The dry matter (DM) varied from 57.4 to 66.1%, implying that most of incorporated wastes were characterized by relatively low water content. The concentration of organic matter is within the range 20.3-27.9%. The contents of Ca and N varied respectively from 5.32 to 8.23% and 0.44 to 0.60%, whereas the concentrations of K, Mg and P exhibited values indicating that these amounts may be sufficient for supporting plant growth and further green biomass production, i.e: 1.63-1.98 % for K, 1.01-1.38 % for Mg, and 0.13-0.21 % for P. It should be pointed out that the reported concentrations deal with the vegetation of the so-called natural ecosystems, since its biological requirements for nutrients is low.
According to the linear correlation, the coefficients between the physical and chemical parameters of soil substitutes and theSinapis alba sproutings (Sin_alb, %) have revealed negative correlation with EC (r = -0.46). Water content (W), OM, pH, EC and concentration of other main chemical elements in soil substitutes: Ca, N, K, Mg, P, S and Na did not show correlation with Sinapis albagermination (Table 6) nor did the content of trace elements.
TABLE 6 Linear correlation between of physico-chemical parameters of soil substitutes and the Sinapis alba germination at the stage III