Folia Horticulturae

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Neutralizing ability of dolomitic limestone of different grinds in greenhouse substrates

Zbigniew Strojny

Institute of Pomology and Floriculture
Pomologiczna 18, 96-100 Skierniewice, Poland

Dolomites derived from the Siewierz mine with particle sizes DI 0-3 mm, DII 0-0.2 mm, and DIII 0-0.04 mm at the rates 0, 5, 10, 15, 20, 30, 40, 50, 75, and 100 g/dm3 were compared with powdered lime in peat and a mix of peat, peat bark, and soil v/v 1:1:1. After liming, the substrates were incubated in plastic bags in greenhouse conditions. The pH was measured every week up to 8 weeks and then every month for another 3 months. The neutralizing power of the dolomites DII and DIII was similar to that of lime, but they worked slightly slower. Dolomite DI was unsatisfactory. For all the dolomites the pH rose rapidly during the first 2 weeks, then more slowly up to 6th week when it became stabilized. The pH rose with dolomite even with the very high doses - faster for peat than for the soil-based mix. In order to reach the pH suitable for most floriculture crops the use of dolomite DII at the rate of 5 g/dm3, 2 weeks before planting, would seem to be best.

Strojny Z., 1992. Neutralizing ability of dolomitic limestone of different grinds in greenhouse substrates. Folia Horticulturae IV/2: 25-34.