Spray nozzles are found on all types of sprayers as they are responsible for transforming the flow from the tank into fine mist, which is crucial for even distribution over the target area. There are various types of nozzles, each serving different functions, primarily: flow rate, distribution, and droplet size. These three functions need to be aligned with the application’s goal so that the sprayed product reaches the target effectively, leading to an efficient outcome as initially intended.
Using the correct nozzle is essential, but there’s another crucial aspect that also needs frequent checking: the calibration of the correct nozzle already on your sprayer. Nozzles in sprayers have a limited lifespan. Over time and with repeated use, they can wear out or even become clogged, as various products can accumulate and cause chemical clogging. A nozzle with a flow rate that is too high or too low can cause uneven application, dispersing products inconsistently along the boom. This can lead to phytotoxicity in the crop or even fail to meet the application’s goal if applying less than necessary. In addition to other problems, such as weed resistance when dealing with herbicides.
Spray nozzles do not have a perfectly defined lifespan; some may last 700 hours, others 1000, depending on how the nozzle was used. A key factor affecting durability is the material of the nozzle. For example, ceramic nozzles tend to last longer than plastic ones.
There are various ways to calibrate nozzles. Today, there are devices that make this simple and quick. There are also several companies that offer this service for free, aiming to open doors for future negotiations. However, a simple method is to use collectors such as buckets, or even flow test bags, which are inexpensive and easy to handle. With collectors, it’s possible to calculate the amount of fluid that exits the spray nozzle over a specific period.
When using bags, you can follow some simple steps:
✓ Place the bag on the nozzle holder and ensure that the nozzle tip is inside the bag;
✓ Set the working pressure on the sprayer;
✓ Spray with water for 1 minute;
✓ Weigh each bag (1kg = 1L of water);
It is recommended to clean the sprayer before calibration to avoid any contact with chemicals. After following these steps, you can analyze which nozzles are spraying more or less than ideal. For this, you will need the calibrated nozzle chart to find the ideal volume for the nozzle at the used pressure. The bags also provide a clear view on the boom itself, making it easier to see the uniformity of the application.
I hope I have helped improve the quality of your application. Don’t forget your PPE! Best regards.
