pros & cons to both for sure. if cost of both products are relatively equal, then liquid will be a better route from a agronomic standpoint. dry Phos will never all become available to the plant as a % of rock Phos will never convert to plant use, whereas Liquid P is 100% available from the time it hits the dirt as is also the case with the K in a liquid form. that and if really dry at planting, the dry may take a few days to become available where again the Liquid is ready to go to work right then.
If you are interested, our dry micro program can be easily added right in the hopper with no equipment retrofit required. Blend contains some talc for flowability so no additional talc required. (Kinze planters work best with 1oz graphite added every other fill) Cost is $232.00 delivered for 25# (400oz) bucket and uses 4oz/50# bag of seed for corn, 2oz/50# soybeans, 2oz/50# forage crops. The "2x2" recommendation is to prevent burning of tap root with traditional in furrow liquid starter. Our powder that is added to the seed has no leaching or burning problems.
The micro-blend suggested above is a blend of sulfur, boron, cobalt, copper, iron, manganese, molybdenum, zinc, and a little nitrogen, phosphorus and potassium. Designed to supplement a best practices NPK program. For wheat will require 3.5 oz/100lbs of seed (a little goes a long way) and trials have shown to increase yield from control (untreated) ave 77.5 bu/acre to 82.5 bu/acre for treated (5 bu/acre increase).
The photo above shows a field with an untreated strip.
ooo ok it's a micro nutrients product like quick roots.... interesting.