Nitrogen and Potassium Nutrition of Geraniums Grown in Spent Mushroom Substrate (SMS) Fertilized with Leachate from SMS
E. J. Holcomb, Charles W. Heuser and Paul H. Heinemann
Spent mushroom substrate (SMS) can effectively be used for the production of greenhouse and nursery crops. Young et al. (2002) demonstrated that marigolds could be grown in SMS from three sources. In this research the procedure was to take the fresh SMS and leach the soluble salts from the SMS then use the SMS immediately as a growing media amendment. The problem with this procedure was that a waste product containing high salt content was generated. Many of the salts in the SMS leachate are plant nutrients and could be supplied to the plant as a replacement for existing fertilizer nutrients. A preliminary study determined that marigolds could be grown using the SMS leachate as the primary source for fertilizer nutrients.
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