For healthy asparagus, add sodium chloride rock salt (NaCI) to beds more than one year old. Apply 2.5 lbs. per 100' row either before spears appear or around July 4. This treatment prevents crown and root rot diseases caused by fusarium fungus and also improves overall growth. Don't use iodized table salt or rock salt made of calcium chloride (CaCI). Pickling salt is fine. (Rodale's All-New Encyclopedia of Organic Gardening).
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