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How do you use a backpack sprayer?
How to use a backpack sprayer?

Written by Frank Schoenmakers | Last update: 04-12-2020
A backpack sprayer is often used in horticulture to spray smaller surfaces and hard-to-reach places. Using the right amount of water and agent is important for an optimal result. In this article, our specialist explains how to use a backpack sprayer and how to calculate the right amount of spray liquid.
The operation of a backpack sprayer
Most backpack sprayers feature a pressure vessel. This provides constant pressure, ensuring the liquid is sprayed evenly. Some backpack sprayers are equipped with a pressure gauge on the valve, which indicates the spray pressure. A constant pressure is important for a uniform spray pattern.
Choosing a nozzle
You can mount a nozzle on the spray lance of a backpack sprayer. There are different types of nozzles, each of which is suitable for a different application. It is important to choose the right nozzle to obtain the best possible result.
Calculate amount of spray liquid
There are two methods to calculate the right amount of spray liquid of a backpack sprayer:
1. Dosage according to directions on the label.
2. Dosage according to a solution concentration.
Dosage according to the label when using a backpack sprayer
This is particularly suitable for spraying on the ground or on low crops.
Step 1 - Calculate the amount of water and agent for the surface area to be sprayed
Example: you want to spray a part of the crop with a backpack sprayer. This is 150 x 3 meters. The surface area is 450 m². The label indicates 5 liters of agent per hectare with 200 liters of water.
So for this area, you need:
- Water: (450:10,000) x 200 = 9 L
- Agent: (450:10,000) x 5 = 0.225 L = 225 ml
Step 2 - Determine the nozzle release
The cap release is the amount of spray liquid the nozzle releases per minute at a certain pressure. You can find it in the nozzle table.
Step 3 - Determine the spray width
The spray width is the number of centimeters of which the agent hits 100% of the sprayable surface. After all, more spray liquid ends up right below the nozzle than on the sides. That is why you must overlap, so that the same amount of spray liquid is dosed throughout. The entire width the nozzle covers is called the operating width.
In order to see the spray width of a nozzle, it is best to spray on a paved area, such as on the concrete path.
Note: make sure you always keep the nozzle about 50 centimeters above the ground. This not only works pleasantly, but also provides the best result.