Gyttja'nın toprakta enzim aktiviteleri ile kadmiyum kapsamı üzerine etkisi
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Date
2003
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Fen Bilimleri Enstitüsü
Abstract
In this study, the effects of different forms of Gyttja (coal gyttja-CG and humus gyttja-HG) and lignite (L). on some soil properties (a variety of soil enzymes, extractable Cd. pH, EC, lime and organic matter content) was evaluated within a 180 days incubation study in the laboratory. The Gyttja material was obtained from Afsin-Elbistan Lignite Mine Area located in Kahramanmaraş. The results showed that Urease and (5-glucosidasc activities were the highest when CG, HG and L were applied to soil in the rates of 4 and 8 %. Urease and P-glucosidasc activities were ranked in the order of CG > L > HG while sulphatase activity showed different rank as CG > HG > L. Similar to Urease, when CG was applied to soil in increasing rates, alkaline-phosphatase activity increased during first three months and then showed a decrease but it was found to be higher than that to be at the beginning of the incubation. HG and L addition to soil has enhanced alkaline-phosphatase activity at the end of the first month. Afterwards, it showed a decline through end of the incubation period. In the lights of these results. CG seems to be more effective on alkaline-phosphatase activity than those HG and L do. In the case of soil extractable Cd content, no change was seen in the amount of Cd in CG amended soil, whereas HG and L amended soils showed an increase in 90. days of incubation period. All amendments have caused to an increase in soil organic matter. The highest contribution to soil organic matter was obtained from L. which were followed by CG and HG respectively. While CG had no affect on lime content. HG led to a small increase and L reduced lime content, which may be due to the differences in the lime contents of organic materials used in the study. L amended soil showed highest EC value, which was higher than that in non-amended control soil for all different rates of L applied. The same situation was observed in the case of CG and HG with higher application rates (4 and 8 %). CG. HG and L caused to some changes in soil pH in accordance with their pH level. In the light of our results, coal gyttja seemed to be better alternative for agricultural use. Key Words: gyttja, lignite, soil enzyme activity, cadmium, pH. EC. organic matter, lime
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