

Sensors

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“…A low leaf density allows the droplets to pass through the canopy, thus not being deposited on the leaves, what also hinders the target coverage. Similarly, Campos et al (2020) found that higher vegetative volumes increase the deposition of droplets along the canopy.…”

Section: Resultsmentioning

confidence: 87%

“…On average, the electrostatic application results in a 38.0 % higher deposition rate than the hydropneumatic application in the upper third of the plant. Sasaki et al (2013) and Salcedo et al (2020) * Significant at 0.05; ns non-significant at 0.05. Spray technology for deposition of droplets on coffee leaves and fruits observed similar values, but for the entire plant.…”

Section: Resultsmentioning

confidence: 99%

“…Souza Júnior et al (2017) did not identify any differences in the deposition in coffee crops at different application rates. It is likely that, as stated by Salcedo et al (2020), differences in the leaf densities or plant architectures are the primary factors affecting the deposition along the canopy.…”

Section: Resultsmentioning

confidence: 99%

“…The application technology widely used to obtain fine and very fine droplets is based on conventional hydropneumatic sprays (Crause et al 2020, Melo et al 2020. The installation of an electrostatic kit allows the spray to be charged with electrons through a charge induction system, which generates an electric field and attracts the droplets to the leaf surface, potentially increasing the leaf deposition (Salcedo et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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Spray technology for deposition of droplets on coffee leaves and fruits1

Zampiróli

Alvarenga

Parenti

et al. 2021

Pesqui. Agropecu. Trop.

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The correct deposition of spray along the canopy is important for the phytosanitary control in coffee plants; however, the structure of the plant makes this distribution difficult. This study aimed to evaluate the deposition of a tracer on leaves and fruits in coffee cultivation, with respect to the application rate and type of hydraulic nozzle, as well as the use of an electrostatic spraying system. A hydropneumatic sprayer was used, with hydraulic nozzles of empty conical jet of the series TVI (coarse droplets with air induction) or JA (fine droplets), at rates of 200 and 400 L ha-1. An electrostatic system, with SPE-2 nozzle and rate of 200 L ha-1, was also evaluated. The deposition of the tracer on leaves and fruits of the upper, middle and lower thirds of the trees, as well as the losses to the ground in the canopy projection, were quantified using spectrophotometry. The results indicated that the electrostatic application provides a greater deposition on leaves of the upper third than the hydropneumatic application, regardless of the application rate. The use of the TVI nozzle results in a greater deposition on the fruits of the middle third and a greater loss to the ground than the JA nozzle. Although an application rate of 400 L ha-1 results in a greater deposition on the fruits of the middle third than an application rate of 200 L ha-1, it also causes a greater loss to the ground.

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Field assessment of a pulse width modulation (PWM) spray system applying different spray volumes: duty cycle and forward speed effects on vines spray coverage

et al. 2021

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The pulse width modulation (PWM) spray system is the most advanced technology to obtain variable rate spray application without varying the operative sprayer parameters (e.g. spray pressure, nozzle size). According to the precision agriculture principles, PWM is the prime technology that allows to spray the required amount where needed without varying the droplet size spectra which benefits both the uniformity of spray quality and the spray drift reduction. However, some concerns related to the effect of on–off solenoid valves and the alternating on/off action of adjacent nozzles on final uneven spray coverage (SC) have arisen. Further evaluations of PWM systems used for spraying 3D crops under field conditions are welcomed. A tower-shaped airblast sprayer equipped with a PWM was tested in a vineyard. Twelve configurations, combining duty cycles (DC: 30, 50, 70, 100%) and forward speeds (FS: 4, 6, 8 km h−1), were tested. Two methodologies, namely field-standardized and real field conditions, were adopted to evaluate the effect of DC and FS on (1) SC variability (CV%) along both the sprayer travel direction and the vertical spray profile using long water sensitive papers (WSP), and (2) SC uniformity (IU, index value) within the canopy at different depths and heights, respectively. Furthermore, the SC (%) and deposit density (Nst, no stains cm−2), determined using short WSP, were used to evaluate the spray application performances taking into account the spray volumes applied. Under field-controlled conditions, the pulsing of the PWM system affects both the SC variability measured along the sprayer travel direction and along the vertical spray profile. In contrast, under real field conditions, the PWM system does not affect the uniformity of SC measured within the canopy. The relationship between SC and Nst allowed identification of the ranges of 200–250 and 300–370 l ha−1 as the most suitable spray volumes to be applied for insecticide and fungicide plant protection products, respectively.

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On-Farm Evaluation of Prescription Map-Based Variable Rate Application of Pesticides in Vineyards

Cited by 4 publications

References 21 publications

Advances in Unmanned Aerial System Remote Sensing for Precision Viticulture

Advances in Unmanned Aerial System Remote Sensing for Precision Viticulture

Spray technology for deposition of droplets on coffee leaves and fruits1

Field assessment of a pulse width modulation (PWM) spray system applying different spray volumes: duty cycle and forward speed effects on vines spray coverage

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