Asparagus problem

I planted an asparagus bed several years ago. In previous years unusual events (wind storm, hail) kept me from making any judgments. But this year I have no excuses. The plants came up pretty well and I harvested some spears sparingly. All spring we've had plenty of moisture, but the green foliage on all the plants uniformly seems to be withering starting at the top and working downward. Right now the top 15 " of all the 4 foot tall plants appears completely dead. Does anyone have any ideas?
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josh wrote:

google is your friend. I searched on "asparagus yellowing" and got a ton of hits. This is one that might provide the answer you need. (It's possible the yellowing is a lack of N)
http://www.hort.purdue.edu/ext/asprhu.html
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Are you saying that you have let them go into fern stage already? Letting it go to fern so early in the season will only shorten the lifesapn of your asparagus crowns. You be harvesting ALL the spears when they are 8inches(or a little shorter)every day.Even the pencil thin ones.Once the weather gets very warm,stop harvesting and than let it go to fern stage. You will be able to tell its time to stop harvesting when the tips start to open up when they are around the right size to harvest.

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