What spraying method is most appropriate when a spray boom cannot be used, requiring a wide application width?

The most appropriate spraying method when a spray boom cannot be used and a wide application width is required is the broadcast method. This technique is designed for covering large areas efficiently, making it suitable for situations where precision application using a boom is not feasible.

Broadcast spraying disperses pesticides over a wide area uniformly. It allows applicators to cover extensive fields without the need for complex setups associated with boom sprayers, which are typically limited in flexibility and may not reach areas where the terrain or other obstacles hinder their operation.

The other methods, while useful in specific contexts, do not provide the same level of coverage or efficiency over wide areas. For example, the disc-core method is more targeted and suited for smaller applications, while cone and even spray methods tend to be more specialized, focusing on achieving specific spray patterns rather than maximizing coverage for large applications. This makes the broadcast method the most versatile and effective choice in circumstances requiring broad coverage without the use of a spray boom.