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Acidity and Sorption Properties of Zinc-Contaminated Soil Following the Application of Neutralising Substances

Wyszkowski M., Modrzewska B.

Journal of Ecological Engineering

2016

Vol. 17, nr 1

63--68

Soil plays the most important role in the cycling of elements in the terrestrial environment. Contamination of soil with heavy metals have effect on all soil organism and plants. For this reason, studies have been carried out to assess the possibility of neutralising the effect of zinc (0, 150, 300, 600 and 1200 mg Zn kg,-1 of soil) on soil properties by applying neutralising substances (compost, bentonite and zeolite). Soil acidity and sorption properties depended on zinc contamination and on the type of neutralising substances added. In the series without an addition of neutralising substances, increasing zinc soil contamination resulted in a decrease in total exchangeable bases, in cation exchange capacity and in the saturation degree of the degree of base saturation, and an increase in soil hydrolytic acidity. An addition of bentonite to zinc-contaminated soil had the most advantageous effect of all the additions of neutralising substances on the tested soil properties. It resulted in an increase in soil pH, in total exchangeable bases, in cation exchange capacity, in the degree of base saturation and simultaneously decreased soil hydrolytic acidity compared to the series without additions. Adding zeolite and compost to soil had a small and usually insignificant effect on soil acidity and soil sorption properties.

Effect of Zinc Ions on Biological Activity of Plant Pathogenic Fungi

Dłużniewska J., Nadolnik M.

Chemia i Inżynieria Ekologiczna

2002

Vol. 9, nr 4

355-359

The experiments were aimed to evaluate the effect of zinc ions on biological activity of pathogenic fungi in plants. The following fungi were selected for the studies: Alternaria alternata, Botrytis cinerea, Fusarium culmorum and Rhizoctonia solani. Linear growth rate and pathogenicity of the above-mentioned fungi were determined in pea seedlings. It was found that an increase in zinc concentration in the medium caused a decrease in linear growth rate in the studied fungi. Zinc ions at 1000 ppm strongly inhibited development of the pathogens. Zinc concentration of 3000 ppm completely blocked growth of all fungi. Tbe species R. solani were the most sensitive to zinc ions while B. cinerea showed the highest resistance.

W doświadczeniu oceniano wpływ jonów cynku na aktywność biologiczną grzybów chorobotwórczych dla roślin. Do badań wybrano następujące izolaty grzybów Alternaria alternata, Batrytis cinerea, Fusarium culmorum i Rhizoctonia solani. Określano tempo wzrostu liniowego i patogeniczność wymienionych grzybów w odniesieniu do siewek grochu. Stwierdzono, że wzrost stężenia cynku w podłożu powodował obniżenie tempa wzrostu liniowego badanych grzybów. Jony cynku w stężeniu 1000 i 3000 ppm wykazywały silne działanie inhibicyjne na rozwój patogenów. Najbardziej wrażliwy na jony cynku był gatunek R. saloni, a największą odporność wykazywał patogen B. cinerea.