Effects of fan speed on spray deposition and drift for targeting air-assisted sprayer in pear orchard (2024)

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Effects of fan speed on spray deposition and drift for targeting air-assisted sprayer in pear orchard (2024)

FAQs

What are the factors affecting drift in sprayer? ›

Several factors can influence spray drift in aerial applications, such as wind speed, spray solution, flight speed, flight height, boom setup, nozzle selection, spray pressure, deflection angle, and distance from the boom sprayer to the target [10].

How to reduce spray drift? ›

How to Prevent Spray Drift
  1. check the weather forecast before starting off; do not spray if the wind direction and speed would cause spray to drift onto sensitive areas.
  2. keep the spray boom as low as possible, consistent with an even spray pattern at the correct target height.
Aug 23, 2021

What two factors are most important in reducing spray drift? ›

Wind speed and wind direction are the No. 1 factor to influence drift, over and above everything else. He noted that when the wind speed doubles, there is a 700% increase in drift when readings are taking 90 feet downwind from the sprayer.

What problems are associated with spray drift? ›

Spray drift not only result in wasting expensive pesticides and pollution of the environment, it may damage non-target crops nearby, and poses a serious health risk to people living in areas where drift is occurring.

What wind speed is needed for spray drift? ›

Avoid spraying under still conditions. Ideal safe wind speed is 3-10 km/h, a light breeze. (Leaves and twigs are in constant motion.) 11-14 km/h (a moderate breeze) is suitable for spraying if using low drift nozzles or higher volume application, say 80-120 L/ha.

What wind speed is ideal for spraying? ›

Table 1: Beaufort scale and pesticide spraying conditions
Beaufort numberWind speedSpray notes
0<1km r=""> <1 knot="">Avoid fine sprays, especially on warm, sunny days
11–5 km/hr 1–3 knots
26–11 km/hr 4–6 knotsIdeal spraying conditions
312–19 km/hr 7–10 knots
7 more rows
Nov 3, 2021

What is a good applicator strategy to reduce pesticide spray drift? ›

The most effective way to reduce spray drift potential is to apply coarser sprays that minimize the number of droplets less than 150 µm. Droplet size can be varied through nozzle and spray pressure selection. Pressure: For any nozzle, lower pressures result in coarser sprays.

What are the factors that cause pesticide drift? ›

Spray Characteristics
  • Understanding Droplet Size. The overwhelming factor influencing drift is droplet size. ...
  • Pesticide Formulation. The viscosity, or thickness, of the liquid affects droplet size. ...
  • Drift Retardants. ...
  • Wind Speed. ...
  • Wind Direction. ...
  • Air Temperature and Relative Humidity. ...
  • Temperature Inversions. ...
  • Nozzle Selection.

What influences drift? ›

Particle drift occurs when spray droplets physically move away from the target site during application. The main causes of particle drift are: environmental factors: wind speed above 10 mph, low humidity, or high temperature. improper spray practices.

What two factors are most important in relation to vapor drift? ›

Which two factors are most important in avoiding vapor drift? Temperature and pesticide volatility.

How does spray drift occur? ›

Sprayed herbicides can drift as droplets, as vapours, as particles, or all of these. Droplet drift is the easiest to control because under good spraying conditions, droplets are carried down by air turbulence and gravity, to collect on plant or soil surfaces.

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