I have flown frost patrol over avocado plantations in California - cold and boring work and to be honest not something I really miss doing!
I was talking with a guy just now who farms vegetables in Washington State. His neighbour grows 1000 acres of cherries and uses a 212 to dry them with.
In order to increase the downwash they load it up with sandbags. After it rains the water collects where the stem joins onto the cherry. As the sun comes out and warms them up it splits the crop, rendering them unmarketable. They sell them for about $2-3 per pound.($5500 per ton)