Brass tips are economical for limited use, but other types should be considered for more extensive use. The following chart can be used as a guide for selecting the proper nozzle type for most soybean spraying applications. Suggested application for various spray nozzles used in soybeans. By following the steps described below, the proper nozzle tip size can be selected well ahead of the spraying season. The best guides for this decision are the recommended ranges listed on the label, the recommendation of a chemical dealer or county agricultural agent, and experience with that particular chemical.
Experience is the best guide here.
Generally, speeds between three to 7 MPH are considered appropriate for low pressure ground sprayers depending upon field conditions. Do not rely solely on speedometers as an accurate measure of ground speed, especially on older tractors. Slippage and variation in tire sizes can result in speedometer errors of 30 percent or more. The use of 6,000 instead of 5,940 will make the calculation easier and result in an error of only one percent. By checking nozzle catalogs, you will find a number of different brands of flooding flat fan nozzles which will provide this flow rate.