Good article which also applies to Tennessee producers.

Author: Arkansas Row Crops
By Nathan Slaton, Rick Norman, Trent Roberts, Jason Kelley, Jarrod Hardke, Bill Robertson, Jeremy Ross and Leo Espinoza; University of Arkansas System Division of Agriculture.

Farmers must ask at least two fundamental questions about every product they are asked to purchase and apply to their crop: What is the frequency of crop response and what is the average yield increase? The answers to these two questions should be based on an adequate amount of unbiased, reputable research. With such a large number of crop yield enhancing products and nutrient solutions formulated for foliar application available there is no way that each product can be thoroughly researched by university scientists. For the record, let’s establish that there is not a university scientist alive that does not want to discover or recommend farming practices and products that enhance grower yields and profits. Continue reading at Arkansas Row Crops.