Abstract
In a field experiment, the ecochemical effects of soil amelioration withdolomite, phonolite rock powder and fertilization with potassium sulfate werecompared. By dolomite and phonolite the acid-neutralizing capacity of the soiland the pH level should be stabilized. In addition, the correction of a latentpotassium deficiency in spruce stands at acidified glacial loams was intended.In comparison to fertilizing with potassium sulfate liming as well as theapplication of phonolite rock powder showed a prominent improvement of the soilchemical status already within the first 4–5 years. Both treatmentsincreased the base saturation, the dolomite to a depth of 60 cm,the phonolite to a depth of 30 cm. At the limed plot, strongnitrate leaching occurred with peaks at 80 cm soil depth higherthan the EU threshold for drinking water. In the phonolite plot this alsooccurred, but the nitrate concentrations remained lower. The silicate rockpowder reacted more slowly than dolomite. Thus, we can state that silicate rockpowder can be an alternative to conventional liming in regions where the risk ofnitrate mobilization is high and especially at water preservation areas wherespecial care has to be observed. But the phonolite which was used in thisexperiment released a considerable amount of sodium, which disturbed theamelioration effect. In practice, it would be better to use a silicate rockpowder with a low sodium content. Fertilization with potassium sulfate provideda fast nutritional effect but displayed no potential for soil chemicalamelioration.
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von Wilpert, K., Lukes, M. Ecochemical effects of phonolite rock powder, dolomite and potassium sulfate in a spruce stand on an acidified glacial loam. Nutrient Cycling in Agroecosystems 65, 115–127 (2003). https://doi.org/10.1023/A:1022103325310
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DOI: https://doi.org/10.1023/A:1022103325310