Growing substrates amended with raw or composed paper mill primary sludge
1999
Dubsky, M. | Sramek, F. (Vyzkumny Ustav Okrasneho Zahradnictvi, Pruhonice (Czech Republic))
Peat-bark growing substrates amended with 33.3 % vol. of paper mill primary sludge, raw or composted with decomposed bark (3 or 6 weeks), were tested in experiments with three pot flower species (Impatiens New Guinea, Dendranthema grandiflora, Kalanchoe blossfeldiana). All prepared substrates had suitable physical and chemical properties, the substrates with primary sludge were only higher in pH and in calcium content. Tested plant species did well in the substrates with composted primary sludge just as in the control substrate while in the substrate with raw primary sludge growth retardation and nutrient deficiency symptom (Impatiens) were observed. The experiments with all three species proved the possibility of using paper mill primary sludge as a substrate component at the amount of 33.3 % vol. after its composting with decomposed bark for at least three weeks.
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