as far as absorption;
anyone use
Yucca??
Yucca will help the water spread and not bead off the leafs, so you get more coverage.
I copied this from a good read about foliar
by Harley Smith
Yucca extract is a natural surfactant or wetting agent.
Yucca schidigera contains saponins, a soapy, steroidal-like substance that acts as a natural spreader/sticker for horticultural use. It only takes a little
yucca extract to be effective. As little as 1/16th teaspoon will treat over 5 gallons of water.
Yucca helps water and nutrients penetrate deeper into the root zone, and
yucca’s natural cleaning action helps keep drip emitter lines from clogging.