Rain and chlorosis

We've had a LOT of rain in the last week.

I came home to find that we need waders to the do laundry and that the squashes have very yellow leaves. It looks like drainage problems in the beds may ave caused iron chlorosis. I'll check for borers before I treat for iron, but poo.
We have zillions of baby butternuts, but only *two* zucchinis, and they're tiny!

(I thought I had planted three of each, but as they've grown up, it's become clear that there is one zucchini, four butternuts, and one odd duck plants that looks like a hybrid of them both.)

Anyway, I am going to try soft rock phospate and liquid calcium to see if I can get the iron back into balance so the plants can absorb it again. As soon as I figure out how to add the SRP in powder form to an already growing bed. (Can't dig it in, like I usually would, and I'm not sure a drench would be effective or the added water welcome.)