An example of selling is the Hefty Brothers.  They spout off all the add-ins that are
really going to make your crop.  Most products like biologicals are high margin profit
for retailers. 

Every dollar has to be carefully spent, and with most treatments in the $5 -$15.00 range
per acre this soon adds up to real money.  Farming is a gamble every year as we all know.
Don't bet the farm on it.

Next up, we can talk about special spray adjuvants, micronutrient mixes,
or high priced ortho-phosphate liquid fertilizers vs. polyphosphate fertilizers.  
There is no difference in plant uptake with either one.  That means buy your
P fertilizers on a cost per pound basis.