Gloves, protective suits, rubber boots, and a properly fit respirator are important considerations when working with all chemcials.
There is a tendency to relax ones precautions when dealing with some of the newer "natural" products. One should keep in mind, however, that some nematicides once considered safe enough for homeowner use are no longer registered because of revised safety considerations. Also, even if a product is not directly toxic, the possibility of allergic reactions should be considered.
Often during the time that a field trial is being established, farm equipment will be operating in the same field, or may even be taking part in applications. One should always be aware of the location of such equipment because it is possible that the operator cannot see or hear you.
If there is a breeze at the time of application, arrange the order in which products are applied so that you will be working upwind as you move across the field. Stand upwind of any equipment that is applying a product.
Growers are almost always accompanied by dogs. Learn the names of the dogs (even record them on your data sheet) and make friends with them. For the dogs safety, inform the grower if they should be kept out of the field trial area and for how long.
If irrigation is used to incorporate a product, be certain that workers entering a treated area to adjust the system wear proper protective clothing.