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In order to estimate the effect of granulated sewage sludge on the productivity of the cup plant (Silphium perfoliatum L.), soil physical and microbial properties, a field experiment was carried out in Western Lithuania, on a naturally acid moraine loam Bathygleyic Dystric Glossic Retisol with a pH of 4.3–4.9. The dry matter yield of the cup plant consistently increased over the experimental years from 2.83 t ha-1 (in 2013) to 12.86 t ha-1 (in 2016). Each year, the optimum sewage sludge rate for dry matter yield of cup plant was 45 t ha-1. The use of both sewage sludge rates 45 and 90 t ha-1 had a similar and positive impact on soil chemical composition, water-stable aggregate formation, topsoil bulk density, soil penetration resistance and moisture content. Each experimental year, the application of sewage sludge at a rate of 90 t ha-1 had the strongest impact on the increase in soil microbial biomass carbon at the 0–30 cm depth. Experimental results suggest that when growing cup plant as an energy crop on a moraine loam Retisol, it is expedient to use granulated sewage sludge at a rate of 45 t ha-1.

Assessment of a single application of sewage sludge on the biomass yield of Silphium perfoliatum and changes in naturally acid soil properties