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The paper discusses the long-term effect of hard coal fly ashes on the content of some nitrogen forms in soil. The study was based on a field experiment 19 years after it had becn established. Fly ashes were dosed at rates of O, 100, 200, 400, 600 and 800 Mg ha-1, in the following four series: without organic substance, with farmyard manure, with straw and with trec bark. The results seem to prove...
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