Another product designed to push vegetative development, 34-4-4-4S is used to supplement nitrogen just a little.  It should not be considered as part of the total bulk nitrogen application due to the cost, but when either weather has leached a significant portion of your nitrogen from the root zone, or late in the season when you need slightly more N to finish the crop off, then 34-4-4-4S is a good choice.  It is commonly used on corn, sorghum or other grains, but can be a good drip line product for produce.  The 4% sulfur also aids with the production of true protein in many feed crops, and the trace mineral package will also ensure high feeding quality.