white daffodils

I have a question that a neighbour of mine posed. She has a large flower garden that has produced brilliant yellow daffodils for the last 15 years. This year they are all in flower but so pale as to be white, and naturally she's wondering why. Asking her what had been done to the garden recently she recalled a load of partially decomposed cattle manure from a neighbouring farm that was spread last year over the garden. I suspect that something in the manure has altered the bloom this year. Can you suggest what can be done to restore yellow daffodils next season, since I'm of the belief that the manure is responsible for having changed the soil in some way. Will rain and time be all that's required, or is there an anti-dote that can be applied to the garden to counter the perhaps overly active chemicals in the cattle manure?
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The normal colour should return next year. Pigmentation has a complex chemical basis and can be affected~~sometimes without obvious reason. Best Wishes.

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Is it possible your neighbor has 'Mt. Hood' daffodils? They open pale yellow but turn completely white when fully open. I found that 'Mt. Hood' is much more reliable in returning year after year than the conventional yellow 'King Alfred'.
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David E. Ross
<http://www.rossde.com/
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