From your post it sounds like these plants are outside new transplants.
Did you harden them off before planting out?
What often happens is that the abrupt exposure to outside light and wind can cause either or both windburn and sunburn.
And both are characterized by white patches on the leaves, or even more widespread in the case if windburn.
I doubt that any mineral deficiencies are the cause.
If it's just wind and/or sunburn do nothing and new foliage will appear with time and all will be well.
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Carolyn
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