I have used a product called "Spray n Grow" Micronutrients. There are a lot of proven documentation of the benefits of using a foliar spray. Some products need to have some type of wetting agent mixed in with them to make them ore readily available to the plants.
I have used a Kelp spray on a few stressed plants to see how they make out.
The problem can be that fertilization from the soil is not eliminated. The soil fertilization whether it be organic or chemical is required.
Rick
