Our open-field microplot experiments were organized with giant reed from 2007 to 2011 in Nyíregyháza, Hungary. Micropropated (American „SC Blossom” culture) or rhizome propagated (Hungarian ornamental culture) plants were grown in a sandy loam brown forest soil. Two biowastes (municipal sewage sludge compost – MSSC or municipal biocompost – MBC from green waste), and ammonium nitrate (AN) fertiliser as a top dressing were applied to the soil to study their impacts on the yield and mineral nutrition of Arundo. It was found that even from high (51 dry t ha-1) provocative doses of MSSC the accumulation of toxic elements as Cd or Pb was negligible in the shoots of Arundo. If moderate dose (13 dry t ha-1) of MSSC was applied to the soil, the above-ground wet yield of the Hungarian culture was significantly enhanced, by 21%. Similar stimulation of yields was observed at the second harvest of shoots if the soil was treated before with 18.8 t ha-1 MBC+150 kg ha-1 AN or 300 kg ha-1 AN (with appr. 50 or 100 kg ha-1 nitrogen active substance) as a top dressing. The wet above-ground yields were enhanced by 19.8% or 9.0%, respectively. Treated cultures had more harvestable shoots; however, the weight of one shoot was lower than that of control. Soil application of MSSC or MBC enhanced the specific concentration of K, P, N or Zn in shoots. Accumulation of Cd was also slightly enhanced, but its total amount in shoots was negligible. It can be concluded that above-ground yields of Arundo can be stimulated with biowastes or by artificial nitrogen fertiliser, without the danger of excessive toxic element accumulation in combustible shoots.
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