Let me begin by admitting that I know nothing about farming in South Carolina and I don't want you to get the impression that I'm telling you what to do on your own farm. With that said here's my train of thought. A typical pasture fertilizer(25% legume/75% grass) for KY is a N-P-K of 60-40-40. In rounded numbers that would be 100lbs of Urea, 90lbs of DAP, and 70lbs of Potash. How many gallons of liquid fertilizer do need to apply to reach those levels of units of N-P-K? There are a great many liquid starter fertilizers available for corn/tobacco and other crops but they are used to start the crop by being placed in the row(or near it). They are used in conjunction with a broadcast preplant application of dry fertilizer. There are foliar fertilizers on the market that mix well with herbicides and we have used them extensively. They work very well as a micronutrient "fix" to a already existing crop. Usually when zinc, boron, sulfur, magnesium, iron, copper etc deficiences exit. We have used foliar to provide P-K to a stressed crop, from weather, insects, herbicide burn, etc where P-K is deficient but only as a "patch" to get to harvest were the problem can be corrected with a dry application. Liquid nitrogen either 28% or 32% is very workable in crops that need extra or multipe applications of N after planting. But few herbicides mix liquid N and it is not foliar applied but dropped between rows. Consider how many gallons of liquid fertilizer will need to be applied to provide the levels of NPK needed for the crop and consider that most herbicides, insecticides, fungicides are applied using 10-15 gallons of water per acre. Can you get the two to match up?