EFFECT OF VARIOUS SOIL AMENDMENTS ON THE MINERAL NUTRITION OF SALIX VIMINALIS AND ARUNDO DONAX ENERGY CROPS
Basket willow (Salix viminalis L., cv. Inger) and giant reed (Arundo donax L.) energy crops were grown in open-field experiments. The brown forest soil (loamy sand texture, pHKCl 7.5, humus 1.5%, CEC 10.4 cmolc/kg; As-38.3, Cd-0.11, Cu-12.7, Pb-13.6, Zn-44.3 mg/kg in HNO3/H2O2 extract) was treated with artificial fertilizer and various soil amendments (ammonium nitrate-AN: 100, 150, 300 kg/ha; municipal sewage sludge compost-MSSC: 15, 25 t/ha; municipal biocompost-MBC: 20, 25 t/ha; willow bioash-WB: 600 kg/ha), and with their combination in 4 or 3 replications. Three months later, in the leaves of treated Salix cultures (except WB application) 9.8-23.5% more N was detected than in untreated controls. Most of the treatments enhanced the uptake of K, but concentration of P, Mg, Ca, Fe and Zn in leaves was reduced. Highest As concentrations (1.92-2.11 mg/g) were found in WB-treated cultures. Cd concentration in treated leaves (0.34-0.57 mg/g) was lower than in controls (0.99 mg/g), while Pb concentrations were under the detection limit. Eighteen weeks after first soil treatments with AN, MBC or MSSC mostly MSSC application influenced the accumulation of macro- and micronutrients in the leaves of Arundo, however the observed changes were statistically not significant. Concentrations of toxic Cd and Pb were under the detection limits in all treatments. In spite of the repeated soil application of AN, MBC or MSSC, thirty four weeks later statistically significant changes were not observed in the uptake or accumulation most of the elements (including toxic Cd and Pb) in giant reed shoots.
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