An assessment has been done of the yielding of nine clones of energy willow planted in Kościernica near Koszalin on light soil of IVb-V class, fertilized with the compost from municipal sludge in the dose of 10 t.ha -1 of dry matter and with Hydrofoska 16 fertilizer in two doses (562.5 kg.ha-1 and 1.125 kg-ha-1). The highest content of dry matter in shoots was obtained on the objects without any fertilization. Fertilization with the compost decreased the content of dry matter in the shoots and increased the yield of fresh matter in comparison with the testing object without fertilization.
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