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Use of Wastewater and Compost Extracts as Nutrient Sources for Growing Nursery and Turfgrass Species

^a Dep. of Land Resource Science, Univ. of Guelph, Guelph, ON, Canada, N1G 2W1
^b Dep. of Plant Agriculture, Univ. of Guelph, Guelph, ON, Canada, N1G 2W1
^c Super Blue Box Recycling Corporation (SUBBOR), Suite 401, 2275 Lakeshore Blvd. W., Etobicoke, ON, Canada, M8V 3Y3. Robert C. Michitsch, present address, Nova Scotia Agricultural College, c/o R. Michitsch, 20 Tower Rd., Truro, NS, Canada, B2N 5E3

View larger version (45K): [in this window] [in a new window]   Fig. 1. Top and root yields, and top/root ratio, for woody species. Treatments separated by Duncan's multiple range test at P = 0.05. Treatment abbreviations: Hoagland's half-strength #2 solution (HH); Plant Products (PP); anaerobic digestion wastewater (ADW); spent mushroom compost extract (SMC); MSW compost extract (GMC); amended to HH levels (-A).

View larger version (47K): [in this window] [in a new window]   Fig. 2. Clipping (third harvest only), root yields, and top/root ratio (i.e., third clipping harvest/root) for turfgrass species. Treatments separated by Duncan's multiple range test at P = 0.05. Treatment abbreviations: Hoagland's half-strength #2 solution (HH); Plant Products (PP); anaerobic digestion wastewater (SW); spent mushroom compost extract (SMC); MSW compost extract (GMC); amended to HH levels (-A).

View larger version (54K): [in this window] [in a new window]   Fig. 3. Fluctuations in pH for both woody and turfgrass species from a daily maintained level to 6.3 ± 0.1 units. Individual treatments are not separated. Unamended treatments exhibited the widest and most frequent fluctuation from 6.3 ± 0.1 units, especially following a 2 wk change of nutrient solution.