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The aim of the study was to determine the effect of liming and applying varied doses of sludge (10, 20 and 40 % of fresh mass relative to the weight of soil in a pot) on the content of nitrogen and carbon in plants and in soil, in a four-year pot experiment. Italian ryegrass (Lolium multiflorum) was used as the test plant in the first year, maize and silage sunflower in the second and third years...
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